Title :
Improving the power and spectral performance of a 27-33 THz AgGaS 2 difference-frequency spectrometer
Author :
Kaing, T. ; Zondy, Jean-Jacques ; Yelisseyev, A.P. ; Lobanov, S.I. ; Isaenko, Ludmila I.
Author_Institution :
Bur. Nat. de Metrol., Obs. de Paris, Meudon, France
fDate :
4/1/1999 12:00:00 AM
Abstract :
Progress toward the achievement of a compact, sub kilohertz resolution difference-frequency spectrometer to probe narrow saturated molecular transitions in the 9-11 μm range is reported. The spectrometer, presently generating 40 nW of infrared (IR) power, uses a type-I cut AgGaS2 crystal located in a dual-cavity resonator design. A frequency-stabilized all-diode-laser setup was implemented to obtain the required mid-IR spectral purity and frequency tuning range. Further experimental investigations show that a type-II phase-matched AgGaS2 crystal or a walkoff-compensated, two-crystal device would yield at least two times larger conversion efficiency than type-I cut samples. These improvements should help to reach the goal of the microwatt-level output for the IR radiation
Keywords :
gallium compounds; infrared spectrometers; optical frequency conversion; optical phase matching; silver compounds; 27 to 33 THz; 40 nW; AgGaS2; conversion efficiency; difference-frequency spectrometer; dual cavity resonator; frequency tuning; frequency-stabilized all-diode-laser; mid-IR spectral purity; molecular transition; optical frequency metrology; type-I cut AgGaS2 crystal; type-II phase-matched AgGaS2 crystal; walkoff-compensated two-crystal device; Diode lasers; Frequency conversion; Infrared spectra; Laser tuning; Lasers and electrooptics; Metrology; Optical resonators; Optical saturation; Power generation; Spectroscopy;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
