| Suppression of Stimulated Brillouin Scattering in Optical Fibers Using a Linearly Chirped Diode Laser |
02 Jul 2012 |
11 pages |
| Authors:
J O White; A Vasilyev; J P Cahill; N Satyan; O Okusaga; G Rakuljic; C E Mungan; A Yariv; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
 | The output of high power fiber amplifiers is typically limited by stimulated Brillouin scattering (SBS). An analysis of SBS with a chirped pump laser indicates that a chirp of 2.5 x 10 to the 15th power Hz/s could raise, by an order of magnitude, the SBS threshold of a 20-m fiber. A diode laser with a constant output power and a linear chirp of 5 x 10 to the 15th ... |
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| An Octave Bandwidth, High PAE, Linear, Class J GaN High Power Amplifier |
12 Mar 2012 |
6 pages |
| Authors:
Kris Skowronski; Steve Nelson; Rajesh Mongia; Howard Sheehan; Sid Anderson; COBHAM RICHARDSON TX SENSOR SYSTEMS
|
| In this paper, the design and measured performance of a wideband (1.2-2.5 GHz), high efficiency, high linearity, Gallium Nitride (GaN), Class J, 200-W power amplifier (PA) is reported. The Class J PA output stages exhibit 45-62% power-added efficiency (PAE) and a near-maximum power match over 2:1 bandwidth, and impressive 802.11g WLAN linearity. This linear PA has 65 to 70-dB small-signal gain over this bandwidth. |
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| Physics Based Analysis of Gallium Nitride (GaN) High Electron Mobility Transistor (HEMT) for Radio Frequency (RF) Power and Gain Optimization |
Dec 2011 |
14 pages |
| Authors:
Pankaj B Shah; Joe X Qiu; ARMY RESEARCH LAB ADELPHI MD
|
| The power and gain characteristics of a power radio-frequency (RF) gallium nitride (GaN) high electron mobility transistor (HEMT) were investigated by using drift-diffusion model simulations that were self consistently solved with the current-voltage (I-V) characteristics of the external circuit elements. The results showed the expected drop in gain with frequency, as the corresponding output power increases, can be modeled with device physics considerations. This technique can be used to optimize ... |
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| Quantum Cascade Laser Master-Oscillator Power-Amplifier with 1.5-W Output Power at 300 K |
25 May 2011 |
8 pages |
| Authors:
Stefan Menzel; Laurent Diehl; Christian Pfluegl; Anish Goyal; Christine Wang; Antonio Sanchez; George Turner; Federico Capasso; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
| We report quantum cascade laser (QCL) master-oscillator power-amplifiers (MOPAs) at 300 K reaching output power of 1.5 W for tapered devices and 0.9 W for untapered devices. The devices display single-longitudinal-mode emission at n=7.26 um and single-transverse-mode emission at TMoo. The maximum amplification factor is 12.2 dB for the tapered devices. |
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| Manufacturable Tri-Stack AlSb/InAs HEMT Low-Noise Amplifiers Using Wafer-Level-Packaging Technology for Light-Weight and Ultralow-Power Applications |
May 2009 |
4 pages |
| Authors:
Y C Chou; P Chang-Chien; J M Yang; M Y Nishimoto; K Hennig; M D Lange; X Zeng; M R Parlee; C H Lin; L S Lee; NORTHROP GRUMMAN INC REDONDO BEACH CA
|
| A wafer-level-packaging technology was used to integrate the 0.1 m AlSb/InAs HEMT low-noise amplifiers with power amplifiers, switches and phase shifters to form a compact tri-stack transmit/receive module for light-weight and ultralow-power applications. The high manufacturability of AlSb/InAs HEMT receivers operating at 0.9 mW was demonstrated on a tri-stack wafer. This demonstration of manufacturable tri-stack transmit/receive modules is essential for phased-array applications requiring light weight and ultralow power. |
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| Progress on Fabrication and Testing of the Omniguide Traveling-Wave Tube Structures |
Apr-2008 |
3 pages |
| Authors:
Evgenya I Smirnova; Bruce E Carlsten; Lawrence M Earley; LOS ALAMOS NATIONAL LAB NM
|
| We have designed, fabricated and tested with low power a novel W-band traveling-wave tube (TWT) structure based on a slow-wave cylindrically-symmetric photonic band gap (PBG) structure, or an omniguide. PBG TWT structures have great potential for very large bandwidth and linear dispersion. The omniguide structure was designed and fabricated with silica dielectric with a copper harness. Cold test results were found to be in excellent agreement with the design. A ... |
