Reduction of Nonlinear Absorption in Li2B4O7 by Temperature- and Repetition Rate-Control

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Published 20 November 2009 • Copyright (c) 2009 The Japan Society of Applied Physics
, , Citation Masakuni Takahashi et al 2009 Jpn. J. Appl. Phys. 48 112502 DOI 10.1143/JJAP.48.112502

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Author affiliations

1 Central Research Institute, Mitsubishi Materials Corporation, 1002-14 Mukohyama, Naka, Ibaraki 311-0102, Japan

2 Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan

3 The University of Alabama at Birmingham, 310 Campbell Hal, 1300 University Blvd, Birmingham, AL 35216, U.S.A.

4 Q-Peak Inc., 135 South Road, Bedford, MA 01730, U.S.A.

Dates

  1. Received 30 March 2009
  2. Accepted 4 September 2009
  3. Published

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Abstract

We address the critical issue of thermal dephasing of the UV harmonic generation process due to nonlinear absorption in Li2B4O7 crystals. Reduction of nonlinear absorption is achieved by increasing the crystal temperature up to 200 °C and reducing the pulse repetition rate. Our results show the way for significant improvement of the conversion efficiency for the fourth harmonic generation of Nd lasers using Li2B4O7 crystals.

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10.1143/JJAP.48.112502