Title :
Compact, broadly tunable mid-IR source for the spectroscopic investigation of molecular reference lines in the 27 to 33 THz range
Author :
Kaing, T. ; Zondy, J.-J. ; Yelisseyev, A. ; Lobanov, S. ; Isaenko, L.
Author_Institution :
Lab. Primaire du Temps et des Frequences, Obs. de Paris, Meudon, France
Abstract :
We report on the improvement of a tunable diode-laser-based difference-frequency spectrometer using AgGaS2 nonlinear crystal. This spectrometer is being developed as an alternative to CO 2 laser spectrometers in the 9 μm to 11 μm range. We use a type-II cut crystal as a part of the improvement compared to a type-I cut, which was used in our preliminary set-up. Using a Fabry-Perot cavity to enhance the 780-nm power (35 mW in front of the cavity) and 120 mW of the 843-nm radiation, 30-nW power of the tunable 10-μm radiation is detected. This power level is enough to investigate the linear absorption spectroscopy of SF6. Doppler limited spectra over 2 GHz are recorded, showing the wide tunability of the spectrometer
Keywords :
Doppler measurement; Fabry-Perot resonators; frequency standards; gallium compounds; infrared sources; infrared spectra; infrared spectroscopy; laser tuning; optical frequency conversion; optical materials; optical phase matching; optical variables measurement; silver compounds; spectroscopic light sources; sulphur compounds; ternary semiconductors; 10 mum; 120 mW; 2 GHz; 27 to 33 THz; 30 nW; 35 mW; 780 nm; 843 nm; 9 to 11 mum; AgGaS2; AgGaS2 nonlinear crystal; CO2 laser spectrometers; Doppler limited spectra; Fabry-Perot cavity; SF6; compact broadly tunable mid-IR source; linear absorption spectroscopy; molecular reference lines; power level; spectroscopic investigation; tunable diode-laser-based difference-frequency spectrometer; type-I cut crystal; type-II cut crystal; Diode lasers; Frequency; Laser excitation; Laser transitions; Laser tuning; Lasers and electrooptics; Pump lasers; Spectroscopy; Sulfur hexafluoride; Tunable circuits and devices;
Conference_Titel :
Frequency and Time Forum, 1999 and the IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999 Joint Meeting of the European
Conference_Location :
Besancon
Print_ISBN :
0-7803-5400-1
DOI :
10.1109/FREQ.1999.841409
