Coherent light generators – Particular beam control device – Modulation
Patent
1989-12-05
1991-07-23
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Modulation
372 4, 372 29, 372 20, H01S 310
Patent
active
050349520
ABSTRACT:
A Stark-tuned laser operating in the 119 micron line of CH.sub.3 OH has an output power of several tens of milliwatts at 30 Watts of pump power while exhibiting a doublet splitting of about ten MHz with the application of a Stark field on the order of 500 volts/cm. This output power allows for use of the laser in a multi-channel interferometer, while its high operating frequency permits the interferometer to measure rapid electron density changes in a pellet injected or otherwise fueled plasma such as encountered in magnetic fusion devices. The laser includes a long far-infrared (FIR) pyrex resonator tube disposed within a cylindrical water jacket and incorporating charged electrodes for applying the Stark field to a gas confined therein. With the electrodes located within the resonator tube, the resonator tube walls are cooled by a flowing coolant without electrical breakdown in the coolant liquid during application of the Stark field. Wall cooling allows for substantially increased FIR output powers. Provision is made for introducing a buffer gas into the resonator tube for increasing laser output power and its operating bandwidth.
REFERENCES:
patent: 3842367 (1974-10-01), Schlossberg
patent: 3921099 (1975-11-01), Abrams et al.
Design of Molecular Fir Lasers Frequency Tunable by Stark Effect: Electric Breakdown of CH.sub.3 OH, CH.sub.3 F, CH.sub.3 I and CH.sub.3 CN/Bionducci et al., Infrared Physics, 1979, pp. 297-308.
Multichannel Far-Infrared Laser Interferometer for Electron Density Measurements on the Tokamak Fusion Test Reactor / Mansfield et al., Applied Optics, vol. 26, pp. 4469-4474, Oct. 15, 1987.
Guttadora Lawrence J.
Mansfield Dennis K.
Vocaturo Michael
Albrecht John M.
Cordell Helen S.
Jr. Leon Scott
Moser William R.
The United States of America as represented by the United States
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