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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 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 <...
A far-infrared (FIR) laser wavelength has been determined from refractive index of silicon with high resistivity (~2.8 kOmega-cm). A wavelength of a 48-mum CH3OD laser pumped by continuous wave (cw) 9R(8) CO2 laser has been measured at five significant figures. The wavelength and the refractive index are 47.661 plusmn 0.005 mum and 3.4147 at 9.6degC, 3.4164 at 19.4degC, and 3.4180 at 28.8degC. A known...
Simultaneously oscillated multi-line FIR lasers from a single FIR laser cavity pumped by two wavelength CO2 lasers have been developed for plasma diagnostics and the other applications. We have obtained simultaneous oscillations as following : (i) 60.5- and 118.8 mum-CH3OH lasers from pumping by 9R(18) CO2 laser and 9P(36) CO2 laser, (ii) 70.5- and 118.8-mum CH3OH lasers from pumping by 9P(34) CO2...
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