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Unidirectional single-mode Nd:YAG laser with a planar semimonolithic ring cavity.

J R Park1, T H Yoon, M S Chung

  • 1Department of Physics, Korea Advanced Institute of Science and Technology, Kusongdong, Yusong-gu, Taejon 305-701, Korea. s_jrpark@cais.kaist.ac.kr

Applied Optics
|March 8, 2008
PubMed
Summary

This study demonstrates unidirectional single-mode operation in a diode-pumped Nd:YAG laser using a novel semimonolithic ring cavity. The optical diode design achieved 155 mW output power and a narrow linewidth for advanced laser applications.

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Area of Science:

  • Lasers and Photonics
  • Solid-State Lasers
  • Optical Engineering

Background:

  • Diode-pumped solid-state lasers (DPSS) are crucial for various applications.
  • Achieving stable, unidirectional single-mode operation is essential for high-precision laser systems.
  • Ring cavities offer advantages for single-mode operation but require effective isolation mechanisms.

Purpose of the Study:

  • To demonstrate unidirectional single-mode operation of a diode-pumped Nd:YAG laser.
  • To develop and characterize a novel planar semimonolithic ring cavity.
  • To investigate the performance of an integrated optical diode within the laser cavity.

Main Methods:

  • Utilized a diode-pumped Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) laser.
  • Constructed a planar semimonolithic ring cavity incorporating a Faraday rotator, polarization rotator, and partial polarizer.

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  • Employed a 1.2-W diode laser at 809 nm for pumping the Nd:YAG gain medium.
  • Measured output power, slope efficiency, and laser linewidth using spectral analysis.

    • Main Results:

    • Achieved stable unidirectional single-mode operation at 1064 nm.
    • Obtained a maximum single-mode output power of 155 mW with a slope efficiency of 17%.
    • Inferred a laser linewidth below 100 kHz and demonstrated continuous tuning capability exceeding 2 GHz.

    Conclusions:

    • The planar semimonolithic ring cavity effectively functions as an optical diode, enabling unidirectional single-mode laser operation.
    • The demonstrated Nd:YAG laser system offers high performance metrics suitable for applications requiring narrow linewidth and tunability.
    • This integrated approach provides a compact and efficient solution for advanced laser sources.