Title :
Narrow bandwidth emission from a mirrorless, far infrared, 13 CH3F laser
Author :
Evangelides, S.G., Jr. ; Carson, L. ; Danly, B.G. ; Temkin, R.J.
Author_Institution :
Dept. of Phys., MIT, Cambridge, MA, USA
fDate :
1/1/1988 12:00:00 AM
Abstract :
Frequency tuning and linewidth measurements are reported for a pulsed, mirrorless, kilowatt-power-level, far-infrared (FIR) 13 CH3F laser operating at 245 GHz. The pump laser is an etalon tunable, single-mode CO2 TEA laser. The FIR frequency spectrum was measured with 2.5-MHz resolution on individual 100-ns laser output pulses using harmonic mixing techniques. The linewidth of the amplified spontaneous emission was found to be surprisingly narrow, about 15 MHz. Frequency tuning of the FIR laser, as the pump laser frequency is tuned, is nonlinear, possibly due to inhomogeneous broadening of the gain by the K-level substructure of the rotational states. These results indicate that heterodyne receivers capable of single-shot frequency measurements can be important tools for investigating the properties of Raman FIR lasers
Keywords :
gas lasers; laser tuning; laser variables measurement; molecular spectral line breadth; organic compounds; 100 ns; 245 GHz; CO2; Raman FIR lasers; amplified spontaneous emission; etalon tunable laser; fluoromethane laser; frequency tuning; harmonic mixing; heterodyne receivers; laser pulses; linewidth measurements; pulsed mirrorless FIR laser; pump laser; single-mode CO2 TEA laser; single-shot frequency measurements; Bandwidth; Finite impulse response filter; Frequency measurement; Laser excitation; Laser tuning; Optical pulses; Pulse amplifiers; Pulse measurements; Pump lasers; Tunable circuits and devices;
Journal_Title :
Quantum Electronics, IEEE Journal of
