Optical pumps for organic dye lasers.
Low energy ultrafast flashlamp systems as optical pumps for lasers using fast decaying fluorescent materials /organic dyes/
Ceccon, H. L.↗
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Quantum mechanical features of optically pumped CW FIR lasers
Quantum mechanical predictions for the gain of an optically pumped CW FIR laser are presented for cases in which one or both of the pump and FIR transitions are pressure or Doppler broadened. The results are compared to those based on the rate equation model. Some of the quantum mechanical predictions are verified in CH3OH.
Seligson, D.↗
Application of optical pumping techniques to studies of geomagnetic gradients - The particular case of ''seaside'' effect
Optical pumping magnetometer for studying geomagnetic gradients
Mosnier, J.↗
Pressure effects on the frequency of continuous-wave optically pumped far-infrared lasers
The frequency of the 170.6-micron CW CH3OH optically pumped laser emission has been remeasured at different pressures without observing the pressure shift observed by Lawandy and Koepf (1980). The far-infrared frequency was synthesized with two stabilized CO2 lasers. No measurable pressure shift over the operating pressure range of the laser was observed, and the frequency was confirmed to be 1 757 526.3 MHz. However, competing lasing lines were found to produce spurious effects on the frequency. These effects may explain the apparent shifts.
Inguscio, M.↗
A pulsed cesium spectral lamp for optical pumping studies
Two-bulb switchable pulsed spectral lamp with Cs and Xe for optical pumping studies
Dilavore, P.↗
Possibility of a unidirectional laser amplifier produced by monochromatic optical pumping of a coupled Doppler-broadened transition
Unidirectional gas laser amplifier using monochromatic optical pumping of coupled Doppler broadened transition
Feld, M. S.↗
Optically pumped submillimeter gas lasers and the prospects for constructing space-qualifiable LO systems
An optically pumped, submillimeter laser operating in the 500 micron (600 GHz) to 100 micron (3 THz) spectral range is the primary and, at present, the only available local oscillator (LO) source for laboratory and astronomical heterodyne applications for this wavelength region. A short review of the state-of-the-art of submillimeter lasers as LO sources, with an emphasis given to receiver systems designed for airborne heterodyne observations, is presented. The characteristics and prospects for constructing a space-qualifiable laser LO system will also be given.
Chin, Gordon↗
Performance of the new Efratom optically pumped rubidium frequency standards and their possible application in space relativity experiments
The characteristics of Efratom optically pumped rubidium frequency standards are discussed. The Efratom units were compared with cesium beam and hydrogen maser standards and showed a stability of approximately 5 times 10 to the minus 12th power over two one-week periods. Dependency of frequency upon the environmental parameters of pressure, magnetic field, temperature, supply voltage, and acceleration was measured. A package of three units with automatic phase comparison and recording was designed and constructed to allow a measurement of relativistic effects on time with high accuracy during space missions.
Alley, C. O.↗
Design and analysis of optically pumped submillimeter waveguide maser amplifiers and oscillators
The design and experimental measurements are described of an optically pumped far-infrared (FIR) waveguide maser; preliminary measurements on a FIR waveguide amplifier are presented. The FIR maser was found to operate satisfactorily in a chopped CW mode using either methanol (CH3OH) or acetonitrile (CH3CN) as the active molecule. Two other gases, difluoroethane and difluoroethylene, produced an unstable output with high threshold and low output power when operated in the chopped CW mode. Experimental measurements include FIR output versus cavity length, output beam pattern, output power versus pressure, and input power. The FIR output was the input to an amplifier which was constructed similar to the oscillator. An increase of 10% in output power was noted on the 118.8 microns line of methanol.
Galantowicz, T. A.↗
Optically pumped resonance magnetometer for determining vectoral components in a spatial coordinate system Patent
Design and development of optically pumped resonance magnetometer for determining vectoral components in spatial coordinate system
Rempel, R. C.↗
Relaxation oscillations in optically pumped molecular lasers
The observation of relaxation oscillations in both the (C-13)H3F and (C-12)H3F optically pumped lasers is reported. Expressions are derived for the oscillation frequency and its temperature and pressure dependences using a four-level rate equation model. Excellent agreement between measured frequencies and the theory presented is observed. Models are considered for using this phenomenon to determine the rotational and vibrational relaxation mechanisms of the laser gases.
