| Observation of Query Pulse Length Dependent Ramsey Interference in Rubidium Vapor Using Pulsed Raman Excitation |
07 Nov 2011 |
15 pages |
| Authors:
G S Pati; F K Fatemi; M S Shahriar; NAVAL RESEARCH LAB WASHINGTON DC OPTICAL SCIENCES DIV
|
 | We report observation of query pulse length dependent Ramsey interference (QPLD-RI), using pulsed Raman excitation in rubidium vapor. This is observed when a long, attenuated query pulse is used during pulsed Raman excitation. We explain the physical mechanism behind the QPLDRI using a Bloch vector model. We also use numerical solutions to time-dependent density matrix equations to simulate this interference effect showing qualitative agreement with experimental results. Presence of such ... |
|
| Non-Evaporative Cooling Using Spin-Exchange Collision in an Optical Trap |
03-Feb-2009 |
33 pages |
| Authors:
Jacob L Roberts; COLORADO STATE UNIV FORT COLLINS
|
| This report describes, with references, three areas of research that addressed open questions relevant to the implementation of a novel nonevaporative cooling technique for ultracold gases, called collision-assisted Zeeman (CAZ) cooling. First, robust CAZ cooling requires efficient optical pumping in dense ultracold gases in which reabsorption of scattered photons is a serious limitation. Mitigation of reabsorption in such gases via the temporal and spatial modulation of light is reported. Second, ... |
|
| Single Ca+ Ion Trapping and Quadrupole Transition Measurement Towards an Optical Frequency Standard |
01-Nov-2007 |
13 pages |
| Authors:
Kensuke Matsubara; Ying Li; Hiroyuki Ito; Shigeo Nagano; Kazuhiro Hayasaka; Mizuhiko Hosokawa; NATIONAL INST OF INFORMATION AND COMMUNICATIONS TECHNOLOGY (NICT) TOKYO (JAPAN)
|
| NICT in Japan is developing an optical frequency standard using a quadrupole transition of single Ca+. After our first measurement, reported at PTTI 2006, we have improved the experimental setup. We have performed laser cooling using two cooling lasers, improved vacuum pressure with an additional getter pump, and introduced a pulse-light sequence to the transition measurement. In consequence, we observed the quadrupole transition with a linewidth of approximately 25 kHz ... |
|
| A 2D Electron Density and Plasma Current Density Diagnostic for Opening Switches |
FEB 2006 |
56 pages |
| Authors:
John J. Moscella; Conrad C. Klepper; HY-TECH RESEARCH CORP RADFORD VA
|
| A program to develop diagnostics for plasma opening switches has been completed. HY-Tech has investigated 2D interferometry using a short pulsed laser for determining the electron density distribution and multi-chord spectroscopic observations for determining the plasma current density. The electron density diagnostic used a short pulsed (10 ns) Nd:YAG laser to form interferograms using a Mach-Zehnder arrangement. These interference patterns were captured using a scientific grade CCD camera. HY-Tech developed ... |
|
| Theory of Monte-Carlo Simulations of the Magnetic Circular Dichroism (MCD) Spectra of Alkali Metal/Rare Gas Systems (POSTPRINT) |
09 MAR 2005 |
13 pages |
| Authors:
John W. Kenney; Jerry A. Boatz; Heidi A. Vosbein; CONCORDIA UNIV IRVINE CA
|
| The history of magnetic circular dichroism (MCD) spectroscopy in the study of alkali metal/rare gas (M/Rg) cryogenic systems is reviewed in the context of developing a better understanding of alkali metal/hydrogen systems of current interest to the U.S. Air Force as enhanced-performance cryogenic rocket propellants. A new theory for simulating the MCD spectra of M/Rg systems is presented together with a careful discussion of the theory's implicit and explicit approximations ... |
|
| Dark States and deBroglie Wave Optics |
01 MAY 2003 |
8 pages |
| Authors:
Harold Metcalf; STATE UNIV OF NEW YORK AT STONY BROOK RESEARCH FOUNDATION
|
