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High-efficiency, multicrystal, single-pass, continuous-wave second harmonic generation.

S Chaitanya Kumar1, G K Samanta, Kavita Devi

  • 1ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, Barcelona, Spain. chaitanya.suddapalli@icfo.es

Optics Express
|July 1, 2011
PubMed
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This study presents an efficient multicrystal scheme for continuous-wave (cw) second harmonic generation (SHG), achieving over 55% conversion efficiency and multiwatt output power at 532 nm. The novel cascaded approach ensures stable, high-quality green laser output for various applications.

Area of Science:

  • Nonlinear Optics
  • Laser Physics
  • Materials Science

Background:

  • Second Harmonic Generation (SHG) is crucial for frequency conversion in lasers.
  • Efficient and stable SHG is essential for applications requiring green light sources.
  • Existing methods face limitations in efficiency, power, and stability.

Purpose of the Study:

  • To develop and characterize an efficient, continuous-wave (cw) single-pass second harmonic generation (SHG) system.
  • To investigate a novel cascaded multicrystal scheme for enhanced SHG performance.
  • To optimize critical design parameters for maximizing SHG efficiency and output power.

Main Methods:

  • Experimental and theoretical studies of single-crystal, double-crystal, and multicrystal SHG schemes.

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  • Optimization of focusing and phase-matching temperature in each stage.
  • Quasi-continuous-wave (cw) measurements to study thermal effects on efficiency.
  • Theoretical calculations for dispersion effects in air.

    • Main Results:

    • >55% conversion efficiency and multiwatt output powers at 532 nm achieved.
    • Demonstrated stable SH power with <6.5% peak-to-peak fluctuation over 2 hours.
    • High spatial beam quality (M²<1.6) maintained.
    • Comparison of single, double, and multicrystal schemes highlights the cascaded approach's superiority.

    Conclusions:

    • The novel cascaded multicrystal scheme offers a significant advancement in cw SHG.
    • Optimized design parameters lead to high efficiency and stable multiwatt green laser output.
    • This technique provides a robust solution for generating high-quality 532 nm laser light.