Lawandy, N. M.↗
Hyperfine spectroscopy using transverse modulated optical pumping
Population inversion is observed between the field-independent ground hyperfine states of Rb-87 when using an optical pumping technique which is applicable to a large number of species of atoms and ions. Inversion occurs upon a coherent transfer of angular momentum to the Rb-87 spin system from circularly polarized light propagating in a transverse direction to a magnetic field. Coherence is established by modulating, at certain frequencies, the light intensity or magnetic-field strength.
Hughes, W. M.↗
Pressure shift in the 170-micron emission of the CW optically pumped CH3OH laser
Pressure shifts of +15 MHz torr were observed in 16(8)-16(7) 170-micron CW CH3OH optically pumped laser emission. The experiments were performed using a harmonic mixing technique in a Schottky diode. The results are explained in terms of a second-order dipole-dipole interaction in a statistical formulation.
Lawandy, N. M.↗
Laser Induced Optical Pumping Measurements of Cross Sections for Fine and Hyperfine Structure Transitions in Sodium Induced by Collisions with Helium Argon Atoms
Optical pumping of the ground states of sodium can radically alter the shape of the laser induced fluorescence excitation spectrum, complicating measurements of temperature, pressure, etc., which are based on these spectra. Modeling of the fluorescence using rate equations for the eight hyperfine states of the sodium D manifolds can be used to quantify the contribution to the ground state pumping of transitions among the hyperfine excited states induced by collisions with buffer gas atoms. This model is used here to determine, from the shape of experimental spectra, cross sections for (Delta)F transitions of the P(sub 3/2) state induced by collisions with helium and argon atoms, for a range of values assumed for the P(sub 1/2), (Delta)F cross sections. The hyperfine cross sections measured using this method, which is thought to be novel, are compared with cross sections for transitions involving polarized magnetic substates, m(sub F), measured previously using polarization sensitive absorption. Also, fine structure transition ((Delta)J) cross sections were measured in the pumped vapor, giving agreement with previous measurements made in the absence of pumping.
Dobson, Chris C.↗
Optical pumping and the D-line ratio of Comet 1962-III.
Comet 1962-III Na D line ratio from spectral observations, discussing optical pumping mechanism by solar circularly polarized radiation under magnetic field
Kovar, N. S.↗
Electron-spin memory in the optical-pumping cycle of F centers in alkali halides and electron-spin resonance of the relaxed excited state.
Electron spin memory in optical pumping cycle of potassium halides F centers, measuring relaxed excited state g factors and spin resonance line widths
Mollenauer, L. F.↗
Laser oscillation and anisotropic gain in the 1 to 0 vibrational band of optically pumped HF gas.
P-branch laser oscillations have been observed in the v = 1 to v = 0 band of HF gas, optically pumped by R-branch lines of a pulsed HF laser. The observed gains are large (greater than 10% per cm), and the conversion efficiencies are high. In a ring cavity, the system shows directional gain anisotropy characteristic of unidirectional laser amplifiers proposed recently.
Skribanowitz, N.↗
Laser-Induced Optical Pumping Measurements of Cross Section for Fine- and Hyperfine-Structure Transitions in Sodium Induced by Collisions with Helium and Argon Atoms
Optical pumping of the ground states of sodium can radically alter the shape of the laser-induced fluorescence excitation spectrum, complicating measurements of temperature, pressure, etc., which are based on these spectra. Modeling of the fluorescence using rate equations for the eight hyperfine states of the sodium D manifolds can be used to quantify the contribution to the ground state pumping of transitions among the hyperfine excited states induced by collisions with buffer gas atoms. This model is used here to determine, from the shape of experimental spectra, cross sections lor DELTA.F transitions of the P(sub 3/2) state induced by collisions with helium and argon atoms, for a range of values assumed for the P(sub 1/2), DELTA.F cross sections. The hyperfine cross sections measured using this method, which to our knowledge is novel, are compared with cross sections for transitions involving polarized magnetic substates m(sub F) measured previously using polarization sensitive absorption. Also, fine-structure transition cross sections were measured in the pumped vapor, giving agreement with previous measurements made in the absence of pumping.
Dobson, Chris C.↗