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| Proceedings of the Antenna Applications Symposium (30th) Held in Monticello, Illinois on 20-22 September, 2006. Volume 1 |
26 FEB 2007 |
|
| Authors:
Daniel Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
 | The Proceedings of the 2006 Antenna Applications Symposium is a collection of state-of-the art papers relating to antenna arrays, millimeter wave antennas, simulation and measurement of antennas, integrated antennas, and antenna bandwidth and radiation improvements. |
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| Fiber-Based 589 nm Laser for Sodium Guide Star |
FEB 2006 |
22 pages |
| Authors:
Lars J. Nilsson; Yoonchan Jeong; Pascal Dupriez; SOUTHAMPTON UNIV (UNITED KINGDOM) OPTOELECTRONICS RESEARCH CENTRE
|
| This report results from a contract tasking University of Southampton as follows: The work will entail the construction of the required sub-assemblies, their integration into the laser source, and the exploration and adjustment of parameters in order to obtain adequate performance. We have reasonable versions of several of the needed fibers, and though we are likely to have to fabricate new fiber, this requirement is assumed to be modest. The ... |
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| Benefits of Superconductor Digital-RF Transceiver Technology to Future Wireless Systems |
2006 |
7 pages |
| Authors:
Deepnarayan Gupta; Alan M. Kadin; Oleg A. Mukhanov; Jack Rosa; David Nicholson; HYPRES INC ELMSFORD NY
|
| Ultrafast superconductor digital microelectronic circuits operate at speeds up to 100 GHz, enabling true digital-RF architecture. This permits direct conversion between analog RF and digital baseband signals, replacing frequency and protocol-specific analog hardware with flexible, software-programmable digital processors. On the receive side, high sampling-speed (20 Gsamples/s) and linearity (>100 dB spur-free dynamic range) of superconductor analog-to-digital converters (ADCs), digital down-converters and ultrafast (20 GHz) digital filters have already been demonstrated ... |
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| MDA/MP Radar and RF Insertion |
23 AUG 2005 |
29 pages |
| Authors:
MISSILE DEFENSE AGENCY WASHINGTON DC
|
| MDA/MP Radar Program investing in a number of technologies and approaches: WBG high power amplifier producibility and reliability; advanced thermal management to support HPA insertion; new architectures for T/R modules/TRIMMS to Enhance Thermal Management/lower cost; active and passive heat extraction at TRIMM level; heat exchangers at the system level; composite materials to reduce antenna weight/enhance thermal; system engineering approach for HPA to Ultimate Heat Sink (air/sea). |
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| Feasibility of T/R Module Functionality in a Single SiGe IC |
AUG 2005 |
25 pages |
| Authors:
John D. Cressler; Jonathan Comeau; Joel Andrews; Lance Kuo; Matt Morton; John Papapolymerou; Mark Mitchell; Tracy Wallace; Mike Harris; Bob Parks; GEORGIA INST OF TECH ATLANTA
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| Accelerated Development of a High Field Single Electron Spin Microscope |
30 APR 2005 |
9 pages |
| Authors:
Karoly Holczer; CALIFORNIA UNIV LOS ANGELES
|
| This program has significantly accelerated the construction of a Single Electron Spin Microscope (SESM) - by this time practically completed - and the ideas proposed has been successfully realized. In this final report we emphasize those aspects of the SESM construction where funding provided under this pilot project made a substantial difference in the planning and design phase of the development even if additional funds were required for the eventual ... |
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| Beam Combining via Orientational Stimulated Scattering: Numerical Modeling and Analytic Solutions |
10 AUG 2004 |
22 pages |
| Authors:
C. Tsai; I. V. Ciapurin; L. B. Glebov; N. V. Tabirian; B. Y. Zeldovich; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| Many present-day solid-state lasers can generate very large CW power, especially in the regime of Master Oscillator Power Amplifier (MO-PA) scheme. The task of combining individual beamlets into one high-power beam of diffraction quality is therefore quite important. One of the ways of beam combining and clean-up has been suggested recently 1. It is based on the use of Stimulated Orientational Scattering in a Nematic Liquid Crystal (NLC) 2, 3. ... |
