Experimental investigation of single and twin AgGaSe2 crystals for CW 10.2 μm SHG

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Two twin AgGaSe2 crystals (lc=20 mm) cut for the second-harmonic generation (SHG) of 10.2 μm radiation have been submitted to up to 1.3 W single-mode continuous-wave (CW) output of a CO2 laser focused to a decreasing beam radius w0. For a power density exceeding 1.6 kW/cm2, corresponding to a focusing parameter l= lc zR far under the theoretical optimum one, the second-harmonic (SH) generated power starts to saturate due to thermal effects. The study of the conversion efficiency versus the focusing parameter for the walkoff-compensated twin device reveals that this two-crystal device is more efficient than would be a single crystal of length 2lc, despite the small walkoff angle in this material.

Original languageEnglish
Pages (from-to)320-326
Number of pages7
JournalOptics Communications
Issue number3-4
Publication statusPublished - Sep 1 1995
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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