双腔双频固体激光器正交解调PDH稳频系统设计及研究

发布时间：2018-05-16 23:12

本文选题：双腔双频固体激光器 + Pound-Drever-Hall稳频　；参考：《西安理工大学》2017年硕士论文

【摘要】：大频差可调谐双腔双频固体激光器是合成波长绝对距离干涉测量系统的理想光源。在绝对距离干涉测量技术中,不仅要求合成波长具有合适的量值大小,而且要求合成波长具有较高的稳定性,以提高测距精度。合成波长的量值大小取决于双频激光器的频差大小,要保证合成波长的稳定性,就必须保证双频激光器的频差稳定性。因此,开展双腔双频激光器频率稳定技术研究具有重要的科学意义和应用价值。本论文在综述激光稳频技术研究现状的基础上,分析了双腔双频固体激光器的结构特点和工作原理,介绍了传统Pound-Drever-Hall (PDH)稳频系统的组成和工作原理及特点,设计了基于正交解调原理的双腔双频固体激光器PDH稳频方案,采用正交解调PDH稳频方法,将直线腔和直角腔谐振频率同时锁定在同一 F-P参考腔的两个不同谐振峰中心频率处,从而稳定双频激光的频差大小。针对传统PDH稳频系统采用移相器所带来的缺陷,设计了无移相器的正交解调PDH稳频方案,采用正交参考信号分别提取误差信号的同相分量和正交分量,再通过数字相敏检波运算得到稳频误差信号。实验研究了单腔单频固体激光器正交解调PDH鉴频特性及频率跟踪特性。建立了1064nm单频固体激光器正交解调PDH鉴频实验系统,鉴频系统的线性动态范围约为8.39MHz,鉴频灵敏度为24.4mV/MHz,并分析了影响鉴频灵敏度的主要原因;将正交解调PDH鉴频误差信号反馈调节F-P参考腔的腔长,使F-P腔谐振频率实时跟踪单频固体激光器谐振频率的变化,实验得到了预期的频率跟踪效果,频率跟踪时长约1h,实验验证了正交解调PDH稳频方案是可行的。建立了双腔双频固体激光器正交解调PDH稳频系统,并进行了初步实验研究,研究结果验证了该稳频方案的可行性。
[Abstract]:Large frequency difference tunable two-cavity double-frequency solid-state laser is an ideal light source for synthetic wavelength absolute distance interferometry system. In absolute distance interferometry, the synthetic wavelength is not only required to have an appropriate value, but also to have high stability to improve the ranging accuracy. The magnitude of the synthetic wavelength depends on the frequency difference of the dual-frequency laser. In order to ensure the stability of the synthetic wavelength, the stability of the frequency difference of the dual-frequency laser must be guaranteed. Therefore, it is of great scientific significance and application value to study the frequency stabilization technology of dual-cavity dual-frequency lasers. On the basis of summarizing the research status of laser frequency stabilization technology, this paper analyzes the structure and working principle of dual-cavity dual-frequency solid-state laser, and introduces the composition, working principle and characteristics of the traditional Pound-Drever-Hall frequency stabilization system. Based on the principle of quadrature demodulation, a dual-cavity dual-frequency solid-state laser PDH frequency stabilization scheme is designed. By using the orthogonal demodulation PDH stabilization method, the resonant frequencies of the linear cavity and the right-angle cavity are locked simultaneously at the central frequencies of two different resonant peaks in the same F-P reference cavity. In order to stabilize the frequency difference of double frequency laser. Aiming at the defects caused by the phase shifter used in the traditional PDH frequency stabilization system, a phase shifter free quadrature demodulation PDH frequency stabilization scheme is designed. The quadrature reference signal is used to extract the in-phase and quadrature components of the error signal, respectively. Then the frequency stabilization error signal is obtained by digital phase sensitive detection operation. The frequency discrimination and frequency tracking characteristics of single cavity single frequency solid state laser with orthogonal demodulation PDH are studied experimentally. The experimental system of 1064nm single-frequency solid-state laser quadrature demodulation PDH frequency discriminator is established. The linear dynamic range of the system is about 8.39 MHz, and the sensitivity of frequency discrimination is 24.4 MV / MHz. the main reasons that affect the frequency discrimination sensitivity are analyzed. The feedback of the quadrature demodulation PDH frequency discrimination error signal is used to adjust the cavity length of the F-P reference cavity, so that the resonant frequency of the F-P resonator can be tracked in real time. The experimental results show that the desired frequency tracking effect is obtained. The frequency tracking time is about 1 h. The experiment results show that the quadrature demodulation PDH stabilization scheme is feasible. A dual-cavity dual-frequency solid-state laser quadrature demodulation PDH frequency stabilization system is established, and a preliminary experimental study is carried out. The research results verify the feasibility of the scheme.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248

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