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Intensity noise suppression in pulsed lasers via combining relaxation oscillation with nonlinear frequency conversion
Optics Express
|March 18, 2026
Summary
This study reduces pulsed laser noise by combining relaxation oscillation (RO) and nonlinear optical frequency conversion (NOFC). This method significantly lowers relative intensity noise (RIN), enhancing laser stability for new physics research.
Area of Science:
- Laser Physics
- Nonlinear Optics
- Quantum Optics
Background:
- High relative intensity noise (RIN) in pulsed lasers limits applications.
- Actively Q-switched lasers often suffer from intensity fluctuations.
Purpose of the Study:
- To develop a novel method for reducing RIN in actively Q-switched pulsed lasers.
- To enhance pulse energy stability for advanced laser applications.
Main Methods:
- Combining relaxation oscillation (RO) with nonlinear optical frequency conversion (NOFC).
- Optimizing acousto-optic (AO) Q-switch diffraction loss and RO duration.
- Utilizing a noncritical phase-matched LiB3O5 (LBO) nonlinear crystal.
Main Results:
- Reduced RIN from 4.90% to 2.48% by optimizing RO.
- Further decreased RIN to 1.30% using NOFC.
- Achieved pulse energy stability of 0.09%.
Conclusions:
- The combined RO and NOFC method effectively suppresses RIN in pulsed lasers.
- This technique offers the lowest reported RIN for large-energy Q-switched lasers.
- Enables exploration of new physical phenomena requiring high peak power and temporal control.
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