Gunawardena Mevan, Hess Paul W, Strait Jared, Majumder P K
Physics Department, Williams College, Williamstown, Massachusetts 01267, USA.
Rev Sci Instrum. 2008 Oct;79(10):103110. doi: 10.1063/1.3006386.
We present a simple method for diode laser frequency stabilization that makes use of a Doppler-broadened vapor cell absorption signals of two frequency-shifted laser beams. Using second-order-diffracted, double-passed beams from an acousto-optic modulator, we achieve a frequency separation roughly equal to the Doppler half width. The differential transmission signals of the two beams provide an error signal with a very large linear feature, allowing frequency stabilization over a range of greater than 1 GHz by means of standard proportional-integral-derivative servo feedback to the piezoelectric control of the grating in our external cavity diode laser. We have applied this technique to two different diode laser systems, one used to lock to the 410 nm E1 transition in indium and another for locking to the M1/E2 transition in thallium at 1283 nm. In both cases the technique reduces frequency fluctuation to roughly 1 MHz over time scales from 10(-3) to 10(2) s.
我们提出了一种用于二极管激光频率稳定的简单方法，该方法利用了两个频移激光束的多普勒加宽蒸汽池吸收信号。通过使用来自声光调制器的二阶衍射、双程光束，我们实现了大致等于多普勒半高宽的频率分离。两束光的差分传输信号提供了具有非常大线性特性的误差信号，通过对我们外腔二极管激光器中光栅的压电控制采用标准的比例-积分-微分伺服反馈，可在大于1 GHz的范围内实现频率稳定。我们已将此技术应用于两个不同的二极管激光系统，一个用于锁定到铟中的410 nm E1跃迁，另一个用于锁定到铊中1283 nm处的M1/E2跃迁。在这两种情况下，该技术在10^(-3)到10^(2) s的时间尺度上都将频率波动降低到大约1 MHz。
