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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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A new method for locking the signal-field phase difference in a type-II optical parametric oscillator above

Matthew Pysher¹, Yoshichika Miwa, Reihaneh Shahrokhshahi

¹Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714, USA.

|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.

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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.