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Energy-scalable pulsed mid-IR source using orientation-patterned GaAs.

Douglas French1, Rita Peterson, Igor Jovanovic

  • 1Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA. dfrench@psu.edu

Optics Letters
|February 18, 2011
PubMed
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Researchers enhanced mid-infrared (mid-IR) laser power using orientation-patterned gallium arsenide (OPGaAs) with a master oscillator power amplifier design. This approach overcomes limitations of optical parametric oscillators, enabling higher pulse energy for advanced applications.

Area of Science:

  • Photonics and Laser Technology
  • Materials Science
  • Nonlinear Optics

Background:

  • Coherent mid-infrared (mid-IR) sources are crucial for scientific, medical, and military applications.
  • Orientation-patterned gallium arsenide (OPGaAs) is a key material for mid-IR generation.
  • Optical parametric oscillation (OPO) in OPGaAs has limitations in pulse energy and peak power.

Purpose of the Study:

  • To demonstrate a master oscillator power amplifier (MOPA) concept using OPGaAs.
  • To overcome the energy limitations of OPGaAs-based OPOs.
  • To scale mid-IR sources to higher pulse energies.

Main Methods:

  • Implemented a MOPA configuration with an OPGaAs optical parametric amplifier (OPA).
  • Amplified 3.85μm mid-IR pulses generated by an OPO.

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  • Utilized a Th,Ho:YLF Q-switched laser as the pump source for the OPA.

    • Main Results:

    • Achieved a fivefold increase in pulse energy compared to the OPO alone.
    • Successfully demonstrated high-energy mid-IR beam generation via OPGaAs OPA.
    • Validated the MOPA concept for scaling OPGaAs-based mid-IR sources.

    Conclusions:

    • The MOPA approach effectively scales the output energy of OPGaAs-based mid-IR sources.
    • This method overcomes previous limitations in pulse energy and peak power.
    • The demonstrated high-energy mid-IR source has significant potential for various applications.