| This paper presents the results of experiments conducted at the Research Foundation of SUNY, Stony Brook, NY, by Ph.D. and Master's degree students, undergraduates, visiting high school students, and senior visitors on the manipulation of metastable Helium atoms with polychromatic optical forces, and the study of their properties in dark states, entangled states, and other superpositions. These experiments led to the publication of several Doctoral Theses and other papers. Results ... |
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| Near-Field Photoluminescence Spectroscopy of Localized States in InGaAsN Alloys |
JAN 2002 |
6 pages |
| Authors:
A. M. Mintairov; P. A. Blagnov; T. Kosel; J. L. Merz; V. M. Ustinov; NOTRE DAME UNIV IN DEPT OF ELECTRICAL ENGINEERING
|
| We used near-field magneto-photoluminescence scanning microscopy to study structural and optical properties of quantum-dot-like compositional fluctuations in GaAsN and InGaAsN alloys. We show that these fluctuations manifest themselves by the appearance of narrow emission lines (half width 0.5-2 meV) at temperatures below 70 K. We estimated the size, density, and nitrogen excess of individual compositional fluctuations (clusters), revealing phase-separation effects in the distribution of nitrogen in GaAsN and InGaAsN. We ... |
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| Mid-Infrared Induced Energy Transfers in Si:Er |
16 OCT 2001 |
10 pages |
| Authors:
Tom Gregorkiewicz; AMSTERDAM UNIV (NETHERLANDS)
|
| Excitation and de-excitation mechanisms responsible for photoluminescence of Er(3+) ion in crystalline silicon were investigated by a variety of experimental techniques. Special emphasis was on the two-color time- resolved spectroscopy in the mid-infrared performed at a free-electron laser facility. Application of this technique for spectroscopic investigations of energy transfers within the Si:Er system has been originally proposed and developed in the team of the Principal Investigator. This unique experimental approach ... |
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| Spin Quantum Beats of Hot Trion in Quantum Dots |
JUN 2001 |
4 pages |
| Authors:
I. E. Kozin; V. G. Davydov; I. V. Ignatiev; A. Kavokin; K. Kavokin; SAINT PETERSBURG STATE UNIV (RUSSIA) INST OF PHYSICS
|
| Spins of resident holes in charged quantum dots (QD's) act as local magnets inducing Zeeman splitting of excitons trapped into dots. This has been evidenced by observation of quantum beats in linearly polarized time-resolved photoluminescence of a biased array of self-assembled InP QD's. A theory is developed that considers the exchange interaction within the positively charged exciton (trion) states formed in the QD. |
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| Injection of Spin-Polarized Carriers from a ZnMnSe/CdSe Semimagnetic Superlattice into a Non-Magnetic ZnCdSe Quantum Well |
JUN 2001 |
4 pages |
| Authors:
Ya. V. Terent'ev; A. A. Toropov; S. V. Sorokin; A. V. Lebedev; S. V. Ivanov; RUSSIAN ACADEMY OF SCIENCES SAINT PETERSBURG IOFFE PHYSICAL-TECHNICAL INST
|
| We report on magneto-optical studies of spin injection from a ZnMnSe/CdSe semimag- netic short-period superlattice (SL) to a non-magnetic ZnCdSe quantum well (QW). The carriers are photo-generated in the semimagnetic SL spin polarized via the effect of giant Zeeman splitting and then injected into the non-magnetic QW through a tunneling mechanism. Near 25% injection efficiency has been demonstrated at the magnetic field of 0.8 T and low temperature (1.8 K). ... |
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| Spin Quantum Beats in InP Quantum Dots in a Magnetic Field |
JUN 2001 |
4 pages |
| Authors:
I. A. Yugova; V. G. Davydov; I. Ya. Gerlovin; I. V. Ignatiev; I. E. Kozin; SAINT PETERSBURG STATE UNIV (RUSSIA) INST OF PHYSICS
|
