Abstract

A high-resolution cw spectrometer based on difference frequency generation (DFG) in a 20-mm-long AgGaS2 crystal pumped by two stabilized single-frequency cw dye–Ti:sapphire lasers is described. Experiments performed with a Rhodamine 6G and DCM dye laser combination pumped by a 20-W argon laser are reported. Informed radiation is generated from 7 to 9 μm with an ultranarrow linewidth (<0.5 MHz) and an output power 1 μW by making use of 90° type I phase matching. The performance of the DFG laser spectrometer is evaluated by using a portion of the ν2 band of NH3 near 1177 cm−1.

© 1992 Optical Society of America

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