Work

Intensity noise suppression in pulsed lasers via combining relaxation oscillation with nonlinear frequency conversion

Year: 2026

Type: article

Abstract: This paper reports a method for reducing the relative intensity noise (RIN) of actively Q-switched pulsed laser by combining the relaxation oscillation (RO) and nonlinear optical frequency conversion (NOFC). When a RO is introduced by slightly lowering the diffraction loss of acousto-optic (AO) Q-switch, the initial population inversion per pulse is stabilized to a constant value by the RO process. The RIN between pulses decreases from 4.90% to 2.48% by optimizing the diffraction loss of AO Q-switch and the RO duration. On this basis, the NOFC is introduced into the cavity by a noncritical phase-matched nonlinear crystal LiB 3 O 5 (LBO) to further suppress the intensity fluctuation arising from different longitudinal-mode beating with random phases, and the RIN further decreases to 1.30%, corresponding to a pulse energy stability of 0.09%. This is the lowest RIN between pulses in large energy Q-switched lasers, to the best of our knowledge. The proposed method paves the way to effectively suppress the RIN of pulsed lasers, which will help us to explore what we believe to be many new physical phenomena due to their high peak power and available manipulation in time dimension.

Source: Optics Express

DOI: 10.1364/oe.586251

Authors: Jie Yang, Yanlin Zhang, Weijie Li, Xiaojun Jia, Huadong Lu, Kunchi Peng

Institution: Shanxi University

Language: English

Topic: Solid State Laser Technologies

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funder: National Natural Science Foundation of China