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Improved SHG phase matching response for focused Gaussian beams in Gouy compensated quasi-phase-matched structures

By Huw E. Major, James C. Gates, Corin B.E. Gawith and Peter G.R. Smith


Nonlinear interactions such as second harmonic generation (SHG) [1] and sum and difference frequency generation are routinely used for the generation of laser wavelengths. With high power lasers it is necessary to use bulk crystals and tight beam focusing to achieve the maximum conversion efficiency. The use of Quasiphase-matched (QPM) materials such as PPLN and PPKTP are now routinely reported; however, as we will show in this paper, a simple linear QPM crystal does not fully optimize the conversion response. We will report theoretical and experimental results showing that by careful control of the crystal design it is possible to fully compensate for the phase errors associated with the focusing induced Gouy shif

Topics: QC, TK
Year: 2009
OAI identifier: oai:eprints.soton.ac.uk:78967
Provided by: e-Prints Soton

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  1. (1968). Parametric interaction of focused Gaussian light beams”, doi
  2. (2004). Room-temperature, continuous wave 1W green power by single-pass frequency doubling in a bulk periodically poled MgO:LiNbO3 crystal”, doi

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