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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
A new method for locking the signal-field phase difference in a type-II optical parametric oscillator above threshold
Matthew Pysher1, Yoshichika Miwa, Reihaneh Shahrokhshahi
1Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714, USA.
Optics Express
|January 4, 2011
Summary
We developed a new optical parametric oscillator (OPO) phaselocking method using pump beam modulation. This technique successfully stabilizes OPO signal frequencies, avoiding crystal damage from previous methods.
Area of Science:
- Nonlinear Optics
- Quantum Optics
- Laser Physics
Background:
- Phaselocking optical parametric oscillators (OPOs) is crucial for coherent light generation.
- Previous phaselocking techniques using direct electronic correction led to crystal damage.
Purpose of the Study:
- To propose and demonstrate a novel, non-damaging method for phaselocking signal fields in a type-II optical parametric oscillator (OPO).
- To stabilize the frequency difference of OPO signals using pump beam modulation.
Main Methods:
- Amplitude modulation of the pump beam in a nondegenerate, type-II OPO.
- Utilizing the temperature-tuning of the nonlinear crystal's refractive index to influence signal frequency difference.
- Employing pump modulation as a correction mechanism for phase-difference locking.
Main Results:
- Successfully achieved phase-difference locking of OPO signals.
- Observed a stable 1 kHz beat note lasting over 10 seconds.
- Demonstrated a method that avoids direct electronic phase-correction to the nonlinear crystal.
Conclusions:
- The proposed pump modulation method offers an effective and non-destructive approach for phaselocking OPO signals.
- This technique enhances the stability and reliability of OPO operation for various applications.
