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Pump-enhanced difference-frequency generation at 3.3 microm.

Mark F Witinski1, Joshua B Paul, James G Anderson

  • 1Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA. mwitinski@huarp.harvard.edu

Applied Optics
|May 5, 2009
PubMed
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This study demonstrates enhanced mid-infrared light generation using a novel cavity design. The technique significantly boosts idler power, enabling sensitive spectroscopy applications.

Area of Science:

  • Laser Physics
  • Nonlinear Optics
  • Spectroscopy

Background:

  • Continuous wave difference-frequency generation (DFG) is crucial for mid-infrared (mid-IR) light sources.
  • Efficient generation of tunable mid-IR radiation is essential for various spectroscopic applications.

Purpose of the Study:

  • To demonstrate continuous wave intracavity difference-frequency generation in the mid-infrared.
  • To enhance idler power using a pump laser enhancement cavity.
  • To provide a tunable mid-IR source for direct absorption spectroscopy.

Main Methods:

  • Constructed a cavity around a periodically poled lithium niobate crystal for pump laser enhancement.
  • Utilized the Pound-Drever-Hall technique to lock cavity length to the pump laser frequency.

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  • Generated a tunable single-mode 3.3 micrometer idler beam.

    • Main Results:

    • Achieved a gain factor of 12 in idler power compared to a single-pass configuration.
    • Produced a widely tunable single-mode idler beam with nearly 10 mW of power.
    • Demonstrated the feasibility of the pump-enhancement method for mid-IR generation.

    Conclusions:

    • Intracavity enhancement significantly boosts mid-IR DFG efficiency.
    • The developed system provides a powerful tool for direct absorption spectroscopy.
    • The demonstrated method is scalable to hundreds of milliwatts of mid-IR output power.