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Multicrystal, continuous-wave, single-pass second-harmonic generation with 56% efficiency.

G K Samanta1, S Chaitanya Kumar, Kavita Devi

  • 1ICFO–Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain. goutam.samanta@icfo.es

Optics Letters
|October 23, 2010
PubMed
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This study introduces a multicrystal (MC) scheme for efficient single-pass second-harmonic-generation (SP-SHG) of continuous-wave (cw) laser light. This method achieves high conversion efficiencies up to 56% for green laser output.

Area of Science:

  • Nonlinear Optics
  • Laser Physics
  • Materials Science

Background:

  • Continuous-wave (cw) laser radiation requires efficient methods for frequency conversion.
  • Second-harmonic-generation (SHG) is a key nonlinear optical process for generating shorter wavelengths.
  • Existing single-crystal schemes for SHG face limitations in conversion efficiency.

Purpose of the Study:

  • To develop a simple and compact implementation for single-pass second-harmonic-generation (SP-SHG).
  • To achieve the highest possible conversion efficiency for cw laser radiation using a cascaded multicrystal (MC) scheme.
  • To evaluate the performance of the MC scheme in terms of efficiency, power stability, and beam quality.

Main Methods:

  • Utilized a cascaded multicrystal (MC) scheme with multiple identical MgO:sPPLT crystals.

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  • Employed a 30W cw Yb-fiber laser operating at 1064nm as the fundamental light source.
  • Investigated the SP-SHG process in the low-power and high-power regimes.

    • Main Results:

    • Demonstrated SP-SHG into the green with a maximum conversion efficiency of 56%.
    • Achieved 5.6W of green output for 10W of input pump power, and 13W for 25.1W input.
    • The MC scheme provided high conversion efficiency across different power levels.

    Conclusions:

    • The cascaded multicrystal (MC) scheme offers a significant improvement in cw SP-SHG efficiency compared to single-crystal methods.
    • This approach maintains excellent power stability and beam quality.
    • The developed implementation is simple, compact, and highly efficient for generating green laser light.