Chang Hongrok, Myneni Krishna, Smith David D, Liaghati-Mobarhan Hassan R
General Atomics, Electromagnetic Systems, 678 Discovery Dr., Huntsville, Alabama 35806, USA.
U.S. Army Aviation and Missile Research, Development, and Engineering Center, Redstone Arsenal, Alabama 35898, USA.
Rev Sci Instrum. 2017 Jun;88(6):063101. doi: 10.1063/1.4985544.
We show that the optical output of a temperature and current-tuned Fabry-Perót diode laser system, with no external optical feedback and in which the frequency is locked to Doppler-free hyperfine resonances of the Rb D line, can achieve high frequency stability and accuracy. Experimental results are presented for the spectral linewidth, frequency stability, and frequency accuracy of the source. Although our optical source is limited by a short-term spectral linewidth greater than 2 MHz, beat signal measurements from two such sources demonstrate a frequency stability of 1.1 kHz, or minimum Allan deviation of 4×10, at an integration time τ=15 s and with a frequency accuracy of 60 kHz at τ=300 s. We demonstrate the use of the optical source for the precision measurement of hyperfine level frequency spacings in the 5P excited state of Rb and provide an accurate frequency scale for optical spectroscopy.
我们表明，在没有外部光反馈的情况下，温度和电流调谐的法布里 - 珀罗二极管激光系统的光输出，其频率锁定到铷D线的无多普勒超精细共振，可以实现高频率稳定性和精度。给出了该光源的谱线宽度、频率稳定性和频率精度的实验结果。尽管我们的光源受到大于2 MHz的短期谱线宽度的限制，但来自两个这样的光源的拍频信号测量表明，在积分时间τ = 15 s时频率稳定性为1.1 kHz，或最小阿伦偏差为4×10，在τ = 300 s时频率精度为60 kHz。我们展示了该光源用于精确测量铷5P激发态中超精细能级频率间隔的用途，并为光谱学提供了精确的频率标度。
