Open AccessNarrow-band 1 W source at 257 nm using frequency quadrupled passively Q-switched Yb:YAG laser
Author(s) -
L. Goldberg,
Brian J. Cole,
Chris McIntosh,
Ver King,
A. D. Hays,
S. R. Chinn
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.017397
Subject(s) - materials science , lithium triborate , optics , energy conversion efficiency , laser , laser linewidth , barium borate , second harmonic generation , optoelectronics , high harmonic generation , raman spectroscopy , crystal (programming language) , physics , computer science , programming language
We describe generation of 1.1 W of 257 nm emission by frequency quadrupling the 1030 nm emission from a compact passively Q-switched Yb:YAG laser. The laser utilized a volume Bragg grating to achieve a 0.1 nm linewidth required for UV-Raman spectroscopic applications, generated 100 kW peak power, 250 μJ pulses and 3.6 W of average power at 1030 nm. Fourth harmonic generation (FHG) was carried out using a 10 mm lithium triborate (LBO) crystal to generate 515 nm second harmonic with 70% conversion efficiency, followed by a 7 mm beta-barium borate (BBO) crystal to generate 257 nm fourth harmonic with 45% efficiency, resulting in an overall nonlinear conversion efficiency of 31%. Far-field and near-field of the FHG emission were characterized.