环形光纤激光器自混合散斑数值模拟及频谱性能分析  

Self-mixing Speckle Numerical Simulation and Frequency Spectrum Capability Based on the Ring Fiber Laser

作　　者：左秀婷[1] 韩道福[2] 马力[2] 

机构地区：[1]南昌大学物理学系,江西南昌330031 [2]南昌大学基础物理实验中心,江西南昌330031

出　　处：《南昌大学学报（理科版）》2009年第5期472-475,共4页Journal of Nanchang University(Natural Science)

基　　金：国家自然科学基金资助项目(60808019);江西省自然科学基金资助项目(2008GQW0002)

摘　　要：在环形激光器的理论基础上,结合环形掺铒光纤激光器自混合散斑速度传感实验系统,数值模拟了激光器自混合散斑信号的功率输出。分析了自混合散斑信号的平均散斑频率,频谱能量密度性能。研究结果表明,频谱平均频率与物体速度成近似的线性关系,频谱能量密度与探测距离成近似线性关系。Based on the theory of the fiber ring laser, self - mixing speckle generated in an erbium - doped fiber laser is theoretically studied and numerically simulated. The self - mixing speckle signals produced by simulation representing different velocities are analyzed by fast Fourier transform （FFT）, and the result shows that the mean speckle frequency and spectrum energy density of the self - mixing signal are respectively linear related with the velocity and the detecting distance of the dynamic object. The results indicate that self - mixing speckle in an erbium - doped optical fiber laser can be used to the measurement of a dynamic object.

关 键 词：环形激光器 自混合散斑信号 数值模拟 动态测量 

分 类 号：O439[机械工程—光学工程]