| In this paper, we studied quantum beats observed in kinetics of photoluminescence of a single layer of InP self-assembled quantum dots in a magnetic field. The reason for the quantum beats is shown to be Zeeman splitting of the exciton radiative level. Studies of behavior of the quantum beats versus the magnetic field magnitude and orientation and versus polarization of the exciting and detected light have allowed us to identify ... |
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| Electron and Nuclear Spin Interactions in the Optical Spectra of Single GaAs Quantum Dots |
28-May-2001 |
5 pages |
| Authors:
D Gammon; Al L Efros; T A Kennedy; M Rosen; D S Katzer; D Park; S W Brown; V L Korenev; I A Merkulov; NAVAL RESEARCH LAB WASHINGTON DC
|
| Fine and hyperfine splittings arising from electron, hole, and nuclear spin interactions in the magnetooptical spectra of individual localized excitons are studied. We explain the magnetic field dependence of the energy splitting through competition between Zeeman, exchange, and hyperfine interactions. An unexpectedly small hyperfine contribution to the splitting close to zero applied field is described well by the interplay between fluctuations of the hyperfine field experienced by the nuclear spin ... |
|
| High-Quality Manganese-Doped ZnSe Nanocrystals |
01-Jan-2001 |
6 pages |
| Authors:
T A Kennedy; D J Norris; Nan Yao; F T Charnock; NAVAL RESEARCH LAB WASHINGTON DC
|
| We demonstrate high-quality, highly fluorescent, ZnSe colloidal nanocrystals (or quantum dots) that are doped with paramagnetic Mn2+ impurities. We present luminescence, magnetic circular dichroism (MCD), and electron paramagnetic resonance (EPR) measurements to confirm that the Mn impurities are embedded inside the nanocrystal. Optical measurements show that by exciting the nanocrystal, efficient emission from Mn is obtained, with a quantum yield of 22% at 295 K and 75% below 50 K ... |
|
| Semimagnetic Resonant Tunneling Diodes for Electron Spin Manipulation |
23 JUN 2000 |
4 pages |
| Authors:
Th. Gruber; M. Keim; R. Fiederling; G. Reuscher; A. Waag; WUERZBURG UNIV (GERMANY F R) PHYSIKALISCHES INST
|
| Recently, efficient electrical injection of spin polarized electrons into GaAs bas been accomplished by using a semimagnetic II-VI single layer, namely BeMnZnSe, as a spin aligner. In such spin aligner materials. the orientation of the electron spins can only be controlled by varying the magnetic field. Here, we introduce an approach aiming at manipulating spins by an external voltage. For that we developed BeTe/ZnMnSe/BeTe semimagnetic resonant tunneling diodes as a ... |
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| Collective Behavior of the Interwell Excitons in Biased GaAs/AlGaAs Double Quantum Wells |
23 JUN 2000 |
1 pages |
| Authors:
V. B. Timofeev; A. V. Larionov; J. M. Hvam; C. B. Soerensen; RUSSIAN ACADEMY OF SCIENCES CHERNOGOLOVKA INST OF SOLID STATE PHYSICS
|
| Described phenomena are associated with the creation of a collective excitonic phase. Dielectric excitonic nature of this new phase is confirmed by its diamagnetic behavior and by Zeeman splittings in magnetic field parallel to the structure growth direction (Faraday geometry). Space coherence of collective excitonic phase is investigated and discussed. |
|
| Mesoscopic Superconductors in Proximity to Nanomagnets |
18 JUN 1999 |
4 pages |
| Authors:
V. T. Petrashov; I. A. Sosnin; I. Cox; A. Parsons; C. Troadec; LONDON UNIV (UNITED KINGDOM)
|
| We report a study of electron transport through mesoscopic superconducting (aluminum) wires with ferromagnetic (nickel) and superconducting electrodes in the temperature range of 0.28-1.5 K in magnetic fields up to 5 T. We observe spectacular changes in the differential voltage-current characteristics, dV/dI vs I. when the measuring current is injected from the ferromagnetic electrodes: the dV/dII curves become non-symmetric with respect to the current direction and show the regions with ... |
|
