UV by the fourth harmonic generation of compact side-pumped Yb:YAG laser emission

Brian Cole; Chris McIntosh; Alan Hays; Tom Dilazaro; Lew Goldberg

doi:10.1117/12.2213452

16 March 2016 UV by the fourth harmonic generation of compact side-pumped Yb:YAG laser emission

Brian Cole, Chris McIntosh, Alan Hays, Tom Dilazaro, Lew Goldberg

Proceedings Volume 9726, Solid State Lasers XXV: Technology and Devices; 972623 (2016) https://doi.org/10.1117/12.2213452
Event: SPIE LASE, 2016, San Francisco, California, United States

Abstract

We present a compact, side pumped passively Q-switched Yb:YAG laser that was operated in a burst mode with pump durations of 2-4 ms at low duty cycles. Intra-pump pulse Q-switched pulse repetition frequencies varied from 5-20 kHz depending on the transmission of the Cr:YAG saturable absorber, which was varied from 70% to 94%. Pump duration, pulse repetition frequency and output coupler reflectivity were optimized to yield maximum Yb:YAG laser average power and laser efficiency, while providing sufficient peak intensity, typically 0.3-1 MW, to enable efficient forth harmonic generation (FHG). Pulse energies and durations were in ranges of 0.3-1.8 mJ and 1.5-7ns, respectively, dependent on the unbleached transmission of the Cr:YAG saturable absorber. We achieved an optical efficiency of greater than 15% for the Yb:YAG laser. Extra-cavity 515 nm second harmonic generation (SHG) was achieved using a 5mm long KTP crystal. The 515 nm light was then frequency doubled by focusing it into a 7mm long BBO crystal, resulting in a 15% conversion efficiency from 1030nm to 257.5 nm, with an average UV power greater than 100 mW.

Citation Download Citation

Brian Cole, Chris McIntosh, Alan Hays, Tom Dilazaro, and Lew Goldberg "UV by the fourth harmonic generation of compact side-pumped Yb:YAG laser emission", Proc. SPIE 9726, Solid State Lasers XXV: Technology and Devices, 972623 (16 March 2016); https://doi.org/10.1117/12.2213452

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