698nm超稳激光器优化研究
发布时间：2018-08-12 18:00
【摘要】：具有极高频率稳定性的稳频激光在高分辨率光谱学、光钟、量子信息科学、引力波探测等领域具有重要应用。特别是在时间频率领域,由于其优越的性能和瞩目的进展,锶原子光钟有望成为下一代频率标准。锶原子光钟参考跃迁线的自然线宽在m Hz量级,为了实现锶原子参考跃迁线的精密测量,需要研制具有极高频率稳定度的698nm稳频激光。本实验中,稳频激光系统是以698nm外腔半导体激光器为光源,利用PDH稳频技术将激光频率锁定到光学参考腔共振频率上。2013年,实验室相关研究人员获得了1s频率稳定度为1.4×10~（-14）的稳频激光。通过对稳频结果进行分析,针对系统中仍可能存在的问题,本文主要从伺服控制系统、参考腔温度控制、剩余幅度调制和激光功率等方面开展对698nm稳频激光系统的优化研究工作。在测量光学参考腔精细度的实验中,首次使用偏频法同时测量了参考腔线宽和误差信号电压频率转换关系,有效提高了基于高精细度腔稳激光系统中误差信号斜率的测量精度。在剩余幅度抑制实验中,提出将电光晶体温度控制在剩余幅度最大点的观点,有效降低了激光频率对温度的敏感度。通过文中一系列优化措施,将两套稳频激光系统进行拍频比对,测得拍频信号1s平均时间的频率稳定度为2.65×10~（-15）,其中一套激光系统1s平均时间的频率稳定度优于1.87×10~（-15）,较优化前稳定度提高了约一个量级。
[Abstract]:The steady frequency laser with extremely high frequency stability has important applications in the fields of high resolution spectroscopy, optical clock, quantum information science, gravitational wave detection and so on. Especially in the field of time and frequency, strontium atomic light clock is expected to become the next generation frequency standard due to its superior performance and remarkable progress. The natural linewidth of the reference transition line of strontium atomic clock is in the order of m Hz. In order to realize the precise measurement of the reference transition line of strontium atom, it is necessary to develop 698nm stable frequency laser with very high frequency stability. In this experiment, the frequency stabilized laser system uses 698nm external cavity semiconductor laser as the light source, and uses the PDH frequency stabilization technology to lock the laser frequency onto the optical reference cavity resonance frequency. A frequency stabilized laser with 1 s frequency stability of 1.4 脳 10 ~ (-14) was obtained by laboratory researchers. Through the analysis of the frequency stabilization results, aiming at the possible problems in the system, this paper mainly from the servo control system, reference cavity temperature control, The residual amplitude modulation and laser power are studied on the optimization of 698nm frequency stabilized laser system. In the experiment of measuring the fineness of the optical reference cavity, the bias frequency method is used to measure the relationship between the reference cavity linewidth and the voltage and frequency conversion of the error signal for the first time, which effectively improves the measurement accuracy of the error signal slope in the laser system based on the high precision cavity stabilization. In the residual amplitude suppression experiment, the idea of controlling the temperature of the electro-optic crystal at the maximum residual amplitude is put forward, which effectively reduces the sensitivity of the laser frequency to the temperature. Through a series of optimization measures in this paper, the beat frequency of two stable laser systems is compared. The frequency stability of 1 s average time of beat frequency signal is 2.65 脳 10 ~ (-15). The frequency stability of 1 s average time of a laser system is better than 1.87 脳 10 ~ (-15), which is about one order of magnitude higher than that before optimization.
【学位授予单位】：中国科学院研究生院（国家授时中心）
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248
本文编号：2179853
[Abstract]:The steady frequency laser with extremely high frequency stability has important applications in the fields of high resolution spectroscopy, optical clock, quantum information science, gravitational wave detection and so on. Especially in the field of time and frequency, strontium atomic light clock is expected to become the next generation frequency standard due to its superior performance and remarkable progress. The natural linewidth of the reference transition line of strontium atomic clock is in the order of m Hz. In order to realize the precise measurement of the reference transition line of strontium atom, it is necessary to develop 698nm stable frequency laser with very high frequency stability. In this experiment, the frequency stabilized laser system uses 698nm external cavity semiconductor laser as the light source, and uses the PDH frequency stabilization technology to lock the laser frequency onto the optical reference cavity resonance frequency. A frequency stabilized laser with 1 s frequency stability of 1.4 脳 10 ~ (-14) was obtained by laboratory researchers. Through the analysis of the frequency stabilization results, aiming at the possible problems in the system, this paper mainly from the servo control system, reference cavity temperature control, The residual amplitude modulation and laser power are studied on the optimization of 698nm frequency stabilized laser system. In the experiment of measuring the fineness of the optical reference cavity, the bias frequency method is used to measure the relationship between the reference cavity linewidth and the voltage and frequency conversion of the error signal for the first time, which effectively improves the measurement accuracy of the error signal slope in the laser system based on the high precision cavity stabilization. In the residual amplitude suppression experiment, the idea of controlling the temperature of the electro-optic crystal at the maximum residual amplitude is put forward, which effectively reduces the sensitivity of the laser frequency to the temperature. Through a series of optimization measures in this paper, the beat frequency of two stable laser systems is compared. The frequency stability of 1 s average time of beat frequency signal is 2.65 脳 10 ~ (-15). The frequency stability of 1 s average time of a laser system is better than 1.87 脳 10 ~ (-15), which is about one order of magnitude higher than that before optimization.
【学位授予单位】：中国科学院研究生院（国家授时中心）
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248
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