宽范围无跳模外腔可调谐半导体激光器  

Wide-range external-cavity tunable semiconductorlaser with mode-hopping free

作　　者：盛立文 葛崇琳 曹乾涛 黄琳 赵众安 李龙菲 乔山 张爱国 韦育 金辉 张志辉 刘加庆 白振旭 刘志明 Sheng Liwen;Ge Chonglin;Cao Qiantao;Huang Lin;Zhao Zhongan;Li Longfei;Qiao Shan;Zhang Aiguo;Wei Yu;Jin Hui;Zhang Zhihui;Liu Jiaqing;Bai Zhenxu;Liu Zhiming(Ceyear Technologies Co.,Ltd.,Qingdao 266555,China;School of Electronic Engineering,Xidian University,Xi’an 710071,China;School of Information Science and Engineering,Shandong University,Qingdao 266237,China;Center for Advanced Laser Technology,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]中电科思仪科技股份有限公司,山东青岛266555 [2]西安电子科技大学电子工程学院,陕西西安710071 [3]山东大学信息科学与工程学院,山东青岛266237 [4]河北工业大学先进激光技术研究中心,天津300401

出　　处：《红外与激光工程》2023年第8期152-158,共7页Infrared and Laser Engineering

基　　金：国家重点研发计划项目(2022YFF0705900,2022YFF0707102);青岛市博士后应用研究项目(20266153,21290111);电子测试技术重点实验室开放基金项目(ZF332);山东省博士后创新项目(202103076)。

摘　　要：具有宽调谐范围、无跳模以及高光谱纯净度的半导体激光器在超精细光谱、相干检测和光纤智能感知等领域有着重要的应用。但是受到半导体激光器固有运转特性的制约,通过传统的单片集成式半导体激光器难以获得高光谱纯净度的宽范围可调谐激光输出。因此文中采用闪耀光栅作为外腔反馈元件,单角面度半导体增益芯片作为增益介质,通过Littman-Metcalf外腔振荡结构实现了1 480~1 580 nm的宽调谐范围、无模式跳变的线宽小于98.27 kHz的激光输出,在注入电流为410 mA的条件下获得了16.95 dBm的峰值功率、全范围功率优于14.96 dBm和边模抑制比优于65.54 dB的输出。相应的实验结果表明:采用机械刻划闪耀光栅的Littman-Metcalf结构用于半导体激光器,可很大程度的改善半导体激光器的综合性能。该研究有利于推动其在提升光频域反射仪测量精度方向的应用。Objective External-cavity tunable semiconductor laser(ETSL)has been widely studied and acted as a prior selected laser source for its prestigious characteristics such as broad wavelength tuning range,single mode,narrow linewidth,and compactness.However,limited by the intrinsic operation characteristics of currently available semiconductor lasers,it is difficult to obtain a wide-range tunable laser beam output with high spectral purity directly generated by traditional monolithic semiconductor lasers.Particularly,most applications require that the output wavelength of the ETSL can be scanned continuously over time.Consequently,it is critical to build and maintain an ETSL system with a wide mode-hopping free tuning range. For this purpose, a Littman-Metcalf external-cavity oscillation structure is designed in this paper.Methods First, according to the principle and characteristics of the Littman-Metcalf external-cavity oscillationstructure, a 900 grooves/mm blazed grating is used as the external-cavity feedback element, single-angled facetgain chip is served as the laser gain medium (Fig.1). Then, the threshold current performance of the ETSL systemis characterized by measuring the output optical power at different lasing wavelengths to determine a minimumworking current (Fig.3(a)). Finally, the linewidth of the ETSL system with a wide mode-hopping free tuningrange at different lasing wavelengths are compared (Fig.6).Results and Discussions The designed total physical lengths of the laser cavity are changed to obtainsuperimposed optical spectra for different resonance wavelengths. The injection current is fixed at 410 mA andthe ambient temperature is adjusted at 25 ℃, and the tuning range results are highlighted (Fig.3(c)). The singlemodeoperation of different lasing wavelength can be clearly identified, and the side mode suppression ratio of thesystem satisfies the demand of optical frequency reflectormeter. Meanwhile, the peak output power of 16.95 dBm,full range power of better than 14.96 dBm are obtained (Fig

关 键 词：无跳模 外腔 可调谐 半导体激光光源 窄线宽 

分 类 号：TN243[电子电信—物理电子学]