Abstract
The author demonstrates the evaluation of the subhertz instantaneous linewidth of a nonplanar monolithic Nd:YAG ring laser emitting at 1064 nm with 3.9 mW output power from a precise heterodyne relative intensity noise (RIN) measurement. The relaxation resonant frequency, the maximum RIN density at the relaxation resonance, and the relaxation peak width are: 220 kHz, -83 dB/Hz, and 4.5 kHz, respectively, which yield an instantaneous linewidth of 80 mHz. The result is in good agreement with those obtained by other methods.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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