| Magnetic Field-Induced Type-I Type-II Transition in (ZuMu)Se/(ZaBe)Se Spin Superlattices |
18 JUN 1999 |
4 pages |
| Authors:
B. Koenig; U. Zehnder; D. R. Yakovlev; W. Ossau; T. Gerhard; RUSSIAN ACADEMY OF SCIENCES SAINT PETERSBURG IOFFE PHYSICAL-TECHNICAL INST
|
| We have performed a magnetooptical study on spin superlattice structures fabricated on the basis of (ZnMn)Se/(ZnBe)Se. The band alignment of a Zn(0.91)Mn(0.09)Se/ Zn(0.972)Be(0.028)Se superlattice was found to undergo a type-I to type-Il transition for one of the exciton spin component. This spin superlattice formation manifests itself in an asymmetric Zeeman splitting of a spatially direct exciton resulting from a spin dependent change of the exciton binding energy. A pronounced broadening ... |
|
| Electron Effective g Factor in Small Quantum Systems |
JUN 1998 |
4 pages |
| Authors:
E. L. Ivchenko; A. A. Kiselev; U. Roessler; RUSSIAN ACADEMY OF SCIENCES SAINT PETERSBURG IOFFE PHYSICAL-TECHNICAL INST
|
| The Zeenmn effect for 1D and 0D electron states has been considered theoretically. We have established the relation between the point symmetry of a low-dimensional system and properties of the g factor tensor g(sub alpha beta) from which, in particular, it turns out that the g factor in a cylindrical wire is isotropic (g(sub xx = g(sub yy) = g(sub zz)). The actual calculation of g( sub alpha beta) is ... |
|
| Non-Electro-Optic Methods of High Frequency Laser Modulation |
DEC 96 |
65 pages |
| Authors:
Joseph W. Darwood; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Two high frequency, non-electro optic methods for modulating the intensity of a laser are examined theoretically and experimentally. The first modulation technique makes use of the Zeeman effect. Under an applied DC magnetic field, a splitting into two lines or three lines occurs. Modulation rates of 200 MHz have been proven possible with this technique. In the second technique, the properties of self phase modulation of a monochromatic light are ... |
|
| Predictions of the Spectra of the Rare-Earth Ions Ce(3+) Through Yb(3+) in the Two Sites of Ca5(PO4)3F |
APR 95 |
72 pages |
| Authors:
Clyde A. Morrison; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The results of fitting the experimental data on Er(3+) in the two Ca2+ sites of Ca5(PO4)3F are used to predict the crystal-field parameters for the entire rare-earth series. These crystal-field parameters are then used along with the free-ion wavefunctions determined with aqueous parameters to determine a set of energy levels of the rare-earth ions Ce(3+) through Yb(3+) for both Ca(2+) sites (Cal with C(sub 3) symmetry and Ca2 with C(sub ... |
|
| Method and Apparatus for Locking Laser Wavelength to an Atomic Transition. |
14 FEB 1995 |
|
| Authors:
Stephen A. Miller; DEPARTMENT OF THE NAVY WASHINGTON DC
|
 | An apparatus and method for stabilizing laser light wavelength relative to a resonant optical absorption works with both continuous wave and pulsed lasers and employs the phenomenon of Zeeman energy level splitting to provide a error signal indicative of both the direction and magnitude of wavelength error. A laser system including a wavelength adjusting means produces laser light at a wavelength which differs by an adjustable amount from a resonant ... |
|
| Optical and Magnetic Resonance Investigations of 3d Ions in Single Crystal Hosts: Candidates for Tunable Solid-State Lasers |
25 APR 94 |
181 pages |
| Authors:
David J. Single; HARVARD UNIV CAMBRIDGE MA DEPT OF CHEMISTRY
|
| A comprehensive report is presented on EPR and correlated optical spectroscopic studies conducted in our laboratory on a new class of solid-state materials with potential utility as near IR lasers. All of the studied materials involve oxide host lattices (Silicates, vanadates, and germanates) doped with 3d transition metal-ions (chromium and manganese). The novelty of the materials is connected to the tetrahedral coordination and unusual oxidation state of the dopant ions. ... |
