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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...
Multi-line far-infrared (FIR) gas lasers from a single laser cavity have been development in order to apply ITER diagnostics. By using two pump CO2 lasers with different wavelength and mixed gas of CH3OH and CH3OD, we succeeded in the simultaneous oscillations of three-color FIR lasers of 48, 57, 119 µm in wavelength.
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