Simple, high-performance type II β-BaB2O4 optical parametric oscillator

Creators: Wu, Sheng; Blake, Geoffrey A.; Sun, Zhaoyang; Ling, Jiwu

Abstract

A visible /near-IR optical parametric oscillator (OPO) based on type II phase matching in β-BaB2O4 (BBO) is described. Pumped at 355 nm, this OPO covers 410-2500 nm completely with a single set of standard Nd:YAG cavity optics. The output efficiency is >25 %, the linewidth of the OPO is narrower than 1 -2 cm^-1 without the use of gratings or etalons, and the signal-beam divergence is <400 µrad. Three type I BBO doubling crystals are used to extend the tuning range from 208 to 415 nm. Doubling efficiencies as high as 40% are easily obtained. The reasons for the high doubling and overall system efficiency are discussed.

Additional Information

© 1997 Optical Society of America Received 3 October 1996; revised manuscript received 21 January 1997. This research was supported in part by a U.S. Defense Advanced Research Project Agency/U.S. Office of Naval Research University Research Initiative grant to the California Institute of Technology. The authors also gratefully acknowledge additional instrumentation support from the Infrared, Submillimeter, and Radio Astronomy/Exobiology Programs at NASA and the Experimental Physical Chemistry Program of the U.S. National Science Foundation.

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