|
| Advances in Laser Cooling |
15 SEP 93 |
113 pages |
| Authors:
Harold J. Metcalf; STATE UNIV OF NEW YORK AT STONY BROOK
|
| Topics include beam profile flattening, quantum calculations, simplest laser cooling system, bichromatic cooling, quantum effects in helium cooling, and isotropic light cooling. |
|
| Low Temperature Transport Through a Quantum Dot: the Anderson Model Out of Equilibrium |
MAR 93 |
21 pages |
| Authors:
Y. Meir; N. Wingreen; P. Lee; CALIFORNIA UNIV SANTA BARBARA DEPT OF PHYSICS
|
| The infinite-U Anderson model is applied to non-equilibrium transport through a quantum dot containing two spin levels weakly coupled to two leads. At low temperatures, the Kondo peak in the equilibrium density of states is split upon the application of a voltage bias. The split peaks, one at the chemical potential of each lead, are suppressed by non-equilibrium dissipation. In a magnetic field, the Kondo peaks shift away from the ... |
|
| The Detection and Characterization of High Frequency and High Wavenumber Solar Oscillations |
JUN 92 |
131 pages |
| Authors:
David N. Fernandes; STANFORD UNIV CA DEPT OF PHYSICS
|
| Doppler shift measurements of the Na D1 absorption line have revealed solar oscillations in a new regime of frequency and wavenumber. Oscillations of vertical velocities in the temperature minimum and low chromosphere of the Sun are observed with frequencies ranging up to 9.5 mHz. There is no evidence for chromospheric modes of 3 minute period. This indicates that the chromosphere does not form a good cavity for acoustic waves. The ... |
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| Time-Resolved Hole-Burning in YLiF4:Er3+ With Zeeman Scanning, |
22 MAY 1992 |
|
| Authors:
Y. P. Wang; R. S. Meltzer; R. Wannemacher; R. M. Macfarlane; GEORGIA UNIV ATHENS DEPT OF PHYSICS AND ASTRONOMY
|
| We report the results of time-resolved optical holeburning of Er(3+) ions in YLiF4 (0.02%). In earlier work for H//c we described the time evolution of holes burned at 33kG using laser scanning over a frequency of 4OMHz and we reported, using larger scans, the occurrence of optical side holes. We now describe results for HIc with scans > 400 MHz using a new Zeeman technique for frequency scanning the optical ... |
|
| Blue Cesium Faraday and Voigt Filters |
14 MAY 92 |
20 pages |
| Authors:
J. Menders; P. Searcy; K. Roff; S. Bloom; E. Korevaar; THERMOTREX CORP SAN DIEGO CA
|
|
| Magnetically Suppressed 1.315 Micrometers Atomic Iodine Absorption |
SEP 88 |
74 pages |
| Authors:
Mark E. Daily; R. G. Highland; Daniel E. Johnson; G. D. Hager; L. Hanko; AIR FORCE WEAPONS LAB KIRTLAND AFB NM
|
| The influence of a magnetic field on absorption of 1.315 micrometers radiation by iodine atoms has been investigated using the output from a C3F7I photodissociation laser. Atomic iodine was created by thermal dissociation of molecular iodine in a sealed fused silica absorption cell. The cell was placed inside a solenoidal coil creating a longitudinal magnetic field. Absorption of 1.315 micrometers radiation by iodine atoms was reduced by the Zeeman splitting ... |
|
| Synthesis and Study of Materials for Superconducting Electronics |
27 MAR 88 |
|
| Authors:
P. M. Tedrow; R. Meservey; T. P. Orlando; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| Study of high-Tc superconductors in single-crystal and thin film form has begun. Investigation of semiconductor tunnel barriers has led to improvement of their theoretical description. Transport measurements of layered films of transition metal nitrides showed evidence of spin-orbit scattering and dimensional crossover effects. A technique for analyzing tunneling conductances to obtain the amount of Zeeman splitting using Fourier transforms has been developed and applied to V3Ga tunneling data. Spin-orbit scattering ... |
