Compact high-performance tandem optical parametric oscillator for the 8- to 12-um band

Yosi Ehrlich; Shlomo Fastig; Shaul Pearl; Gidon Cinader

doi:10.1117/12.452787

9 January 2002 Compact high-performance tandem optical parametric oscillator for the 8- to 12-μm band

Yosi Ehrlich, Shlomo Fastig, Shaul Pearl, Gidon Cinader

Proceedings Volume 4484, Lidar Remote Sensing for Industry and Environment Monitoring II; (2002) https://doi.org/10.1117/12.452787
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

A compact IR transmitter for the 8-12 micrometers atmospheric window is presented. The transmitter consists of two optical parametric oscillators (OPOs) in series, pumped by a 1.064 micrometers Nd:YAG laser. The first conversion stage is a double-pass non-critically phase-matched KTP OPO. A singly resonant configuration is used - the signal at 1.574 micrometers is resonated and coupled out with a 73 percent reflectivity output mirror. The first OPO's signal serves as a pump for a double-pass type I phase-matched AgGaSe2 OPO. This second OPO resonates the signal and couples out the idler at 8-11 micrometers . We eliminate high oscillating intensities inside the cavity by means of a low feedback. The low feedback causes a high threshold level, but have a minor influence on the total efficiency. Pumped by 6.5mJ at 1.574 micrometers , the AgGaSe2 OPO produced up to 0.5mJ at 8.5 micrometers , with beam quality of M² equals 4-5 and spectral width of 4-5cm^-1. Small physical dimensions, simplicity, and fairly good stability, makes this tandem OPO system usable for remote sensing applications. The described system is currently used for laboratory aerosol backscatter measurements.

Citation Download Citation

Yosi Ehrlich, Shlomo Fastig, Shaul Pearl, and Gidon Cinader "Compact high-performance tandem optical parametric oscillator for the 8- to 12-μm band", Proc. SPIE 4484, Lidar Remote Sensing for Industry and Environment Monitoring II, (9 January 2002); https://doi.org/10.1117/12.452787

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