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Simultaneously oscillated 48-μm and 57-μm CH3OD lasers pumped by a 9R(8) CO2 laser have been developed for fusion plasma diagnostics. A back reflection from an optically pumped far-infrared (FIR) laser cavity affects not only the FIR laser stability but also the pump CO2 laser stability. The back reflection has been reduced by an optical isolator using a quarter-wave plate and an absorbing thin-film...
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...
A two color far-infrared (FIR) laser interferometer and polarimeter using 5.2- and 6.3-THz CH3OD lasers pumped by a 9R(8) CO2 laser has been developed for future plasma diagnostics. The pump 9R(8) CO2 laser has been stabilized by an external Stark-cell modulation. The performances are the power stability of 108 ± 0.6 W/hour and the frequency stability of ± 230 kHzp-p/hour at the line center.
A two color far-infrared (FIR) laser interferometer of beat modulation type using 48- and 57-mum CH3OD lasers pumped by 9R(8) CO2 laser has been developing for plasma diagnostics. The pump 9R(8) CO2 laser frequency, 48- and 57-mum CH3OD laser outputs and FIR beat frequency have been stabilized preliminary. The power stability of pump CO2 laser of < plusmn 0.6 % and the frequency stability of <...
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