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Direct electro-optic phase control for carrier-envelope offset frequency stabilization in solid-state lasers.

Karolina Suliga, Jarosław Sotor, Maciej Kowalczyk

|June 14, 2025

Summary

This study introduces a new method for stabilizing laser carrier-envelope offset frequency (fceo) using electro-optic modulators. This approach offers improved performance over traditional pump power control for mode-locked lasers.

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Area of Science:

Laser Physics
Nonlinear Optics
Quantum Optics

Background:

Carrier-envelope offset frequency (fceo) stabilization is crucial for mode-locked lasers.
Current methods using pump power control have limited bandwidth due to gain medium response times.

Purpose of the Study:

To present and validate a novel fceo stabilization technique for solid-state lasers.
To leverage the linear electro-optic effect for direct control of carrier-envelope phase evolution.

Main Methods:

Implementation of a lithium niobate electro-optic modulator (EOM) in a Kerr-lens mode-locked Cr:ZnS laser.
Direct control of carrier-envelope phase using the electro-optic effect, bypassing gain medium limitations.

Main Results:

EOM-based fceo stabilization achieved superior performance with 6.6 mrad phase noise (10 Hz - 12.5 MHz), outperforming pump-modulation (7.6 mrad).
Identified a bandwidth limitation due to piezoelectric-induced acoustic resonance in the lithium niobate EOM.

Conclusions:

Electro-optic modulation offers a promising, high-bandwidth alternative for fceo stabilization in solid-state lasers.
EOM design must consider piezoelectric effects to optimize actuator response and further enhance fceo stability.