Abstract
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 TEM00 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 noise are reduced to , and a beat linewidth of 193 mHz is obtained. The linewidth is of frequency 0.73 times the Schawlow–Townes limit.
© 1993 Optical Society of America
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