KEYWORDS: Far infrared lasers, High power lasers, Interferometers, Continuous wave operation, Diagnostics, Signal attenuation, Mirrors, Laser systems engineering, Waveguides, Optical benches
In order to measure the electron desity profile on the LHD, a 10-channel laser interferometer has been designed. For the diagnostic application, an optically pumped 119-μm CH3OH laser and a discharge pumped 195-μm DCN laser are under development.
Discharge pumped DCN-laser(195 gm) and CO2 laser pumped CH2F2(185 itm)- and CH3OH (119 gm)-lasers have been developed for plasma diagnostics on LHD. The systems and the characteristics of these lasers are reported.
A new power meter with a sensitive micro-calorimeter has been developed to measure the absolute power of FIR laser. Using this power meter, a calibration of a Scientech power and energy meter of 36 series has been carried out for 337 μm wavelength.
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