|
| Laser Induced Fluorescent Study of Relativistic Electron Beams |
JUN 87 |
|
| Authors:
Edward J. Yadlowsky; Robert C. Hazelton; HY-TECH RESEARCH CORP RADFORD VA
|
| The magnetic fields associated with a relativistic electron beam propagating in a gas provide information about the net current distribution in the beam and the stability of the beam with respect to hose, hollowing, and flute instabilities. In principle, these magnetic fields can be measured using Faraday rotation techniques, or by measuring the Zeeman splitting of atomic/ ionic transitions using emission spectroscopy. This work investigates the measurement of magnetic field ... |
|
| Symposium on Molecular Spectroscopy (41st) Held in Columbus, Ohio on 16- 20 June 1986 |
21 JUN 86 |
|
| Authors:
OHIO STATE UNIV COLUMBUS DEPT OF CHEMISTRY
|
| Partial contents: Infrared Spectroscopy of Molecular Ions, Evaluations of Molecular Constants--A continuing search for proper Procedures and Perspectives, Photothermal Methods for Analytical Laser Spectroscopy, A multiple Reflection Cell to Enhance Direct IR Absorption in a Collimated Molecular Beam, Refilling Transitions in Tea-Pumped Methanol Fir Lasers, Stark and Zeeman Effect of Ethylene Observed by Sub Doppler Infrared Spectroscopy, Infrared Diode Laser Spectroscopy of the Hydrogen Bifluoride Anion: FHF- and FDF-, High ... |
|
| Nonlinear Optical Studies of Rydberg Atoms Using Degenerate Four-Wave Mixing |
AUG 1984 |
|
| Authors:
J. F. Lam; R. A. McFarlane; D. G. Steel; HUGHES RESEARCH LABS MALIBU CA
|
| The spectral behavior of the third order nonlinear optical response of atomic sodium was studied. As a result, new kinds of frequency domain spectroscopy techniques were developed: nearly degenerate four-wave mixing, polarization nearly degenerate four-wave mixing, frequency domain three-state spectroscopy, and nonlinear Hanle effect in degenerate four-wave mixing. These techniques have provided new information on several areas of collision physics including: dephasing collisions (spectral broadening and frequency shift), velocity changing ... |
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| Zeeman Studies of Shallow Donors and Excitons in Quantum Wells |
MAR 1984 |
|
| Authors:
R. L. Greene; NEW ORLEANS UNIV LA
|
| A theoretical study has been made of the shallow donor and Wannier exciton within a one-dimensional quantum well. The variational method was used with a cylindrical Gaussian basis set. In order to facilitate comparison with future experimental measurements of excited states of these systems, an external magnetic field was assumed perpendicular to the interfaces between the barrier material and the well. Calculations reveal that the choice of matching conditions used ... |
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| Investigation of Nonlinear Optical Properties of Semiconductors |
23 FEB 1984 |
|
| Authors:
D. G. Seiler; NORTH TEXAS STATE UNIV DENTON CENTER FOR APPLIED QUANTUM ELECTRONICS
|
| Nonlinear optics is an increasingly interesting and exciting area of physics. Many nonlinear optical effects have been discovered and various nonlinear optical devices constructed from a wide variety of materials. In particular, small band gap semiconductors like InSb can have unique optical properties because of their small effective masses and direct band gaps. Unusual and often unexpected results are found in their nonlinear behavior--optical bistability, nonlinear refraction, laser pulse limiting ... |
|
| An Atmospheric Millimeter Wave Propagation Model |
DEC 1983 |
118 pages |
| Authors:
H. J. Liebe; NATIONAL TELECOMMUNICATIONS/INFORMATION ADMINISTRATION BOULDER CO INST FOR TELECOMMUNICATION SCIENCES
|
