激光二极管自混合干涉和激光的频移  

Self-Mixing Interference in Laser Diode and Frequency Shift of Laser

作　　者：胡险峰[1] 

机构地区：[1]四川大学物理科学与技术学院,四川成都610064

出　　处：《光学学报》2010年第12期3501-3507,共7页Acta Optica Sinica

摘　　要：在自混合干涉中激光频率受外腔反馈和外腔反射面运动的影响。由内外复合腔模型给出激光二极管(LD)谐振腔前后端面出射的光场,外腔反馈和外腔运动引起的激光频移,以及自混合干涉信号的频率。实验观察外腔反馈引起的激光频移和自混合干涉信号的频谱。激光的频移包括谐振频移和运动频移,在外腔反射面运动频率较低时,谐振腔前后端面出射光的频移近似相同为谐振频移。外腔反射面高频运动时,谐振腔前后端面出射光的频移不相同,前端面出射光频移会由运动频移决定。外腔反馈极弱时,自混合干涉信号的频率与反射光多普勒频移相同,外腔反馈增强,随外腔反射面振动自混合干涉信号的频率存在尖锐振荡,其最大频率超过反射光多普勒频移的1.6倍。Light feedback of external cavity and movement of external cavity mirror in self-mixing interference affect laser frequency.Light fields out of front and rear facets on internal cavity,frequency shift of laser and frequency of self-mixing interference signal are introduced from a model of complex resonant cavity.Frequency shift of laser and frequency spectra of self-mixing interference signal are observed in experiment.Frequency shift of laser is made up resonance frequency shift and movement frequency shift.At lower moving frequency of external cavity mirror,frequency shift of laser out of the front and rear facets are almost the same as resonance frequency shift.At higher moving frequency of external cavity mirror,frequency shift of laser out of the front and rear facets are different from each other.Frequency shift of laser out of the front facet may be dominated by movement frequency shift.Frequency of self-mixing interference signals at extremely weak feedback light is the same as Doppler frequency shift of feedback light.Frequency of self-mixing interference signal at weak feedback light vibrates sharply and its highest frequency is more than 1.6 times of Doppler frequency shift of feedback light.

关 键 词：光学测量 激光二极管 自混合干涉 激光频率 多普勒频移 有源法布里珀罗腔 

分 类 号：TN248.4[电子电信—物理电子学]