激光技术2024，Vol.48Issue(4)：572-577,6.DOI:10.7510/jgjs.issn.1001-3806.2024.04.016
压电陶瓷调制激光回馈外腔的实验和分析
Experiment and analysis of piezoelectric transducer modulated laser feedback external cavity
摘要
Abstract
In order to study the influence of the modulation method of the optical feedback effect of the microchip laser on the optical sensitivity of the laser,a method of driving piezoelectric transducer(PZT)with different modulation voltages and frequencies was used to tune the external cavity of the microchip laser,and the changes of the amplitude and sensitivity of the optical feedback fringe were observed.Numerical simulation and analysis based on the composite cavity equivalent model were conducted.The results show that by increasing the PZT modulation frequency so that it is closer to the relaxation oscillation frequency of the laser,the optical amplification effect becomes more obvious,and the output amplitude and PZT modulation frequency have the same trend.The PZT modulation frequency remains unchanged,and the 140 mA pump current is reduced to the light emission threshold current of about 100 mA,the relaxation oscillation peak will gradually approach the PZT frequency shift modulation amount,which can actively amplify the feedback light,and the gain can be as high as 105.The optical sensitivity is related to the distance between the PZT frequency shift amount and the relaxation oscillation peak.The closer the two are,the stronger the optical sensitivity is.The laser feedback system modulated by PZT has the advantages of lower cost and easy adjustment compared with acousto-optic modulation.This study provides a reference for jointly adjusting the pump current and PZT modulation amount to obtain optical feedback stripes with appropriate amplitude and low noise.关键词
激光光学/激光回馈/弛豫振荡/抽运电流/压电陶瓷调制Key words
laser optical/laser feedback/relaxation oscillation/pump current/piezoelectric transducer modulation分类
信息技术与安全科学引用本文复制引用
钟尚殷,邓勇,张书练..压电陶瓷调制激光回馈外腔的实验和分析[J].激光技术,2024,48(4):572-577,6.基金项目
国家自然科学基金资助项目(61775118) （61775118）
