一种基于光弹簧效应的腔光机械锁定方案
A cavity optomechanical locking scheme based on the optical spring effect
摘要：
提出了一种基于光弹簧效应的腔光机器件主动稳长和频率失谐锁定方案。该方案可以作为替代的Pound-Drever-Hall锁定技术，但相比之下，不需要信号处理的时间尺度上的腔衰减率。因此，它特别适合于稳定微腔，其中该时间尺度可以非常快。误差信号通过光学弹簧效应产生，即，色散耦合到腔内光场的纳米机械振荡器的失谐相关频移。我们解释了锁定的功能原理，并在带宽和增益曲线方面表征其性能。光学弹簧锁定方案可以在各种光学机械系统中在未分辨边带区域中不需要更大的努力而实现。
英文摘要：
We present a novel locking scheme for active length-stabilization and frequency detuning of a cavity optomechanical device based on the optical spring effect. The scheme can be used as an alternative to the Pound-Drever-Hall locking technique but in contrast doesn't require signal processing on time-scales of the cavity decay rate. It is therefore particularly suited for stabilizing micro cavities, where this time-scale can be extremely fast. The error signal is generated through the optical spring effect, i.e. the detuning-dependent frequency-shift of a nanomechanical oscillator that is dispersively coupled to the intra-cavity light field. We explain the functional principle of the lock and characterize its performance in terms of bandwidth and gain profile. The optical spring locking scheme can be implemented without larger efforts in a wide variety of optomechanical systems in the unresolved sideband regime.
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