Rein Benjamin, Walther Thomas
Opt Lett. 2017 Apr 15;42(8):1508-1511. doi: 10.1364/OL.42.001508.
We report on a frequency stabilized laser system with a variable linewidth at a wavelength of 404.7 nm used as an incoherent repump on the 6P3↔7S3 transition in mercury. By directly modulating the laser diode current with Gaussian white noise, the laser linewidth can be broadened up to 68 MHz. A Doppler-free dichroic atomic vapor laser lock spectroscopy provides an error signal suitable for frequency stabilization even for the broadened laser. Without the need of an acousto-optic modulator for the linewidth tuning or lock-in technique for frequency stabilization, this laser system provides an inexpensive approach for an incoherent and highly efficient repumper in atomic experiments.
我们报道了一种频率稳定的激光系统，其波长为404.7 nm，线宽可变，用作汞中6P3↔7S3跃迁的非相干再泵浦光。通过用高斯白噪声直接调制激光二极管电流，激光线宽可拓宽至68 MHz。一种无多普勒双色原子蒸气激光锁定光谱技术可提供适用于频率稳定的误差信号，即使对于拓宽后的激光也是如此。该激光系统无需用于线宽调谐的声光调制器或用于频率稳定的锁相技术，为原子实验中的非相干且高效的再泵浦光提供了一种低成本的方法。
