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Single-frequency pulsed laser source with hybrid MOPA configuration.

Ren Zhu1, Juntao Wang, Jun Zhou

  • 1Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Jiading District, Shanghai, China.

Applied Optics
|June 15, 2012
PubMed
Summary

Researchers developed a hybrid amplifier for single-frequency, high-energy laser pulses. This novel system achieves 10 mJ pulse energy with a long pulse width and transform-limited linewidth.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • High-Energy Lasers

Background:

  • Generating high-energy laser pulses with specific spectral characteristics is crucial for various scientific applications.
  • Traditional amplifier configurations often face limitations in achieving both high energy and narrow linewidth simultaneously.

Purpose of the Study:

  • To present a unique hybrid master oscillator power amplifier (MO amplifier) configuration.
  • To achieve single-frequency, high-energy laser pulses at 1064 nm with specific pulse width and linewidth characteristics.

Main Methods:

  • Utilized a single-frequency seed laser as the initial source.
  • Employed a multistage fiber amplifier for initial amplification.
  • Incorporated a four-pass crystal rod amplifier for final power amplification.

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  • Configured a hybrid master oscillator power amplifier (MO amplifier) setup.

    • Main Results:

    • Achieved pulse energy of 10 mJ at a repetition rate of 100 Hz.
    • Obtained a pulse width of approximately 110 ns.
    • Measured a transform-limited linewidth of 3.2 MHz.
    • Characterized the output beam with an M(2) factor of approximately 1.5.

    Conclusions:

    • This study reports the first use of a hybrid amplifier configuration to achieve 10 mJ pulses.
    • The developed system successfully delivers long pulse width and transform-limited linewidth.
    • The results demonstrate a significant advancement in high-energy, single-frequency laser pulse generation.