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 $10\hspace{0.17em}\text{mHz}/\sqrt{\text{Hz}}$, 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

Frequency-stabilized laser-diode-pumped Nd:YAG laser

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