| The neutral atmosphere is characterized for the frequency range from 1 to 300 GHz as a nonturbulent propagation medium. Attenuation and propagation delay effects are predicted from meteorological data sets: pressure, temperature, humidity, suspended particle concentration, and rain rate. The physical data base of the propagation model consists of four terms: (a) resonance information for 30 water vapor and 48 oxygen absorption lines in the form of intensity coefficients and ... |
|
| Laser-Plasma Interaction Experiments and Diagnostics at NRL (Naval Research Laboratory) |
11 MAY 1983 |
|
| Authors:
B. H. Ripin; J. Grun; M. J. Herbst; S. T. Kacenjar; E. A. McLean; NAVAL RESEARCH LAB WASHINGTON DC
|
| Laser plasma interaction experiments have now advanced to the point where very quantitative measurements are required to elucidate the physic issues important for laser fusion and other applications. Detailed time-resolved knowledge of the plasma density, temperature, velocity gradients, spatial structure, heat flow characteristics, radiation emission, etc, are needed over tremendou ranges of plasma density and temperature. Moreover, the time scales are very short, aggrevating the difficulty of the measurements further. ... |
|
| High Resolution Laser Spectroscopy of Colour Centres |
21 DEC 1982 |
|
| Authors:
R. M. Macfarlane; R. T. Harley; R. M. Shelby; IBM RESEARCH LAB SAN JOSE CA
|
| The application of narrow band dye lasers to high resolution spectroscopy within the inhomogeneously broadened zero-phonon lines of colour centres is reviewed. Most work so far has centred on the use of holeburning which is exhibited by the majority of centres examined. This technique has been used to make detailed Stark and Zeeman effect measurements. In addition, optical coherent transients have been used to determined dephasing times and the results ... |
|
| Dual Cavity Laser Gyro. |
13 DEC 1982 |
|
| Authors:
Thomas G. Roberts; Thomas B. Honeycutt; DEPARTMENT OF THE ARMY WASHINGTON DC
|
| A laser gyro having two cavities which are physically separated so that neither mode volumes have any common parts. Each cavity supports a wave traveling in only one direction either clockwise or counter-clockwise. Other waves, which are normally set up in a ring laser gyro, are prevented by a reversed feedback mirror. The gyro produces two waves whose frequencies are shifted in opposite directions by rotation. Lock-in is not possible. ... |
|
| Semiconductor Spatial Light Modulators |
JUN 1982 |
|
| Authors:
Gianfranco Gerosa; Jose A. Maiz; Wisik Min; Stuart A. Collins Jr.; Marlin O. Thurston; OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS
|
| The objective of this research was to evaluate techniques for modulating or switching one beam of light with another. The processes investigated were free carrier Faraday rotation, sensor-controlled optical emission, modulation of magnetic bubble diameter, selective pumping of an excited states in garnet with circularly polarized light, and modulation of optical absorption in silicon by pumping hole states. In the last method a control beam of wavelength was used to ... |
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| The Atmospheric Propagation Medium between 45 and 75 GHz |
1982 |
|
| Authors:
Hans J. Liebe; INSTITUTE FOR TELECOMMUNICATION SCIENCES BOULDER CO
|
|
| Trapped Ion Research. Summary Questionnaire. |
30 APR 1981 |
|
| Authors:
Daniel J. Larson; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF PHYSICS
|
|
| Attenuation and Phase Delay of Radio Waves in Air Below 1000 GHZ for Heights 0 to 100 KM |
1981 |
|
| Authors:
Hans J. Liebe; NATIONAL TELECOMMUNICATIONS/INFORMATION ADMINISTRATION BOULDER CO INST FOR TELECOMMUNICATION SCIENCES
|
|
| Modeling Attenuation and Phase of Radio Waves in Air at Frequencies Below 1000 GHz |
10 DEC 1980 |
|
| Authors:
Hans J. Liebe; INSTITUTE FOR TELECOMMUNICATION SCIENCES BOULDER CO
|
|
| Laser Gyro Theory Extension. |
DEC 1980 |
|
| Authors:
Marlan O. Scully; ARIZONA UNIV TUCSON OPTICAL SCIENCES CENTER
