锁定laser的功率有效频率切换
Power-efficient frequency switching of a locked laser
摘要：
我们展示了一种新的和有效的激光锁定技术，使大的频率跳变，同时保持激光锁定。一个二极管激光器被锁定在一个可变的偏移量从一个多普勒自由的光谱特征的铷蒸汽。这是通过在将光发送到具有声光调制器（AOM）的光谱单元之前对激光进行频移来完成的。锁定激光器的频率准瞬时地在远大于光谱特征的宽度（即，通常的锁定范围）上切换。这是通过同时切换AOM频率和对激光电流施加前馈来实现的。我们的技术的优点是由AOM引起的功率损耗和光束行走不影响主输出光束，而只影响用于光谱学的一小部分光。激光频率的瞬态偏移仅为几MHz，持续时间约为0.2 ms，受到我们锁定电子器件带宽的限制。我们提出的方程描述的瞬态行为的误差信号和激光频率定量。它们与测量结果吻合得很好。该技术也适用于其他类型的激光器。
英文摘要：
We demonstrate a new and efficient laser-locking technique that enables making large frequency jumps while keeping the laser in lock. A diode laser is locked at a variable offset from a Doppler-free spectral feature of rubidium vapor. This is done by frequency shifting the laser before sending the light to a spectroscopy cell with an acousto-optic modulator (AOM). The frequency of the locked laser is switched quasi-instantaneously over much more than the width of the spectral features, i.e. the usual locking range. This is done by simultaneously switching the AOM frequency and applying feed-forward to the laser current. The advantage of our technique is that power loss and beam walk caused by the AOM do not affect the main output beam, but only the small fraction of light used for the spectroscopy. The transient excursions of the laser frequency are only a few MHz and last approximately 0.2 ms, limited by the bandwidth of our locking electronics. We present equations that describe the transient behavior of the error signal and the laser frequency quantitatively. They are in good agreement with the measurements. The technique should be applicable to other types of lasers.
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