全内腔绿光He-Ne激光器

采用Needle法,对全内腔绿光He-Ne激光器膜系进行设计,并给出了所设计膜系的光谱性能。利用离子溅射镀膜技术镀制了所设计的膜片并且给出了测量结果。制备了多种规格的全内腔绿光He-Ne激光器并且讨论了相关工艺。其中腔长420mm的全内腔绿光He-Ne激光器的典型输出光功率为3mW（单模）,腔长360mm的典型输出光功率为2mW（单模）,腔长240mm的典型输出光功率为1mW（单模）,腔长100mm的小短管子也能有0．1mw的出光功率。     

二频机抖激光陀螺零偏的温度特性的逐步回归分析

研究了二频机抖激光陀螺的零偏的温度特性。通过重复性温度实验,利用逐步回归法分析了机抖激光陀螺零偏与温度的关系,得到了零偏的实时温度补偿模型。结果表明,二频机抖激光陀螺的零偏和温度、温度速率具有较好的线性关系和重复性,可以通过温度补偿来提高陀螺的精度。     

车载激光多普勒测速仪参数估计的Cramer-Rao下限

考虑到加速度和高斯型包络对激光多普勒测速仪的影响,在引入加速度分量的基础上,研究了高斯包络型多普勒信号的参数估计.根据数理统计的理论,分析了多普勒圆频率及其一阶变化率估计方差的Cramer-Rao下限(CRLB),给出了参数估计方差的CRLB计算公式,并讨论了各参数带修正的功率谱估计.理论分析及仿真结果表明:参数估计方...     

衰减全反射磁镜偏频激光陀螺的理论分析

通过分析常规磁镜在红光波长下制造激光陀螺技术不可行的原因，提出了一种新型的磁镜偏频激光陀螺结构，其核心是利用全内反射结构和掺杂YIG薄膜的横向克尔磁光效应作为偏频技术去克服闭锁的衰减全反向磁镜。     

载体振动对差动激光多普勒测速仪的影响

 为了减小载体振动对传统差动激光多普勒测速仪(LDV)测速精度的影响,提出了Janus配置的差动LDV,并对其速度测量的相对误差进行了理论分析与数值仿真。结果表明：Janus配置技术可以近似反演出载体上下振动时的俯仰角,并对速度进行补偿;载体上下振动对传统差动LDV的测量精度有较大影响,而对Janus配置的差动LDV的影响较小;在Janus配置的差动LDV中,当存在俯仰角且大小一定时,随着载体上下起伏速度与运行速度比值增大,速度测量的相对误差增大;当载体上下起伏速度与运行速度的比值为0.01,俯仰角小于10°时,Janus配置的差动LDV的速度测量的相对误差小于0.2%。     

Precise force measurement method by a Y-shaped cavity dual-frequency laser

A novel precise force measurement based on a Y-shaped cavity dual-frequency laser is proposed.The principle of force measurement with this method is analyzed,and the analytic relation expression between the input force and the change in the output beat frequency is derived.Experiments using a 632.8-nm Y-shaped cavity He-Ne dual-frequency laser are then performed;they demonstrate that the force measurement is proportional to a high degree over almost five decades of input signal range.The maximum scale factor is observed as 5.02×109 Hz/N,with beat frequency instability equivalent resolution of 10-5 N.By optimizing the optical and geometrical parameters of the laser sensor,a force measurement resolution of 10-6 N could be expected.     

A novel optical multilayer hydrophone with a triangular pyramid substrate

A novel concept for an optical multilayer ultrasonic hydrophone with the sensing film deposited on a triangular pyramid glass substrate is proposed.Using the calculation model for the spectral coefficients’ derivatives of a dielectric multilayer optical coating,the acousto-optic sensitivity characteristic of the hydrophone is analyzed with different measurement laser polarizations and incident angles.We present a reasonable method and adjusting strategy for the optimum working point selection of the ultrasound measurement.Analytic results show that the novel hydrophone possesses all the other merits of a plate glass substrate optical multilayer hydrophone but with improved detection sensitivity.A longer measurement time without distortion decreases the difficulty of high frequency signal circuits.Spatial split of the ultrasound signal caused by the substrate’s triangular pyramid roof simplifies the spatial spot area correction,which contributes to the accurate calibration of the hydrophone’s wideband frequency response.     

双纵模He-Ne激光器的拍频稳定度分析

对He-Ne双纵模激光器中两纵模的拍频稳定度进行了讨论.理论上分析了影响双纵模激光拍频稳定度的因素,推导出在考虑了频率牵引效应后双纵模的拍频稳定度和单模频率稳定度之间的关系.计算结果表明对于632.8 nm波长的He-Ne激光器,当频率牵引参量σ1为10-3时,双纵模的拍频稳定度约为其中任一单纵模频率稳定度的1000倍.实验证明当单纵模频率稳定度为1×10-9时,其拍频稳定度为3.3X10-6.     

异面腔四频差动激光陀螺的色散平衡

为了减小异面腔四频差动激光陀螺(DLG)腔长变动导致的零漂,对DLG的色散平衡进行了研究.利用气体激光的经典理论,推导了DLG零偏与工作点和轴向磁场的函数关系,给出了色散平衡的理论证明.利用在DLG增益管上缠绕通电线圈,给增益介质施加大小可控的轴向磁场,通过驱动腔平移镜上的压电换能器调节腔长来改变工作点,做出了零偏随腔长和线圈电流的变化曲线.结果表明,零偏对腔长变化的灵敏度是轴向磁场的函数,当增益曲线的塞曼分裂量等于非互易分裂量时零偏对腔长变动不敏感.色散平衡技术减小了腔变动对DLG的影响,有利于提高DLG精度.     

一种新型多波长绝对距离干涉测量系统的研究

介绍了一种新型多波长绝对距离干涉测量系统。系统采用633nm的双纵模He-Ne激光器和629nm的He-Ne激光器,组成三级合成波长链对较大距离进行精密测量,并作了误差分析。系统采用高稳定度的声光晶体对各波长分别进行偏频,再用外差探测法测量出光束通过参考光路和测量光路后的位相差。简要介绍了629nm的He-Ne激光器的设计方案。