Results 271 to 280 of about 43,952 (314)

Resonant pumping far-infrared NH3 laser

Applied Physics B Photophysics and Laser Chemistry, 1981
A far-infrared (FIR) NH3 laser was resonantly pumped with a line-tunable infrared (IR) NH3 laser. The number of the observed FIR laser lines amounted to 33. Most of them belonged toaR(J,K) rotation-inversion transition in (0, 1, 0, 0) vibrational state.
N. Yamabayashi, K. Fukai, K. Miyazaki, K. Fujisawa   +3 more
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High Power Far-Infrared Lasers

SPIE Proceedings, 1986
Recently, there has been significant progress made in the attainment of very high c.w. power levels from optically pumped FIR lasers. These successes have relied on just a few power enhancement techniques which have been applied in the presence of high pump power. Power levels approaching 1 Watt have been observed on a few particularly strong lines.
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FAR Infrared Laser Assignments For Methylamine

SPIE Proceedings, 1988
High-resolution FTIR spectroscopy of the C-N stretching band of CH3NH2 has permitted location of several coincidences with CO2 laser lines, and identification of FIR laser transitions optically pumped by these lines. With the use of previous FIR spectroscopic results, it has been possible to form closed frequency combination loops to support the ...
R. M. Lees, W. Lewis-Bevan
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Far infrared Cherenkov free electron laser

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1988
Abstract The design parameters for a tunable 100 to 1000 μm Cherenkov free electron laser are discussed. The device consists of two parallel metallic plates, one of which is lined with dielectric film of between 25 to 100 μm thickness, driven by a 400 to 600 kV, 10 A, several microsecond long electron beam.
Eusebio Garate, Randall Cherry, Amnon Fisher   +2 more
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Tunable Far Infrared Semiconductor Lasers

Physica Scripta, 1987
A review of recent investigations on tunable far infrared semiconductor lasers on hot holes in Ge are given. This laser operates due to inverted hot hole distributions caused by the accumulation of carriers in crossed E and B fields in special regions of the momentum space. A radiative transition responsible for the simulated emission is the transition
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Far-Infrared Laser Diagnostics in EAST

Plasma Science and Technology, 2011
Structure, improvements and experiment results of a vertical three-channel far- infrared (FIR) hydrogen cyanide (HCN) laser interferometer, operated routinely in EAST to measure the electron density profile, are presented. Moreover, a five-channel deuterium cyanide (DCN) laser interferometer was developed successfully.
Nan Shi, Xiang Gao, Yinxian Jie, Shoubiao Zhang, Long Zeng, Erhui Wang, Yao Yang, Zixi Liu   +7 more
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Compact far-infrared free-electron laser

SPIE Proceedings, 1991
A free-electron laser enclosed in a waveguide of small transverse dimension may offer the opportunity to develop a compact source of coherent radiation in the far-infrared (100 (mu) - 100 (mu) ) region of the spectrum. The presence of the waveguide significantly affects the operation of the laser, qualitatively altering its spontaneous emission ...
Sally K. Ride, W. Golightly
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High power optically pumped far infrared lasers∗

Infrared Physics, 1976
Abstract A review of operating principles and achieved characteristics of high power methyl fluoride lasers at λ = 496 μm is presented. In addition, a novel linear pumping scheme is described which allows direct amplification of radiation from a narrow bandwidth (
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Optically Pumped Far-Infrared Ammonia Lasers

1984
NH3 is one of the spectroscopically best studied molecules which also has properties uniquely favourable for optically pumped lasers: 1) high permanent dipole moment, 2) high rotational constant, 3) inversion splitting of the ground state energy levels in the 1 cm wavelength range.
C. O. Weiss, M. Fourrier, C. Gastaud, M. Redon   +3 more
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One watt, far infrared CH3OH laser

Optics Communications, 1975
Abstract Peak powers near 1 watt have been observed on the CH 3 OH laser line at 570.5 μm as well as on each of three new CH 3 OH laser lines produced by pumping a far infrared guided wave cavity with a 0.5 MW helical CO 2 -TEA laser. The new lines have wavelengths of 58.1, 65.1 and 451.9 μm.
Jerald R. Izatt, Brent L. Bean, George F. Caudle   +2 more
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