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Related Experiment Videos

Optical parametric oscillation in quasi-phase-matched GaAs.

K L Vodopyanov1, O Levi, P S Kuo

  • 1E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. vodopyan@stanford.edu

Optics Letters
|September 11, 2004
PubMed
Summary

We developed a gallium arsenide (GaAs) optical parametric oscillator (OPO) for tunable mid-infrared light generation. This GaAs OPO achieved efficient broadband tuning and demonstrated pump-polarization-independent frequency conversion.

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Area of Science:

  • Nonlinear Optics
  • Semiconductor Lasers
  • Mid-Infrared Technology

Background:

  • Gallium arsenide (GaAs) is a promising material for nonlinear optical devices due to its high nonlinear coefficients.
  • Optical parametric oscillators (OPOs) are versatile sources for generating tunable laser light.
  • Efficient and broadly tunable mid-infrared sources are crucial for various spectroscopic and sensing applications.

Purpose of the Study:

  • To demonstrate a novel optical parametric oscillator (OPO) utilizing an epitaxially grown orientation-patterned gallium arsenide (GaAs) crystal.
  • To investigate the tuning characteristics and efficiency of the GaAs-based OPO in the mid-infrared region.
  • To explore the feasibility of pump-polarization-independent frequency conversion in GaAs.

Main Methods:

Related Experiment Videos

  • Fabrication of an all-epitaxially-grown orientation-patterned GaAs crystal (0.5 mm x 5 mm x 11 mm) with a domain reversal period of 61.2 microm.
  • Utilizing the GaAs crystal in a singly resonant optical parametric oscillator (SRO) configuration.
  • Tuning the output wavelength by adjusting the near-infrared pump laser wavelength (1.8-2 microm) or the crystal temperature.

    • Main Results:

    • Broadly tunable mid-infrared output achieved between 2.28 and 9.14 microm, limited by OPO mirror reflectivity.
    • Low pump threshold of 16 microJ for 6-ns pump pulses.
    • High photon conversion slope efficiency reaching 54%.
    • Experimental demonstration of pump-polarization-independent frequency conversion in GaAs.

    Conclusions:

    • The demonstrated GaAs-based OPO is an efficient and broadly tunable source for mid-infrared generation.
    • The material properties of GaAs enable high-performance nonlinear optical frequency conversion.
    • The pump-polarization-independent operation offers practical advantages for real-world applications.