Demonstration of a high power 1.5344 um output Nd:YAG pumped OPO

Michael D. Wojcik; Robert J. Foltynowicz

doi:10.1117/12.881704

21 February 2011 Demonstration of a high power 1.5344 μm output Nd:YAG pumped OPO

Michael D. Wojcik, Robert J. Foltynowicz

Proceedings Volume 7917, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X; 79171Y (2011) https://doi.org/10.1117/12.881704
Event: SPIE LASE, 2011, San Francisco, California, United States

Abstract

A high output power, eye-safe, lidar transmitter based on a KTA optical parametric oscillator (OPO) was demonstrated. The OPO was based on a two crystal, doubly resonant, non-critically phase-matched, KTA ring cavity. An injection seeded, 7ns, 30Hz, flashlamp-pumped, Q-switched Nd:YAG laser was used to pump the OPO. The OPO converted the 1064nm pump beam into a 1533nm signal wave and 3475nm idler wave. In addition to demonstrating a high power OPO system, we investigated the effects of seeding the pump laser on the OPO's conversion efficiency, oscillation threshold, maximum signal power, and beam quality. The power conversion efficiency between the signal and the injection seeded pump was 22% with an oscillation threshold of 104MW/cm² (500mJ) and a maximum signal power of 6.44W (215mJ). The power conversion efficiency between the signal and the unseeded pump was 24% with an oscillation threshold of 77MW/cm² (367mJ) and a maximum signal power of >7W (243mJ). When the pump laser was seeded, the full angle divergence improved by nearly a factor of five.

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Michael D. Wojcik and Robert J. Foltynowicz "Demonstration of a high power 1.5344 μm output Nd:YAG pumped OPO", Proc. SPIE 7917, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X, 79171Y (21 February 2011); https://doi.org/10.1117/12.881704

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KEYWORDS

Optical parametric oscillators

Nd:YAG lasers

Crystals

LIDAR

Reflectivity

Laser damage threshold

Prisms

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