DBR单纵模光纤激光器波长温度调谐  

Wavelength tuning with temperature in single longitudinal mode DBR fiber laser

作　　者：陈磊 朱嘉婧 李磐 刘河山 柯常军[1,2] 余锦 罗子人 Chen Lei;Zhu Jiajing;Li Pan;Liu Heshan;Ke Changjun;Yu Jin;Luo Ziren(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;University of Chinese Academy of Sciences,Beijing 100049,China;Beijing Institute of Aerospace Control Devices,Beijing 100039,China;National Microgravity Laboratory,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100094 [2]中国科学院大学,北京100049 [3]北京航天控制仪器研究所,北京100039 [4]中国科学院力学研究所国家微重力实验室,北京100190

出　　处：《红外与激光工程》2023年第4期74-81,共8页Infrared and Laser Engineering

基　　金：国家重点研发计划(2021YFC2201803);国家自然科学基金(61975205)。

摘　　要：报道了采用DBR方式,利用8 mm的高浓度掺Yb3+单模光纤,实现了波长为1064 nm的单纵模调谐激光稳定输出的实验结果。该DBR谐振腔有效腔长为16 mm,输出最大功率为7.4 mW,通过半导体制冷器温控改变谐振腔的温度,实现了0.824 nm的单纵模无跳模调谐。采用光纤外差法,并利用低损耗环形器和光纤反射镜倍增延迟线长度提升测量精度的方式,测量得到激光最大线宽为4.4 kHz。单纵模激光的弛豫震荡峰位于900 kHz处,其相对强度噪声为-110 dB/Hz,当频率大于1.5 MHz时相对强度噪声为-145 dB/Hz。Objective Distributed Bragg reflection(DBR)single longitudinal mode fiber lasers have been widely studied and applied due to their simple resonant cavity structure and good stability.However,the narrow tuning range of current DBR lasers limit their applications in many important fields such as spectral synthesis,laser frequency locking,and coherent detection,etc.Therefore,how to improve its tuning range is of greater research value.And improving the mode-free hopping tuning range of DBR fiber lasers has become the research objective in this study.Methods First of all,according to the principle that the center wavelength of fiber grating drifts is caused by resonant cavity temperature change,the equivalent length theory of the fiber grating,the longitudinal mode spacing theory,and the relationship between the gain spectrum of the doped fiber and the intracavity mode competition,the mechanism of DBR single longitudinal mode fiber laser to achieve single longitudinal mode output and the variation of the longitudinal mode in the resonant cavity during the temperature tuning process are theoretically analyzed.Secondly,DBR single longitudinal mode fiber lasers were built based on the theoretical analysis,and two DBR lasers with different equivalent cavity lengths were constructed by using two different lengths of doped fibers.A temperature controller built with a Thermoelectric Cooler(TEC)and a brass sheet was used to control the temperature of the resonant cavity,and the variation of the center wavelength of the output laser and the longitudinal mode of the output laser during the change of the resonant cavity temperature from 0℃to 100℃were tested.Results and Discussions As a result,the conditions that the cavity length of the resonant cavity of DBR single longitudinal mode fiber laser needs to meet in order to realize the temperature tuning without hopping mode are deduced.Besides,different single and multiple longitudinal mode output results during temperature tuning of lasers with different equivalent cavity le

关 键 词：光纤激光器 单频 温度调谐 分布布拉格反射 

分 类 号：TN248[电子电信—物理电子学]