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| Electronically Integrated Active Compliant Transmission (ACT) Actuation Technologies Proof-of-Concept Investigation of Active Velcro for Smart Attachment Mechanisms |
01 DEC 2003 |
99 pages |
| Authors:
Diann Brei; Douglas Lindner; Mary Frecker; Chris LaVigna; Joe Clement; MICHIGAN UNIV ANN ARBOR DEPT OF MECHANICAL ENGINEERING
|
| This report provides a summary of the motivation, methodology and research results for two different projects supported under this effort. In Electrically integrated active compliant transmission (ACT) Actuation Technologies two different actuation approaches were developed, modeled, fabricated and experimentally validated: 1) a d31-approach based on the Recurve architecture that generates higher forces and 2) a d33-approach based upon a compliant mechanism that provides more amplified strain. A first-generation power amplifier ... |
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| Progress in Grid Amplifiers |
MAY 2003 |
|
| Authors:
Chun-Tung Cheung; Blythe Deckman; James J. Rosenberg; David B. Rutledge; CALIFORNIA INST OF TECH PASADENA DEPT OF ELECTRICAL ENGINEERING
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| In view of the growth in demand in high data rate communications, satellite communications, radar imaging and detection applications and astronomical applications, microwave and millimeter wave power amplifiers capable of providing tens of watts are in need. The recent improvements in III-V solid-state technology provide high yield reliable transistors that can be fabricated in a large quantity. This capability allows the development of grid amplifiers combining power of more than ... |
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| A Review of the Development of Multiple-Beam Klystrons and TWTs |
17 MAR 2003 |
45 pages |
| Authors:
Gregory S. Nusinovich; Baruch Levush; David K. Abe; NAVAL RESEARCH LAB WASHINGTON DC
|
| This memorandum summarizes the current (as of 2002) development status of microwave and millimeter-wave amplifiers based on multiple electron beam technology. A brief historical perspective of multiple-beam amplifier (MBA) research and development in the U.S. and abroad is presented covering the period from 1940 to 2002. Based on material gathered from conference and workshop presentations and recent open-literature journal publications, we summarize the current state-of-the-art in MBA device performance in ... |
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| Green Thread Pipe Evaluation at Lualualei, HI and Jim Creek, WA |
16 AUG 2002 |
23 pages |
| Authors:
R. A. Lamontagne; NAVAL RESEARCH LAB WASHINGTON DC
|
| This report summarizes the study of Green Thread fiberglass piping that was installed at the Lualualei, HI and Jim Creek, WA VLF sites. This Green Thread pipe was introduced to these VLF sites in 1996 and 1997, respectively, as a replacement for the original materials used to conduct cooling water to and from the power amplifier tubes. The Naval Research Laboratory was tasked with monitoring the changes in water quality ... |
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| Autonomous Acoustic Source |
JUN 2002 |
9 pages |
| Authors:
William S. Hodgkiss; CALIFORNIA UNIV REGENTS LA JOLLA CA SCRIPPS INST OF OCEANOGRAPHY
|
| An autonomous acoustic source buoy system has been designed and fabricated for use in the collection of underwater acoustic propagation data. The system consists of a surface buoy which provides battery power, signal waveform synthesis, power amplification, system control, and wireless local area network (WLAN) communications. |
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| Advanced High Electron Mobility Transistor (HEMT) Monolithic Millimeter- Wave Integrated Circuit (MMIC) Circuits for Millimeter- and Submillimeter-Wave Power Sources |
MAY 2002 |
7 pages |
| Authors:
Lorene Samoska; Alejandro Peralta; HRL LABS LLC MALIBU CA
|
