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Multipass configuration to achieve high-frequency conversion in Li2B4O7 crystals.

Udit Chatterjee1, Sudipta Gangopadhyay, Chittaranjan Ghosh

  • 1Laser Laboratory, Department of Physics, Burdwan University, Burdwan-713104, India. duitudit@yahoo.com

Applied Optics
|March 9, 2005
PubMed
Summary

Researchers achieved 21% conversion efficiency for Nd:YAG laser second-harmonic generation using twin lithium tetraborate crystals. This multipass configuration offers a versatile method for nonlinear frequency conversion, even with crystals with challenging properties.

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Area of Science:

  • Nonlinear optics
  • Laser physics
  • Materials science

Background:

  • Second-harmonic generation (SHG) is crucial for laser frequency conversion.
  • Lithium tetraborate (LBO) crystals offer unique nonlinear properties but have historically faced challenges in SHG efficiency.
  • Nd:YAG lasers are widely used in scientific and industrial applications.

Purpose of the Study:

  • To demonstrate a multipass configuration for efficient SHG of Nd:YAG laser radiation.
  • To evaluate the performance of twin lithium tetraborate crystals in this configuration.
  • To explore the suitability of the setup for various nonlinear crystals.

Main Methods:

  • Utilized a multipass optical setup for second-harmonic generation.
  • Employed twin lithium tetraborate crystals for frequency doubling.

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  • Investigated the conversion efficiency of the Nd:YAG laser radiation.

    • Main Results:

    • Achieved a conversion efficiency of 21% in twin lithium tetraborate crystals.
    • Demonstrated high efficiency despite the crystal's low effective nonlinear coefficient (1/6th of KDP).
    • The multipass configuration proved effective for crystals with large walk-off angles or low nonlinear coefficients.

    Conclusions:

    • The demonstrated multipass configuration enables efficient SHG in lithium tetraborate crystals.
    • This method is adaptable for various nonlinear crystals, including those with large effective nonlinear coefficients but low laser damage thresholds.
    • The findings present a valuable advancement for nonlinear frequency conversion technologies.