Laser power stabilization systems with time sequence control
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摘要: 在锶原子光晶格钟实验中,为了应对多变的实验环境和复杂的实验需求,使得某些光路中的激光不仅能够保证功率稳定,还可以进行时序性调控,采用了声光调制的方法,基于声光晶体的衍射效率随加载于其上的射频功率变化而变化这一原理,建立了一套反馈控制系统,实现了激光功率的主动稳定以及功率设定值的时序性可控。结果表明,在该系统中激光会根据时序控制信号稳定地工作在控制范围内的任意功率强度上,与无功率稳定的状态相比,激光功率的稳定度从10-2量级提高到了10-4量级。该系统的特点在于能够对功率进行稳定的时序控制。Abstract: In order to cope with changeable environment and complex requirements of strontium optical lattice clock experiments, laser power should be stabilized and controlled in time sequence in some laser paths. Acousto-optic modulation was adopted to stabilize the laser power based on the principle that diffraction efficiency of acousto-optic crystal varies with the change of driving radio frequency power. A feedback control system was established to realize active stabilization of laser power and timing control of power. The result shows that laser power can be set at arbitrary levels within its setting range according to time sequence. When the control system is enabled, the relative laser power stability is improved from 10-2 to 10-4 compared with the disabled state. The advantage of the system is power stability with timing control.
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