Stabilization of simultaneously oscillated 48- and 57-μm CH3OD lasers for plasma diagnostics
Infrared, Millimeter, and Terahertz waves（2014）
Abstract
A two-color interferometer and polarimeter using simultaneously oscillated 48- and 57-μm CH3OD lasers pumped by a 9R(8) CO2 laser have been developed for future plasma diagnostics. Using a frequency-stabilized pump CO2 laser and a twin type far-infrared (FIR) laser, the output power and the beat frequency have been stabilized by controlling the FIR laser cavity with a stepper motor. The stable two-color laser oscillation was enabled. The output power and beat frequency stabilities of the 48-μm laser were ±2.8 %/hour and 600±18 kHzp-p/hour, respectively. The performances of the 57-μm laser were ±3.0 %/hour and 1200±18 kHzp-p/hour.
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Key words
carbon compounds,hydrogen compounds,interferometers,laser frequency stability,plasma diagnostics,polarimeters,stepping motors,submillimetre wave lasers,CO2,FIR laser cavity control,beat frequency stability,frequency-stabilized pump laser,output power,plasma diagnostics,polarimeter,simultaneously oscillated laser pumped stabilization,size 48 mum,size 57 mum,stable two-color laser oscillation,stepper motor,twin type far-infrared laser,two-color interferometer
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