Narrow linewidth UV sources at 257nm

Brian Cole; Lew Goldberg; Chris McIntosh; Vernon King; Alan Hays

doi:10.1117/12.2253910

17 February 2017 Narrow linewidth UV sources at 257nm

Brian Cole, Lew Goldberg, Chris McIntosh, Vernon King, Alan Hays

Proceedings Volume 10082, Solid State Lasers XXVI: Technology and Devices; 100821O (2017) https://doi.org/10.1117/12.2253910
Event: SPIE LASE, 2017, San Francisco, California, United States

Abstract

We describe and compare the performance of two types of compact, passively Q-switched Yb:YAG 1030nm lasers and their use for 257nm fourth harmonic generation (FHG). In the first implementation, an end-pumped Yb:YAG laser produced a 250μJ pulse train with an average power at 1030nm of 3.6W. Using a 10mm LBO crystal (70% doubling efficiency), followed by a 7mm BBO crystal (45% conversion efficiency), 1.1W at 257nm was generated (overall FHG efficiency of 30%). The second implementation was a side-pumped Q-switched Yb:YAG laser pumped by a 200W diode bar. A 10mm KTP crystal followed by a 6mm BBO crystal resulted a 15% FHG conversion efficiency. The UV emission was in a form of 1-5 Hz PRF, 2ms long burst of 0.2mJ pulses with a 30kHz intra-burst PRF. Within a 1.65ms emission window, an 11.5mJ burst at 257 nm was generated that had a maximum intra-burst power of 7W. This paper will address the merits of each approach for realizing a man-portable laser suitable for ultraviolet Raman explosives detection.

Citation Download Citation

Brian Cole, Lew Goldberg, Chris McIntosh, Vernon King, and Alan Hays "Narrow linewidth UV sources at 257nm", Proc. SPIE 10082, Solid State Lasers XXVI: Technology and Devices, 100821O (17 February 2017); https://doi.org/10.1117/12.2253910

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