| This paper focuses on InP-based, HEMT Monolithic Millimeter-wave Integrated Circuit (MMIC) power amplifiers for applications to heterodyne receivers, transmitters, and communication circuits. Recently, JPL has developed several HEMT MMIC circuits using HRL Laboratories' 0.1 micrometer InP HEMT technology with unprecedented high frequency performance and output power. Results include an 80 OHz bandwidth power amplifier to 145 GHz, a 15-25 mW amplifier to 170 GHz and a HEMT active doubler to ... |
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| AFRL/GaAsTek Heterojunction Bipolar Transistor (HBT) Process Development |
OCT 2001 |
5 pages |
| Authors:
James K. Gillespie; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH SENSORS DIRECTORATE
|
| A CRDA was established between Aerospa9e Components and Subsystem Division (AFRL/SND) and ITT GaAsTek to transfer the design, manufacture, and development of the Air Force's thermally shunted HBT (TSHBT) process to GaAsTek and to co-develop, design, and fabricate novel power amplifiers using GaAsTek's Process 5 MMIC foundry. GaAsTek was a well-known DoD MMIC foundry for high-power x-band amplifiers utilizing MESFET technology. AFRL/SND was known for developing a TSHBT capability for ... |
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| Report of Green Thread Pipe Installation at Laulualei, HI and Jim Creek, WA VLF Sites: Changes from 1997 to 2001 |
12 JUL 2001 |
19 pages |
| Authors:
Robert A. Lamontagne; NAVAL RESEARCH LAB WASHINGTON DC
|
| This report summarizes the on-going study of Green Thread fiberglass piping that was installed at the Laulaulei, HI and Jim Creek, WA VLF sites. This Green Thread pipe was introduced to these VLF sites in 1996 and 1997, respectively, as a replacement for the original materials used to conduct cooling water to and from the power amplifier tubes. The Naval Research Laboratory was tasked with monitoring the changes in water ... |
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| Mechanisms and Control of Chaos and Halos in High Power Microwave Tubes |
04 APR 2001 |
36 pages |
| Authors:
Chiping Chen; MASSACHUSETTS INST OF TECH CAMBRIDGE PLASMA FUSION CENTER
|
| This report summarizes our research carried out under the auspices of the above referenced grant from July 1, 1997 to June 30, 2000. The goal of this research is to investigate chaos, halos and confinement in beam plasmas in regimes relevant to the development of advanced microwave/millimeter wave sources. An important issue in the design of HPM tubes is how to prevent high- intensity relativistic electron beams from forming halos ... |
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| 2-D Modeling of GaN HEMTS Incorporating the Piezoelectric Effect |
MAR 2001 |
72 pages |
| Authors:
Karl P. Eimers; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Gallium Nitride (GaN) High Electron Mobility Transistors (HEMTs) are microwave power devices that promise to revolutionize the capability of Navy radar systems. The Office of Naval Research is currently finding basic research of developing microwave power amplifiers for use in future radar systems. This thesis incorporates piezoelectric (PZ) equations in the Silvaco Atlas software for modeling GaN/AlGaN structures. The PZ effect enhances a two dimensional electron gas at the GaN/AIGaN ... |
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| Equipment for System Demonstration of Phased Array Antenna Using Polymer-Based Optical True Time Delay Module |
31 AUG 2000 |
26 pages |
| Authors:
Ray T. Chen; TEXAS UNIV AT AUSTIN MICROELECTRONICS RESEARCH CENTER
|
| A novel 1-to-64 (6-bit(2.6)) optical true-time delay module that can provide linear time delays ranging from 0 to 443.03 picoseconds is presented. The total insertion loss, including the propagation loss and the 1-to-64 fan-out loss is confirmed to be less than 20 dB. The crosstalk among channels is measured to be less than - 40 dB. The polarization dependent loss among 64 fan- outs is within 0.37 dB. The bandwidth ... |
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| Broadly Tunable Narrow Line Color Center Laser Oscillation for MolecularGas Spectroscopy and Excitation |
AUG 2000 |
86 pages |
| Authors:
GENERAL PHYSICS INST MOSCOW (RUSSIA) LASER MATERIALS AND TECHNOLOGY RESEARCHCENTER
|
