Applied Physics B

, Volume 73, Issue 3, pp 209–214

Intensity and frequency noise characteristics of two coherently-added injection-locked Nd:YAG lasers

  • M. Musha
  • T. Kanaya
  • K. Nakagawa
  • K.-I. Ueda
Article

DOI: 10.1007/s003400100642

Cite this article as:
Musha, M., Kanaya, T., Nakagawa, K. et al. Appl Phys B (2001) 73: 209. doi:10.1007/s003400100642

Abstract

Coherent addition of two injection-locked Nd:YAG lasers has been performed. A maximum output power of 4.4 W and addition efficiency of 0.94 was achieved, which is the highest power-coupling efficiency ever reported. It was shown experimentally that the frequency and intensity noise level of the coherently-added laser are the same as those of a single injection-locked laser. In particular, no additional intensity noise was observed above the relaxation oscillation frequency of the slave laser, which is suitable for use as the light source for a future gravitational wave detector. The frequency noise of the coherently-added laser was suppressed to \({{1 \times 10^{ - 4} } \mathord{\left/ {\vphantom {{1 \times 10^{ - 4} } {\sqrt {Hz} }}} \right. \kern-\nulldelimiterspace} {\sqrt {Hz} }}\) by controlling that of the master laser, and the intensity noise was also suppressed to \({{1 \times 10^{ - 8} } \mathord{\left/ {\vphantom {{1 \times 10^{ - 8} } {\sqrt {Hz} }}} \right. \kern-\nulldelimiterspace} {\sqrt {Hz} }}\) by controlling the intensity of pump lasers used for the slave lasers.

PACS: 04.80.Nn; 42.55.Xi; 42.60.Lh 

Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • M. Musha
    • 1
  • T. Kanaya
    • 1
  • K. Nakagawa
    • 1
  • K.-I. Ueda
    • 1
  1. 1.Institute for Laser Science, University of Electro-Communications, 1-5-1, Chofugaoka, Chofu-shi, Tokyo, 182-8585, JapanJP

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