Theoretical analysis and experimental research on the polarization properties of output light in gyro are carried out to investigate the phenomenon that the amplitude of an output voltage signal is modulated by dither...Theoretical analysis and experimental research on the polarization properties of output light in gyro are carried out to investigate the phenomenon that the amplitude of an output voltage signal is modulated by dither bias in laser gyros consisting of totally reflecting prisms.Taking the effect of prism stress birefringence into account,an analytical formula of the output light intensity in the gyro and the relationship between the polarization parameter and the amplitude modulation of the output signal are obtained and discussed.For the first time,the polarized power value of the output light is adopted as a basis to estimate the output signal amplitude fading extent of laser gyros.Experimental results demonstrate that when the value of polarized power of output light is below 25.5%of that in ideal static case,the standard error is over 0.0337 dBm,and the displacement extent of the prism is higher than 53%of the radius of the beam waist in the gyro cavity,the amplitude modulation extent of gyro output signal can reach up to 16%,which badly influences the measurement accuracy of the laser gyro.Using this polarized power detecting measurement method can repair the gyro immediately during its fabrication process,improve the testing and production efficiency and shorten the product development cycle.展开更多
激光器的偏振特性在一定程度上反映了激光器的性能优劣,激光器的出射光束的偏振状态对材料加工的效率与质量均有重大影响。材料对激光束的光谱吸收不仅由材料本身的光学性质决定,还与激光束的偏振状态有直接关系。本文主要通过依据激光...激光器的偏振特性在一定程度上反映了激光器的性能优劣,激光器的出射光束的偏振状态对材料加工的效率与质量均有重大影响。材料对激光束的光谱吸收不仅由材料本身的光学性质决定,还与激光束的偏振状态有直接关系。本文主要通过依据激光准直透镜的光学原理、偏振分光棱镜的双折射分光特性、1/2波片能够改变激光光束偏振态的特性等几个要素,对COS(Chip on sub-mount)封装形式的半导体激光芯片的偏振特性进行检测与分析,文章先阐述了测试半导体激光芯片偏振特性的目的,从而引出了以COS封装形式的880nm半导体激光芯片为例的激光偏振特性的测试方法、相应的检测装置以及影响封装型半导体激光芯片偏振特性的因素。展开更多
基金Project supported by the National High Technology Research and Development Program of China(Grant No.2006AA12Z144)
文摘Theoretical analysis and experimental research on the polarization properties of output light in gyro are carried out to investigate the phenomenon that the amplitude of an output voltage signal is modulated by dither bias in laser gyros consisting of totally reflecting prisms.Taking the effect of prism stress birefringence into account,an analytical formula of the output light intensity in the gyro and the relationship between the polarization parameter and the amplitude modulation of the output signal are obtained and discussed.For the first time,the polarized power value of the output light is adopted as a basis to estimate the output signal amplitude fading extent of laser gyros.Experimental results demonstrate that when the value of polarized power of output light is below 25.5%of that in ideal static case,the standard error is over 0.0337 dBm,and the displacement extent of the prism is higher than 53%of the radius of the beam waist in the gyro cavity,the amplitude modulation extent of gyro output signal can reach up to 16%,which badly influences the measurement accuracy of the laser gyro.Using this polarized power detecting measurement method can repair the gyro immediately during its fabrication process,improve the testing and production efficiency and shorten the product development cycle.
文摘激光器的偏振特性在一定程度上反映了激光器的性能优劣,激光器的出射光束的偏振状态对材料加工的效率与质量均有重大影响。材料对激光束的光谱吸收不仅由材料本身的光学性质决定,还与激光束的偏振状态有直接关系。本文主要通过依据激光准直透镜的光学原理、偏振分光棱镜的双折射分光特性、1/2波片能够改变激光光束偏振态的特性等几个要素,对COS(Chip on sub-mount)封装形式的半导体激光芯片的偏振特性进行检测与分析,文章先阐述了测试半导体激光芯片偏振特性的目的,从而引出了以COS封装形式的880nm半导体激光芯片为例的激光偏振特性的测试方法、相应的检测装置以及影响封装型半导体激光芯片偏振特性的因素。
