| Spatially-Resolved System for Polarimetric Measurements at Subwavelength Scales |
24-Sep-2009 |
22 pages |
| Authors:
Aristide Dogariu; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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 | This proposal will purchase an Aurora-3 Near-Field Scanning Optical Microscope (NSOM) that has the capability of high, sub-wavelength spatial resolution, improved focusing mechanism, dual-light path design, and accurate probe-to-sample patented measuring capability making it the most advanced NSOM available. The proposed instrumentation offers superior performance in near-field optical characterization and contrast mechanisms with the high resolution of scanning probe microscopy techniques. The acquisition of this equipment will allow the PI ... |
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| Continuous Wave 30 W Laser-Diode Bar with 10 Ghz Linewidth for Rb Laser Pumping (Postprint) |
15 Sep 2009 |
5 pages |
| Authors:
A Gourevitch; G Venus; V Smirnov; D A Hostutler; L Glebov; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| A laser-diode bar incorporated into an external cavity with a volume Bragg mirror produced 30 W of cw output power within a 20 pm (10 GHz) spectral linewidth (FWHM) centered at 780 nm. The device output power exceeded 90% of that for the free-running laser-diode bar. The emission wavelength was tuned over a 400 pm range without broadening laser spectrum width. Absorption of 90% of the laser radiation by a ... |
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| Thermodynamic and Spectroscopic Properties of Nd:YAG-CO2 Double-Pulse Laser-Induced Iron Plasmas |
Jan 2009 |
8 pages |
| Authors:
Matthew Weidman; Santiago Palanco; Matthieu Baudelet; Martin C Richardson; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| Laser-Induced Breakdown Spectroscopy of iron using both Nd:YAG and TEA-CO2 lasers has been investigated to better understand mechanisms of signal enhancement. The signal dependence on the delay between the two laser pulses shows an enhanced signal when the CO2 laser pulse interacts with the sample before the Nd:YAG pulse. Signal kinetics and a simple model of sample heating by the CO2 pulse show that the enhancement during the first 700 ... |
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| Stand-Off Detection of Organic Samples Using Filament-Induced Breakdown Spectroscopy |
Jan 2009 |
8 pages |
| Authors:
JAMES MARTIN; Matthieu Baudelet; Matthew Weidman; Matthew K Fisher; Candice Bridge; Christopher G Brown; Michael Sigman; Paul J Dagdigian; MARTIN RICHARDSON; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| As an alternative to focusing nanosecond pulses for stand-off LIBS detection of energetic materials, we use self-channeled femtosecond pulses from a Ti:Sapphire laser to produce filaments at 12 meters and create a plasma on copper, graphite and polyisobutylene film. We show the possibilities of this Laser-Induced Breakdown Spectroscopy configuration for thin organic sample detection on a surface at a distance. |
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| Continuous wave, 30 W Laser-Diode Bar with 10 GHz Linewidth for Rb Laser Pumping |
01-Jan-2008 |
4 pages |
| Authors:
A Gourevitch; G Venus; V Smirnov; D A Hostutler; L Glebov; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
|
| A laser-diode bar incorporated into an external cavity with a volume Bragg mirror produced 30W of cw output power within a 20 pm 10 GHz spectral linewidth (FWHM) centered at 780 nm. The device output power exceeded 90% of that for the free-running laser-diode bar. The emission wavelength was tuned over a 400 pm range without broadening laser spectrum width. Absorption of 90% of the laser radiation by a 25 ... |
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| Foveated Wide Field-of-View Imaging for Missile Warning/Tracking using Adaptive Optics |
30 NOV 2007 |
10 pages |
| Authors:
Shin-Tson Wu; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| For adaptive foveated imaging using a high resolution spatial light modulator (SLM), high birefringence and low viscosity LC mixtures are highly desirable. A higher birefringence enables a thinner liquid crystal layer to be used which results in a faster response time. Low viscosity is always favorable as it helps to reduce the SLM response time. For the thin-film-transistor (TFT)-addressed SLM, high resistivity is an extra requirement. In this report we ... |
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| Software Development for Modeling High Power Solid State Slab Lasers |
FEB 2007 |
12 pages |
| Authors:
Michael Bass; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| We will extend this study to smaller grain sizes to determine if the trend observed continues or if the curve eventually turns down. During this period we identified an error in our earlier work on depolarization in crystalline lasers. This error, was caused by a problem in writing the reduced form of the 4th rank tensor that gives the piezo optic effect. It was essential to have found this error ... |
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| Femtosecond High Optical Energy Integrated Compact Semiconductor (FHOENICS) Laser Program (CD-ROM) |
24 Jul 2006 |
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| Authors:
Peter J Delfyett; Eric Johnson; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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 | ELECTRONIC FILE CHARACTERISTICS: 8 files; Adobe Acrobat (.PDF), MS Word (.DOC) and MS PowerPoint (.PPT). PHYSICAL DESCRIPTION: 1 CD-ROM; 4 3/4 in.; 45.5 MB. ABSTRACT: The primary objective of this research project is to generate high power ultrashort optical pulses from an all-semiconductor mode-locked laser system. A secondary objective is miniaturization of the optical components and integration into a compact package. The limitations of semiconductor optical amplifier in high energy, ... |
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| Solitonic Gateless Computing |
29 JAN 2006 |
90 pages |
| Authors:
George Stageman; Demetrios Christodoulides; Paul Prucnell; Mote Segev; Ken Squier; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| A number of logic functions and mathematical operations were implemented in the laboratory based on soliton collisions in photo- refractive media. In addition to the usual NAND and AND logic gates, soliton collisions do transfer information and two successive collisions can be made to mimic a unitary matrix or its inverse. This program dictated and led developments in the field of soliton science and its applications. Its scientific impact was ... |
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| Remote Femtosecond Laser Induced Breakdown Spectroscopy (LIBS) in a Standoff Detection Regime |
Jan 2006 |
8 pages |
| Authors:
C G Brown; R Bernath; M Fisher; M C Richardson; M Sigman; R A Walters; A Miziolek; H Bereket; L E Johnson; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| The need for robust, versatile, and rapid analysis standoff detection systems has emerged in response to the increasing threat to homeland security. Laser Induced Breakdown Spectroscopy (LIBS) has emerged as a novel technique that not only resolves issues of versatility, and rapid analysis, but also allows detection in settings not currently possible with existing methods. Several studies have shown that femtosecond lasers may have advantages over nanosecond lasers for LIBS ... |
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| Control of Filamentation for Enhancing Remote Detection with Laser Induced Breakdown Spectroscopy |
Jan 2006 |
6 pages |
| Authors:
MATTHEW FISHER; Craig Siders; Eric Johnson; Oleksiy Andrusyak; Christopher Brown; MARTIN RICHARDSON; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| We report on the use of a novel phase element to control the far-field intensity pattern generated by a high-peak-power, femtosecond laser. The pre-determined intensity pattern results in a well defined location of the filaments formed by the propagation of these beams through the atmosphere. This enhancement of the localization and repeatability of the intensity distribution can be extremely beneficial for laser induced breakdown spectroscopy (LIBS) of remote regions of ... |
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| Dense Spectral Beam Combining with Volume Bragg Gratings in PTR Glass |
2006 |
6 pages |
| Authors:
Oleksiy Andrusyak; Igor Ciapurin; Vasile Rotar; Armen Sevian; George Venus; Leonid Glebov; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| An incoherent combination of laser radiation from multiple sources into a single near-diffraction-limited beam is an important problem of high power laser design. Energy brightness, but not spectral brightness, can be increased using spectral beam combining (SBC). Initially, SBC was proposed on the basis of conventional surface gratings; however, it was found later that volume Bragg gratings (VBGs) are more efficient for high density SBC with narrow separation between channels. ... |
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| Materials and Modulators for True 3-Dimensional Displays |
SEP 2005 |
66 pages |
| Authors:
Michael Bass; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| The research conducted in this program primarily concerned identification of materials that would serve in scalable real time 3D displays. Such materials would have to experience two photon absorption of two different wavelengths near infrared beams of light only at the intersection of the two beams. Upon such excitation the material would have to emit visible light. Our focus on scalable materials led us to first study organic dyes dissolved ... |
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| Coherence and Polarization Properties of Far Fields Generated by Quasi-Homogeneous Planar Electromagnetic Sources (Postprint) |
03 FEB 2005 |
12 pages |
| Authors:
Olga Korotkova; Brian G. Hoover; Victor L. Gamiz; Emil Wolf; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| In studies of radiation from partially coherent sources the so-called quasi-homogeneous (QH) model sources have been very useful, for instance in elucidating the behavior of fields produced by thermal sources. The analysis of the fields generated by such sources has, however, been largely carried out in the framework of scalar wave theory. In this paper we generalize the concept of the QH source to the domain of the electromagnetic theory, ... |
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| Arrays to Support Spatial Solitons. DoD - MURI Fellowship, April 2, 2000 to April 1, 2004 |
09 NOV 2004 |
8 pages |
| Authors:
