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Equivalent temperature stabilization of nonlinear-optical crystals.

K V Zotov, N V Tereschenko, A Yu Ostapiv

|February 15, 2024

Summary

We present a novel method for stabilizing nonlinear-optic crystal temperature using piezoelectric resonance (PR) frequency. This technique enhances second harmonic (SH) generation stability and power in periodically poled lithium niobate (PPLN) lasers.

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Area of Science:

Laser Physics
Materials Science
Optical Engineering

Background:

Nonlinear-optic crystals are crucial for laser frequency conversion.
Temperature fluctuations significantly impact crystal performance and stability.
External temperature sensors often lack precision and introduce complexity.

Purpose of the Study:

To develop a self-sensing temperature stabilization method for nonlinear-optic crystals.
To improve the stability and efficiency of laser frequency conversion processes.
To demonstrate the effectiveness of piezoelectric resonance (PR) frequency stabilization.

Main Methods:

Utilizing the piezoelectric resonance (PR) frequency of the crystal as an intrinsic temperature sensor.
Employing an electronic oscillator to conveniently determine the PR frequency.
Implementing PR frequency stabilization for laser system control.

Main Results:

Achieved stable generation of the second harmonic (SH) at 532 nm in periodically poled lithium niobate (PPLN).
Demonstrated over 30% power enhancement in SH generation compared to external sensor methods.
Significantly improved the long-term stability of SH power output.

Conclusions:

PR frequency stabilization offers a highly effective and convenient approach for nonlinear-optic crystal temperature control.
This self-sensing method surpasses traditional external sensing in stability and efficiency.
The technique holds promise for advancing high-power and stable laser systems.