Narrow bandwidth emission from a mirrorless, far infrared, /sup 13/CH/sub 3/F laser

Journal Article · Fri Jan 01 04:00:00 EST 1988 · IEEE J. Quant. Electron.; (United States)

DOI:https://doi.org/10.1109/3.99· OSTI ID:5020609

Evangelides, Jr, S G; Carson, L; Danly, B G; Temkin, R J

Frequency tuning and linewidth measurements are reported for a pulsed, mirrorless, kW power level, far infrared (FIR) /sup 13/CH/sub 3/F laser operating at 245 GHz. The pump laser is an etalon tunable, single-mode CO/sub 2/ 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 (ASE) was found to be surprisingly narrow, about 15 MHz, much narrower than the homogeneous linewidth (on the order of 200 MHz), and narrower than previously reported measurements made with scanning Fabry-Perot interferometers, which average over many pulses. 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 KAPPA-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.

• Research Organization: Plasma Fusion Center and the Dept. of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139 (US)
• OSTI ID: 5020609
• Journal Information: IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. QE-24:1; ISSN IEJQA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ELECTROMAGNETIC RADIATION
FAR INFRARED RADIATION
FREQUENCY RANGE
GAS LASERS
GHZ RANGE
GHZ RANGE 100-1000
INFRARED RADIATION
LASERS
LINE WIDTHS
MEASURING METHODS
MOLECULES
NONLINEAR OPTICS
OPTICS
PULSES
RADIATIONS
TUNING