George Stegeman; Greg Salamo; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| The focus of this work is to demonstrate discrete solitons in arrays of coupled nonlinear waveguides or the controlled switching of optical information from one line to another. Results have been the successful creation of a linear array of over one hundred soliton waveguides. The array is necessary to demonstrate transfer of energy across the soliton array. The significance or impact is that this project is the first step to ... |
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| Adiabatic Three-Wave Symmetric Volume Hologram |
10 AUG 2004 |
3 pages |
| Authors:
C. C. Tsai; L. B. Glebov; v. i. smirnov; B. Ya. Zeldovich; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| A transmission hologram with two synmmetrically oriented volume gratings is considered in the regime of difraction of wave A into wave B via intermediate weakly excited wave C Adiabatic regime of highly efficient diffraction has the advantage of very low sensitivity to the strength of the gratings. |
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| Fabri-Perot Spectral Filter that Preserves Image |
10 AUG 2004 |
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| Authors:
H. V. Sarkissian; Boris Zeldovich; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| In some cases of active illumination of the target, high-resolution spectral selection may be used for discrimination between targets moving with different velocities and having different chemical compositions. Most monochromators and various spectrographs limit spatial and angular spread of input light, and thus distort the image. Volume diffraction grating at normal incidence may be used for spectral selection. However, spectral resolution delta v (1/cm) is about 1/L (i.e., limited by ... |
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| Periodically Aligned Liquid Crystal: Potential Application for Projection Displays |
10 AUG 2004 |
26 pages |
| Authors:
H. Sarkissian; N. Tabirian; B. Park; B. Zeldovich; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| A nematic liquid crystal (NLC) layer with the anisotropy axis modulated at a fixed rate q in the transverse direction is considered. If the layer locally constitutes a half-wave plate, then the thin-screen approximation predicts 100% -efficient diffraction of normal incident wave. The possibility of implementing such a layer via anchoring at both surfaces of a cell with thickness L is studied as a function of parameter qL and threshold ... |
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| Implementation of 3D Angular Selective Achromatic Diffraction Optical Grating Device |
10 AUG 2004 |
17 pages |
| Authors:
L. Glebov; V. Smirnov; N. Tabirian; B. Zeldovich; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| Angular Selective Achromatic Diffraction Optical Grating (ASADOG) device has been implemented. Surface reflective grating had 1200 lines per mm. Two identical volume holograms were implemented using Photo-Thermo- Refractive (PTR) glass technology, with spatial frequency 1697 lines per mm. Sequential diffraction of incident light by surface grating by first volume grating and then by second one oriented at 90 degrees resulted in angular selection of incident beam, completely achromatic within the ... |
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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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| Beam Clean-Up and Combining via Stimulated Scattering in Liquid Crystals |
10 AUG 2004 |
23 pages |
| Authors:
I. V. Ciapurin; L. B. Glebov; C. Tsai; M. C. Stickley; B. Y. Zeldovich; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| Orientational stimulated scattering from o-wave into e-wave in liquid crystal may combine coherent beams or modes of amplifier(s) into diffraction- limited output. In experiment a 1000 micron liquid crystal layer transmitted undistorted o-wave with low attenuation. |
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| Fresnel Rhomb and Other Devices for Handling and Teaching Polarization: Inexpensive Design |
10 AUG 2004 |
21 pages |
| Authors:
B. Y. Zeldovich; I. V. Ciapurin; H. V. Sarkissian; C. Tsai; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| We demonstrate a pair of 90-45-45 prisms from binoculars appropriately attached to serve as Fresnel rhomb, i.e. achromatic quarter-wave plate. One and two Dove prisms with metallic reflection instead of TIR can work as half-wave plate and polarization rotator. respectively; both achromatic. |
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| PTR Glass Melting Facility for Fabrication of Diffractive Optical Elements |
15 MAY 2004 |
18 pages |
| Authors:
Leonid Glebov; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| The proposed research instrumentation, a Photo-Thermo-Refractive (PTR) Glass Melting Facility, is used to support MDA-funded and new research initiatives in the study of photosensitive glass for rugged volume diffractive optical elements. This instrumentation significantly impacts existing efforts in hologram recording in PTR glasses. Diffractive optical elements made from this glass are used in the BMDO/MDA-funded program "Holographic Narrow-Band Filter and Data Storage for Optical Target Characterization" and a number of ... |
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| Spectral Stabilization of Laser Diodes by External Bragg Resonator |
2004 |
5 pages |
| Authors:
