Tunable narrow-band cw difference-frequency generation at 8.7 μm was demonstrated in silver gallium selenide (AgGaSe2) at room temperature. The crystal was pumped by an injection-seeded Er/Yb-codoped fiber amplifier at 1.554 μm and a fiber-coupled diode-pumped monolithic ring Nd:YAG laser at 1.319 μm. The difference-frequency output was used for high-resolution spectroscopy of sulfur dioxide (SO2).
© 1996 Optical Society of America
K. P. Petrov, R. F. Curl, F. K. Tittel, and L. Goldberg, "Continuous-wave tunable 8.7-µm spectroscopic source pumped by fiber-coupled communications lasers," Opt. Lett. 21, 1451-1453 (1996)