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

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Periodic mode hopping induced by thermo-optic effects in continuous-wave optical parametric oscillators.

P Suret, M Lefranc, D Derozier

|December 1, 2007

Summary

Thermal effects cause periodic mode hopping in continuous-wave optical parametric oscillators (OPOs). This instability, observed in experiments, is explained by a thermo-optic model and is expected in various high-power setups.

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Area of Science:

Nonlinear optics
Laser physics
Quantum optics

Background:

Continuous-wave optical parametric oscillators (OPOs) are crucial light sources in various scientific fields.
Understanding mode dynamics and instabilities is essential for optimizing OPO performance and stability.
Previous studies have explored various mechanisms for mode hopping, but thermal effects in specific OPO configurations require further investigation.

Purpose of the Study:

To investigate the role of thermal effects in inducing periodic mode hopping in continuous-wave optical parametric oscillators (OPOs).
To identify the conditions under which thermal effects lead to mode hopping instability in triply and doubly resonant OPOs.
To experimentally validate the theoretical predictions using a type II OPO and compare with a thermo-optic model.

Main Methods:

Theoretical analysis of mode stability in resonant optical cavities considering thermal effects.
Experimental implementation of a type II OPO in both triply and doubly resonant configurations.
Development and application of a simple thermo-optic multimode model to simulate OPO behavior.

Main Results:

Demonstrated that thermal effects can lead to periodic mode hopping in cw OPOs.
Identified that mode hopping occurs when two modes have different intensities at their stability exchange point, a condition met in resonant OPOs.
Experimentally observed these oscillations in a type II OPO and confirmed the model's ability to reproduce experimental regimes.

Conclusions:

Thermal effects represent a significant mechanism for inducing periodic mode hopping in cw OPOs.
The thermo-optic multimode model accurately describes the observed experimental regimes.
This mechanism is expected to be relevant for various multimode instabilities in high-power optical parametric oscillator systems.