George Venus; Vadim Smirnov; Leonid Glebov; Manoj Kanskar; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| Volume Bragg laser (VOBLA) with feedback produced by a reflective photo-thermo-refractive volume Bragg grating is used for narrowing spectral width and angular divergence of laser diodes. High-efficient, single mode and spectral width of 60 pm at power of 800 mW are demonstrated from 35 and 100 m-stripe laser. The problem of high-brightness, high-efficient semiconductor laser sources with stable narrow emission spectra is important for different kinds of applications. Various constructions ... |
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| Semiconductor 1.7 W Volume Bragg Laser with Divergence Close to a Diffraction Limit |
2004 |
3 pages |
| Authors:
George Venus; Vasile Rotar; Leonid Glebov; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| Novel volume Bragg laser (VOBLA) with two photo-thermo-refractive volume Bragg gratings feedback is studied on the basis of 150 micrometers stripe LD. High-efficient, near diffraction-limited operation at power 1.7W and spectral width of 250pm are demonstrated. |
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| Materials and Modulators for 3D Displays |
AUG 2002 |
36 pages |
| Authors:
Michael Bass; Alexandra Rapaport; Nabeel Riza; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| The research conducted in this program primarily concerned identification of materials that would serve in scalable real time 3D displays. Such materials would have to experience two photon absorption of two different wavelength near infrared beams of light only at the intersection of the two beams. Upon such excitation the material would have to emit visible light. Our focus on scalable materials led us to study organic dyes dissolved in ... |
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| A New Approach to Rugged Optical Components With High Spectral and Angular Selectivity |
23 JUL 2001 |
29 pages |
| Authors:
L. B. Glebov; C. M. Stickley; O. M. Efimov; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| This is a report on a new materials technology, PTR glass, which will make possible rugged, lower cost, light weight optical components having wide application to both low-power and high-power laser systems. Applications we forsee include: both spectral and angular beam steering and beam scanning, high resolution beam filtering, reflecting, transmitting, splitting, beam combining, and correcting of aberrations in telescopes and other optical systems. This PTR glass and some of ... |
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| Antenna-Coupled Infrared Sensors: Next-Generation Uncooled IR Focal Planes |
23 JUL 2001 |
19 pages |
| Authors:
Glenn D. Boreman; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| We report on recent advances on a completely new type of uncooled IR sensor technology, which uses ultrasmall metallic antennas to capture the radiation. By electronically changing the 30-THz current-wave distribution on the antenna structure, the polarization and wavelength responses of the IR sensor can be changed dynamically in response to a small (100 mV) control voltage. The operational advantages to seeker systems are that enhanced target discrimination is possible ... |
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| Equipment for Research on True Three Dimensional Displays |
APR 2001 |
7 pages |
| Authors:
Michael Bass; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| Equipment is described that was purchased for the study of nonlinear absorption in dyes for use in tme, three dimensional displays. A pair of optical parametric oscillators pumped by the same frequency tripled, Q-switched Nd:YAG laser was purchased from Spectra Physics Inc. and installed with appropriate beam control optics. LabView drivers for the laser and the OPOs were written and combined in a master driver controlling the diagnostic equipment and, ... |
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| Optical Amplifiers Based on Vibronic Transitions for Broadband Telecommunications |
04 JAN 2001 |
10 pages |
| Authors:
P. J. Delfyett; B. H. Chai; P. Likamwa; H. Jenssen; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| The aim of this multidisciplinary research project is to investigate and develop compact and cost effective broadband optical amplifiers that operate in 1.3 microns wavelength band. Our approach is based on vibronic solid state laser materials that are used to fabricate guided-wave structures to optimize the high intensity optical interaction distance in the crystals. The successful outcome of this program could lead to a competitive optical network system operating at ... |
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| New Laser and Non-Linear Optical Materials |
JUL 1999 |
28 pages |
| Authors:
Bruce H. Chai; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
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| Our research under the contract is to investigate crystalline laser host materials and not the glasses. However, even with crystalline laser host materials where the thermal conductivity is much higher, it is still necessary to use slab geometry for high power operations with high repetition. Given the same geometry, material that has high thermal conductivity and high thermal mechanical strength is definitely preferred. Under this contract, we conducted a serious ... |
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Reports by Corporate Author