| This report results from a contract tasking Laser Materials and Technology Research Center of the General Physics Institute as follows: The contractor will investigate color center laser crystals operating at room temperature in the 1 - 1.5 micron spectral range with nanosecond neodymium laser pumping, and especially addressing narrow line operation and power amplification, including study of different optical laser schemes and optimization ... |
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| Waveguide-Based Spatial Power Combiners |
01 JUN 2000 |
15 pages |
| Authors:
Robert A. York; CALIFORNIA UNIV SANTA BARBARA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The objective of this program was to explore certain extensions of waveguide-based combiner systems in order to extend or enhance operating bandwidth and amplifier capacity. Oversized TEM-mode combiners were originally proposed which promise multi-octave bandwidths, and an enlarged cross-section compared with standard waveguide, which accommodates a larger number of amplifiers. During the program and in consultation with DARPA and ARO program managers, the program ... |
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| Submerged Object Detection and Classification System. |
23 MAR 1999 |
|
| Authors:
Richard W. Harrison; John F. Scarzello; OFFICE OF THE SECRETARY OF THE NAVY WASHINGTON DC
|
| A detection and classification system for underwater objects uses a transmitting unit and a receiving unit. The transmitting unit comprises a waveform generator, a power amplifier, and a transmitting antenna. The receiving unit comprises a receiving antenna a pre-amplifer a first harmonic suppressor a digitizer, and a computer. The transmitting unit radiates an analog electromagnetic wave signal into a conductive medium such as seawater which the receiving unit detects and ... |
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| Advanced Vacuum Equipment for Laser Plasma Research |
31 AUG 1998 |
7 pages |
| Authors:
J. Scharer; WISCONSIN UNIV-MADISON DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This equipment grant was utilized to provide two state-of-the-art vacuum facilities for seeded air plasma research on the AFOSR Grant F49620-97- 0262 entitled "Laser and Radiofrequency Plasma Sources." Over $24,000 in University matching funds were provided to acquire the equipment. The laser plasma facility provided a first class vacuum facility with dry, chemically hardened, turbopump and mechanical pumps, vacuum windows and lenses for the ultraviolet laser, a residual gas analyzer ... |
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| Tunable Lasers for Investigation of Fiber Optic Devices, 1997 DURIP program |
AUG 1998 |
9 pages |
| Authors:
P. D. Dapkus; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES
|
| Equipment to support research into novel fiber optic devices has been acquired. Tunable lasers near 1.3 microns and 1.55 microns and a polarization controller to characterize the functionality of Microoptical devices and circuits based on Microresonators were purchased and inserted into a comprehensive guided wave device test system. The 1.3 microns laser was donated by SDL, Inc. And was offered as a cost share to the ... |
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| An Ultraviolet X-Ray Laser Source for Core Level Spectroscopy and Dynamics of Metal Cluster/Ceramic Chemistry |
31 MAY 1998 |
3 pages |
| Authors:
Stephen R. Leone; Veronica M. Bierbaum; COLORADO UNIV AT BOULDER
|
| A titanium sapphire ultrafast laser system was procured and merged with a high repetition rate pulsed valve to produce higher harmonic light output in a rare gas jet. The ultrafast laser system consists of a seed laser, a regenerative amplifier, and a two-pass power amplifier. The system operates' at 2.8 mJ energy per pulse, 75 fs pulse duration, and 1000 Hz repetition rate. Higher harmonics up to 20 eV have ... |
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| Comparison of Amplitude Noise Properties of Solid State Laser Oscillators and Amplifiers |
04 MAY 1998 |
135 pages |
| Authors:
Roberta M. Ewart; STANFORD UNIV CA DEPT OF ELECTRICAL ENGINEERING
|
| There is an ongoing need for more capable laser sources that combine high average power with quantum noise limited performance for applied physics and photonic engineering applications, including free space optical communications systems, heterodyne spectroscopy and laser interferometry for gravity wave detection. At this time, one of the most plausible laser candidates to meet the application requirements is the diode laser pumped solid state laser (DPSSL). To push the state ... |