|
| Three investigations have been completed under the contract entitled 'Laser Gyro Theory Extension,' as follows: (1) The accuracy of the Zeeman laser gyro (ZLAG) theory was tested by comparing its predictions with experimental results. (2) Other multioscillator approaches to solving the lock-in problem have been investigated. (3) Two earthbound experiments to test general and special relativity theories were designed, based on the Sagnac interferometer. (Author) |
|
| Optical Spectra of Yb(3+) in Crystals with Scheelite Structure. I. Explanation of the Spectra. |
SEP 1980 |
|
| Authors:
Edward A. Brown; HARRY DIAMOND LABS ADELPHI MD
|
| The optical and Zeeman spectra are reported for Yb(3+) in nine single crystals of the Scheelite family at temperatures varying between 1.9 and 300 K and impurity ion concentration varying between 0.05 and 4 percent. The scheelite crystals examined were CaWO4, CaMoO4, SrWO4, SrMoO4, PbWO4, PbM0O4, CdMoO4, BaWO4, and LiYF4. The Yb(3+) ion substitutes for the cation and experiences a crystalline electric field of S4 point symmetry. The spectra were ... |
|
| Possible Influence of Solar Rotation on Tropospheric Circulation. |
SEP 1980 |
|
| Authors:
John M. Wilcox; STANFORD UNIV CA INST FOR PLASMA RESEARCH
|
| A large-scale structure observed in the photospheric magnetic field is carried out into the helicopter by the solar wind. At earth the resulting interplanetary magnetic field has polarity away from the sun for several consecutive days followed by an abrupt reversal and several days with field polarity toward the sun. This section structure appears to be related to some effects in the tropospheric circulation. (Author) |
|
| What Causes the Warp in the Heliospheric Current Sheet |
31 JUL 1980 |
|
| Authors:
John M. Wilcox; Philip H. Scherrer; STANFORD UNIV CA INST FOR PLASMA RESEARCH
|
|
| Multioscillator Laser Gyro Study. |
JAN 1980 |
|
| Authors:
V. E. Sanders; LITTON SYSTEMS INC WOODLAND HILLS CA GUIDANCE AND CONTROL SYSTEMS DIV
|
| Parameter variation experiments were conducted and results are reported on the Litton IR and D developed LG2432 multioscillator laser gyro. The purpose of this collection of data is in its intended use as an aid in the advancement of a developing multioscillator theoretical model. The model predicts both the output intensities and oscillation frequencies of the various ring laser modes in this device. Therefore, the parameter variation experiments are concerned ... |
|
| Magnetic Field Induced Cross Relaxation between Two Different Spin Transitions of Triplet Coumarin. |
06 APR 1979 |
|
| Authors:
Christina L. Gniazdowski; William M. Pitts; M. A. El-Sayed; CALIFORNIA UNIV LOS ANGELES DEPT OF CHEMISTRY
|
| At certain magnetic fields, when the energy separations between the tau(x) - tau(y) spin levels and between the tau(y) - tau(z) levels of triplet coumarin become equal, intensity changes are observed in the phophorescence of coumarin doped in a single crystal of durene cooled to 1.6 K that can be attributed to cross relaxation (CR) between the tau(x) - tau(y) spin levels of one triplet coumarin molecule and the tau(y) ... |
|
| Measurement of Frequency of Light and its Application. |
01 AUG 1978 |
|
| Authors:
Ali Javan; Michael S. Feld; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF PHYSICS
|
| This three-year contract has covered many rich areas of physics. Measurement of the velocity of light provided equipment and techniques for studying the anomalous Zeeman effect. Several important theoretical studies on superradiance were conducted. The whole field of time delayed laser saturation spectroscopy was opened. A study has been made of the mechanism of optically pumping far infrared lasers. The metal-oxide-metal diode was analysed theoretically and results verified experimentally. Guidelines ... |
|
Reports by Keyword(s)
ZEEMAN EFFECT
