基于反射式体布拉格光栅的450 nm窄带宽半导体激光器实验研究  

Experimental Study of 450 nm Narrow-bandwidth Semiconductor Laser Based on Reflective Volume Bragg Grating

作　　者：曹波涛 闫运浩 柴聪鹏 郭凌伟[2] 华有杰 徐时清 赵士龙 CAO Botao;YAN Yunhao;CHAI Congpeng;GUO Lingwei;HUA Youjie;XU Shiqing;ZHAO Shilong(College of Optics and Electronics,China Jiliang University,Hangzhou 310018,China;School of Electronic Information,Hangzhou Dianzi University,Hangzhou 310018,China)

机构地区：[1]中国计量大学光学与电子科技学院,杭州310018 [2]杭州电子科技大学电子信息学院,杭州310018

出　　处：《光子学报》2025年第1期10-17,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(No.12174360);浙江省自然科学基金重点项目(No.LZ21F050001)。

摘　　要：体布拉格光栅作为激光外腔镜可以有效降低激光器运行过程中热效应引起的温度漂移和谱线加宽问题。利用中心波长为449.7 nm的体布拉格光栅作为蓝光半导体激光器的外腔反射镜对激光器进行外腔锁模,研究激光器的输出光特性。实验确定了具备稳定激光输出的蓝光二极管-快轴准直镜-慢轴准直镜的激光器结构。在不同电流和水冷温度条件下,分析了电流漂移和温度漂移现象,并检测了体布拉格光栅对激光波长锁定的效果。在22℃水冷和1 A电流条件下,体布拉格光栅将激光器的中心波长稳定在449.7 nm,谱线半高全宽压缩至0.1 nm,实现了具有波长稳定性的窄带宽激光输出。该研究可为开发高亮度、高功率、高色纯度的蓝光半导体激光器提供参考。To explore the suppression effect of volume Bragg grating on the temperature drift and spectral line broadening caused by thermal effects during laser operation,a volume Bragg grating with a central wavelength of 449.7 nm was used as the external cavity reflector for blue semiconductor lasers.Under the external cavity mode-locking condition,the influence of different environmental variables on the laser output characteristics was studied.In the experiment,an optical system was built by using a blue light diode,a fast-axis collimating lens and a slow-axis collimating lens to achieve stable laser output.The control variable method was adopted to study the influence of a single variable.The water-cooling temperature,the excitation current and the distance between the slow-axis collimator and the volume Bragg grating were changed step by step,and the spectra in the free-running state and those under the external cavity mode-locking were compared and analyzed.Firstly,the wave-locking position of the volume grating was determined,and an adsorption device was used to modulate the position of the volume grating up and down to compare the free-running spectrum and the wave-locked spectrum under external cavity modulation.The experimental results showed that under the condition of constant water cooling at 22℃,when a 3 A current was applied to the blue semiconductor chip,the central wavelength of the freerunning laser output spectrum was at 447.4 nm,and the central wavelength of the laser output spectrum locked by the volume Bragg grating was at 449.7 nm,and the spectral line width was narrowed from 1.4 nm to 0.3 nm.When the current increased from 1 A to 3 A,significant wavelength drift and spectral line broadening caused by thermal effects were observed in the free-running spectrum.Moreover,as the current increased,the thermal effect of the semiconductor chip became more significant,and the central wavelength shifted towards the long wavelength at an accelerated speed.However,by adding the volume Bragg grating as the ex

关 键 词：激光器 窄带宽 蓝光 外腔锁模 温度漂移 波长稳定性 

分 类 号：TN248.4[电子电信—物理电子学]