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| Multi-Tuned Acoustic Projector |
04 MAR 1998 |
18 pages |
| Authors:
Robert J. Obara; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A system and method for operating an acoustic projector is provided which allows efficient operation of the projector over a wide bandwidth. The system and method use multiple power amplifiers each tuned to operate over separate and narrow bandwidths, the number of separate bandwidths corresponding to the number of amplifiers such that the total bandwidth is covered. Each tuning network assembly includes the power amplifier, a transformer and a tuning ... |
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| Large Scale Electromagnetic Computation on Nonlinear Optical Systems |
23 FEB 1998 |
4 pages |
| Authors:
J. V. Moloney; ARIZONA UNIV TUCSON DEPT OF MATHEMATICS
|
| The award went towards the purchase of an ONYX2 Silicon Graphics rack system with an internal graphics engine and six 195MHZ CPUs. The significantly increased computing capacity resulting from the DUPIP award has enabled us to work on the following projects: (1) Structure Dependence of the Linewidth Enhancement Factor: A Full Microscopic Many-body Calculation; (2) High Speed Current Modulation of High Power MOPA Devices; (3) Critical ... |
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| Novel Micromechanical Tunneling Structures for Sensor Applications |
1998 |
5 pages |
| Authors:
M. A. McCord; A. Dana; R. F. Pease; STANFORD UNIV CA SOLID-STATE ELECTRONICS LAB
|
| Electrostatically controlled micro-cantilevers with integrated tunnel junctions can form the basis of a number of interesting devices with sensor applications. Use of a tunnel junction provides an extremely sensitive way to sense the cantilever position. In its simplest form the device can be used as a high gain, extremely low power amplifier. If the cantilever were fabricated from a bimetallic strip, it becomes a temperature sensor suitable for use as ... |
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| Active RF Cavity and Applications |
DEC 97 |
156 pages |
| Authors:
Bernard R. Cheo; Jerry Shmoys; Frank Cassara; Meng-ken Ke; Lin-wen W. Cheo; ARIA MICROWAVE SYSTEMS INC ENGLEWOOD NJ
|
| Active RF cavity amplifier (ARFCA) is a solid state device (SSD) based amplifier which uses the cavity simultaneously as the combiner, the matching transformer and the heat sink. As prototype device was developed using six Motorola MFR/6030 transistors or equivalent operating over 1.6 - 1.7 GHz. The device as given by the Motorola data book has a nominal (below saturation) output power gain at 7.5 dB min and 7.7 dB ... |
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| Slotted High-Harmonic Peniotron Oscillator |
08 OCT 97 |
7 pages |
| Authors:
N. C. Luhmann Jr; CALIFORNIA UNIV DAVIS DEPT OF APPLIED SCIENCE
|
| The novel, highly efficient peniotron interaction has been studied experimentally and theoretically. The concept that mode selective circuits can be used to realize high power harmonic gyro-TWT amplifiers, which has been verified by the P.I.'s experimental group, has been extended to peniotrons for the design of an efficient high power peniotron oscillator. The peniotron is predicted to generate 120kW with an unprecedented conversion efficiency of 63%. |
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| Low Engery/Low Noise Elec. Comp. for Mobile Platform Apps |
13 JUN 97 |
30 pages |
| Authors:
S. K. Leong; Krishna Shenai; ILLINOIS UNIV AT CHICAGO CIRCLE
|
| We prototyped Polyfet RF Device's 80V LDMOSFETs on bulk silicon substrates using advanced numerical two-dimensional (2D) finite-element semiconductor process and device simulators and showed excellent agreement between measured and simulated DC and RF parameters. This infrastructure was then used to develop a number of 40V LDMOSFET designs, both on bulk silicon and SOI material, and identify optimum device structures suitable for further development in Phase II. Our Phase I research ... |
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| Ceramic/Metal Composite Circuit-Board Level Technology for Application Specific Electronic Modules (ASEMs) |
JUN 97 |
15 pages |
| Authors:
B. J. Thaler; DAVID SARNOFF RESEARCH CENTER PRINCETON NJ
|
| The quarterly progress for the Ceramic/Metal Composite Circuit-Board- Level Technology for Application Specific Electronic Modules is described in this report. Data is reported for the following tasks: Technology Transfer to Merchant Suppliers, and Fabrication and Testing of Technology Demonstration Modules. |
|
| Kilowatt Yb:YAG Laser Illuminator |
01 MAR 1997 |
5 pages |
| Authors:
David S. Sumida; Hans Bruesselbach; Robin Reeder; Robert W. Byren; HUGHES RESEARCH LABS MALIBU CA
|
| We report 0.6 kW quasi-cw output power for our diode- side-pumped Yb:YAG power oscillator. This 2-mm diameter rod pump cavity is the smallest of three pump cavities slated for use in a multi-kilowatt Yb:YAG illuminator master-oscillator power-amplifier (MOPA) source. In preliminary results, we have also obtained 225 W cw average output power using alternative cw pump diode arrays. Latest performance data and on-going MOPA development will be described. |
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| Ceramic/Metal Composite Circuit-Board-Level Technology for Application Specific Electronic Modules (ASEMs) |
11 DEC 96 |
37 pages |
| Authors:
B. J. Thaler; A. N. Sreeram; E. S. Tormey; P. Palanisamy; M. Liberatore; DAVID SARNOFF RESEARCH CENTER PRINCETON NJ
|
| The quarterly progress for the Ceramic/Metal Composite Circuit-Board- Level Technology for Application Specific Electronic Modules is described in this report. Data is reported for the following tasks: Technology Transfer to Merchant Suppliers, Customize LTCC-M for Specific Applications, and Fabrication and Testing of Technology Demonstration Modules. |
|
| Predistortion of Quadrature Amplitude Modulation Signals Using Volterra Series Approximation |
DEC 96 |
96 pages |
| Authors:
Michael T. Donovan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Modern digital communication systems are being called upon to move ever increasing amounts of information over decreasingly available bandwidth. This requires that communication systems employ bandwidth-efficient modulation schemes to conserve bandwidth while moving the information at higher data rates. A major stumbling block to using higher order modulation schemes in long haul communication is the distortion caused by high power amplifiers. These high power amplifiers are required to amplify the ... |
|
| Real-Time 3-D Ultrasonic Diagnostic Imager for Battlefield Application |
OCT 96 |
102 pages |
| Authors:
Timothy White; Anthony M. Nicoli; Kenneth Erikson; LORAL INFRARED AND IMAGING SYSTEMS INC LEXINGTON MA
|
| This program seeks to apply a solid state, staring, ultrasonic hybrid array to demonstrate the first real-time, portable, C-scan diagnostic ultrasound medical imaging system with three-dimensional (3-D) capability for battlefield and trauma care. The objective of Phase II of the BUDI program is to demonstrate a prototype ultrasonic imager capable of high quality ultrasound imagery suitable for 3D reconstruction. Phase II is a two year effort. This report covers the ... |
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| Airborne Suspension/Vibration Isolation System |
AUG 1996 |
73 pages |
| Authors:
David A. Kienholz; CSA ENGINEERING INC PALO ALTO CA
|
| A hybrid passive-active vibration isolation system for airborne optical systems is described. Designed for the requirements of the Air Force Airborne Laser program, it uses an advanced semipassive system of pneumatic mounts to support the payload weight with very low stiffness and hysteresis. Horizontal isolation is accommodated by passive means using all-metal flexures. High-force voice coil actuators act on the payload in all six degrees of freedom with vertical actuators ... |
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| Micro-Electron Deflector. |
05 MAR 1996 |
|
| Authors:
Cha-Mei Tang; Antonio C. Ting; Thomas A. Swyden; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An electron deflection device responsive to an electrical input signal for producing an output signal includes a focusing array for producing a collimated electron beam input ribbon in the direction of a propagation axis, the input ribbon being elongated along an array axis perpendicular to the propagation axis, and being relatively thin along a deflection axis perpendicular to the array axis and to the propagation axis. The focusing array is ... |
