Abstract

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 high-resolution 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.

© 1992 Optical Society of America

Continuous-wave infrared laser spectrometer based on difference frequency generation in AgGaS₂ for high-resolution spectroscopy

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