Improved performance of a continuous-wave (cw) laser spectrometer for Doppler-limited infrared spectroscopy of molecules based on difference-frequency generation (DFG) in AgGaS2 has been achieved. The spectrometer was configured to generate continuous scans of up to 1 cm-1 from 1550 to 2100 cm-1. An absolute precision of ˜6 × 10-3 cm-1 with a resolution of better than 1.0 MHz (3.3 × 10-5 cm-1) was achieved. Infrared powers of ˜20 μW were obtained by employing 90° Type I phase matching in a 45-mm-long AgGaS2 crystal. The highresolution characteristics of the DFG spectrometer were evaluated by using H2O and N2O spectra. Preliminary infrared kinetic spctroscopy results involving the detection of transient CO radicals from 193-nm acetone photodissociation are also reported.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of the Optical Society of America B: Optical Physics|
|State||Published - Nov 1992|
ASJC Scopus subject areas
- Statistical and Nonlinear Physics
- Atomic and Molecular Physics, and Optics