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| Concept-Level Analytical Procedures for Loading Nonprocessing Communication Satellites with Direct-Sequence, Spread-Spectrum Signals |
96 |
|
| Authors:
Edward Bedrosian; Gaylord Huth; RAND CORP SANTA MONICA CA
|
| This report is the second in a series devoted to presenting the analytical procedures and mathematical formulations required to construct a computer model of a military communication satellite system, load it efficiently with the radio signals required to support an operational scenario, and assess its vulnerability to jamming. It does not address the implementation of the model. Like MR-639-AF/A, the first report of this series, the analysis is restricted to ... |
|
| MESFET Grid Oscillators - Injection-Locking, Power Design and Modulation |
31 DEC 95 |
7 pages |
| Authors:
Zoya B. Popovic; COLORADO UNIV AT BOULDER DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| A pc-based program was developed for design-oriented analysis of grid oscillator power combiners. The program was also extended to analysis of arbitrary cascaded quasi-optical active and/or passive components. Validation on passive unloaded gratings, passive loaded gratings and active gratings has been carried out and analysis agrees with measurements favorably. Grid oscillators designed using this theory have been implemented as sources in a two-level power-combining system consisting of a grid oscillator ... |
|
| Ceramic/Metal Composite Circuit-Board-Level Technology for Application Specific Electronic Modules (ASEMs) |
12 SEP 95 |
51 pages |
| Authors:
B. J. Thaler; A. H. Kumar; A. Sussman; V. A. Pendrick; H. C. Rivenburg; DAVID SARNOFF RESEARCH CENTER PRINCETON NJ
|
| This past quarter the LTCC-M Technology Transfer began to Alcoa Electronic Packaging, Inc. Initially, Alcoa will use glasses provided by SEM-COM to produce the green tape and the thick film inks. The glasses will be qualified by Sarnoff for use in LTCC-M. SEM-COM has melted 4 of the 5 custom glasses that were developed during the Phase 1 program. The glasses needed to produce the ... |
|
| Construction and Performance Measurement of a Portable Thermoacoustic Refrigerator Demonstration Apparatus |
DEC 94 |
96 pages |
| Authors:
Todd J. Berhow; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| This thesis documents the construction and performance measurement of a portable thermoacoustic refrigerator demonstration apparatus. The objective of the portable refrigerator is to graphically display, as a demonstration during lectures, a substantial thermoacoustic cooling power. Within minutes of start up, the apparatus develops frost on a small metal portion of the device. The refrigerator is small and compact and fits into a portable carrying case along with all ancillary equipment. ... |
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| Design, Development and Testing of a Prototype Precision Angular Positioning Control System for a Next Generation Multiplexed Imager |
DEC 1994 |
59 pages |
| Authors:
Mark E. Middleton; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| This thesis presents a design for a precision angular position control system for use in a proposed multiplexed imager. The control system is designed to rapidly position a disk to within a tolerance of 2.5 microrad. Evaluation during the design phase shows an inherent trade-off between precision angular positioning and allowed angular velocities. Recommendations are provided for improving the time response of the control system. No testing was performed to ... |
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| Material Characterization System. |
15 NOV 1994 |
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| Authors:
Gilbert F. Lee; Bruce Hartmann; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A plurality of elongated test specimens undergo vibrations induced by random noise within an acoustical frequency range establishing standing waves therein having resonant frequencies at which the collection of measurement data through accelerometers mounted at the ends of the specimens provides for calculation of physical material properties. The processing of the data during collection, analysis and calculation is automated by programmed computer control. (MM) |
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