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Related Experiment Videos

Efficient frequency doubling by a phase-compensated crystal in a semimonolithic cavity.

Irit Juwiler1, Ady Arie

  • 1Department of Electrical Engineering-Physical Electronics, Tel Aviv University, Tel Aviv 69978, Israel. iritha@post.tau.ac.il

Applied Optics
|January 14, 2004
PubMed
Summary

This study demonstrates effective phase compensation in a frequency-doubling cavity using a KTP crystal, overcoming thermal lensing to achieve high conversion efficiency for nonlinear frequency conversion.

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Area of Science:

  • Nonlinear optics
  • Laser physics
  • Materials science

Background:

  • Nonlinear frequency conversion is crucial for generating new optical frequencies.
  • Phase accumulation in multi-pass systems necessitates compensation for efficient conversion.
  • Thermal lensing in nonlinear crystals can degrade performance at high pump powers.

Purpose of the Study:

  • To experimentally demonstrate phase compensation in a compact semimonolithic frequency-doubling cavity.
  • To investigate and mitigate the effects of power-dependent thermal lensing in a periodically poled KTP crystal.
  • To present a design procedure for compensating thermal lensing in such systems.

Main Methods:

  • Utilized a periodically poled potassium titanyl phosphate (KTP) crystal within a semimonolithic cavity.

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  • Performed experimental measurements of conversion efficiency under varying cw Nd:YAG pump powers.
  • Conducted theoretical calculations considering mode mismatch due to thermal loading.

    • Main Results:

    • Achieved a highest conversion efficiency of 56.5% for second-harmonic generation.
    • Generated 117.5 mW of second-harmonic power at 532 nm from 208 mW of pump power.
    • Observed and theoretically supported the decrease in conversion efficiency at high pump powers due to thermal lensing.

    Conclusions:

    • Phase compensation is vital for efficient nonlinear frequency conversion in systems with dispersive elements.
    • A practical design procedure can compensate for thermal lensing effects, enabling high performance.
    • The demonstrated technique offers a pathway to improved efficiency in compact frequency conversion devices.