Uehara N, Ueda K
Opt Lett. 1993 Apr 1;18(7):505-7. doi: 10.1364/ol.18.000505.
We describe frequency-stabilized laser-diode-pumped Nd:YAG ring lasers locked to a high-transmission and high-finesse reference Fabry-Perot cavity. The cavity has a resonant linewidth of 38.0 kHz, a finesse of 19,400, and a transmission efficiency of 79.4% for the TEM(00) mode. We measure the frequency stability by locking two lasers one free spectral range apart and observe the heterodyne beat signal. As a result, the spectral densities of frequency noise are reduced to 10 mHz/ radicalHz, and a beat linewidth of 193 mHz is obtained. The linewidth is 0.73 times the Schawlow-Townes limit.
我们描述了频率稳定的激光二极管泵浦Nd:YAG环形激光器，其锁定到一个高透射率和高精细度的参考法布里-珀罗腔。该腔对于TEM(00)模式具有38.0 kHz的谐振线宽、19400的精细度以及79.4%的传输效率。我们通过锁定两个相隔一个自由光谱范围的激光器并观察外差拍频信号来测量频率稳定性。结果，频率噪声的谱密度降低到10 mHz/√Hz，并且获得了193 mHz的拍频线宽。该线宽是肖洛-汤斯极限的0.73倍。
