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Angle-tuned type II external-cavity frequency doubling without temperature stabilization.

Y Emery1, A Fleischhauer, T Walther

  • 1Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA.

Applied Optics
|February 29, 2008
PubMed
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We achieved efficient frequency doubling of a diode laser using a novel ring cavity setup. This method eliminates the need for crystal temperature stabilization, simplifying the process for nonlinear optical applications.

Area of Science:

  • Nonlinear Optics
  • Laser Physics
  • Materials Science

Background:

  • Frequency doubling is crucial for generating shorter wavelengths from existing lasers.
  • Traditional methods often require precise temperature control for nonlinear crystals, adding complexity.
  • Potassium Titanyl Phosphate (KTP) crystals are widely used for frequency conversion.

Purpose of the Study:

  • To demonstrate a simplified method for frequency doubling a 1064 nm diode laser.
  • To eliminate the requirement for temperature stabilization of the nonlinear crystal.
  • To achieve stable operation of an external ring cavity for efficient nonlinear processes.

Main Methods:

  • Utilized an external ring cavity containing an angle-tuned Potassium Titanyl Phosphate (KTP) type II crystal.

Related Experiment Videos

  • Implemented an intracavity half-wave (λ/2) plate to rotate the fundamental laser's polarization by 90 degrees per round trip.
  • Employed a standard electronic locking circuit to maintain cavity resonance.

    • Main Results:

    • Successfully achieved frequency doubling of a low-power continuous-wave (cw) diode laser at 1064 nm.
    • Demonstrated a setup that does not require temperature stabilization of the KTP crystal.
    • Confirmed stable resonance condition maintenance through the polarization rotation technique.

    Conclusions:

    • The developed method offers a simplified and robust approach to frequency doubling using KTP crystals.
    • Eliminating temperature stabilization significantly reduces system complexity and cost.
    • This technique is promising for practical applications requiring efficient second-harmonic generation.