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Proceedings Paper

High efficiency fourth-harmonic generation from nanosecond fiber master oscillator power amplifier
Author(s): Xiaodong Mu; Paul Steinvurzel; Todd S. Rose; William T. Lotshaw; Steven M. Beck; James H. Clemmons
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Paper Abstract

We demonstrate high power, deep ultraviolet (DUV) conversion to 266 nm through frequency quadrupling of a nanosecond pulse width 1064 nm fiber master oscillator power amplifier (MOPA). The MOPA system uses an Yb-doped double-clad polarization-maintaining large mode area tapered fiber as the final gain stage to generate 0.5-mJ, 10 W, 1.7- ns single mode pulses at a repetition rate of 20 kHz with measured spectral bandwidth of 10.6 GHz (40 pm), and beam qualities of Mx 2=1.07 and My 2=1.03, respectively. Using LBO and BBO crystals for the second-harmonic generation (SHG) and fourth-harmonic generation (FHG), we have achieved 375 μJ (7.5 W) and 92.5 μJ (1.85 W) at wavelengths of 532 nm and 266 nm, respectively. To the best of our knowledge these are the highest narrowband infrared, green and UV pulse energies obtained to date from a fully spliced fiber amplifier. We also demonstrate high efficiency SHG and FHG with walk-off compensated (WOC) crystal pairs and tightly focused pump beam. An SHG efficiency of 75%, FHG efficiency of 47%, and an overall efficiency of 35% from 1064 nm to 266 nm are obtained.

Paper Details

Date Published: 4 March 2016
PDF: 7 pages
Proc. SPIE 9731, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XV, 973108 (4 March 2016); doi: 10.1117/12.2208946
Show Author Affiliations
Xiaodong Mu, The Aerospace Corp. (United States)
Paul Steinvurzel, The Aerospace Corp. (United States)
Todd S. Rose, The Aerospace Corp. (United States)
William T. Lotshaw, The Aerospace Corp. (United States)
Steven M. Beck, The Aerospace Corp. (United States)
James H. Clemmons, The Aerospace Corp. (United States)

Published in SPIE Proceedings Vol. 9731:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XV
Konstantin L. Vodopyanov; Kenneth L. Schepler, Editor(s)

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