The frequency of a 700-mW monolithic nonplanar Nd:YAG ring laser (NPRO) depends, with a large coupling coefficient (megahertz per milliwatt), on the power of its laser-diode pump source. Using this effect, we demonstrate frequency stabilization of a NPRO to a frequency reference by feeding back to the current of its pump diodes. We achieved an error-point frequency noise smaller than 1mHz/√Hz and, simultaneously, a reduction of the power noise of the NPRO by 10 dB without an additional power-stabilization feedback system.
© 2000 Optical Society of America
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(140.3530) Lasers and laser optics : Lasers, neodymium
B. Willke, S. Brozek, K. Danzmann, V. Quetschke, and S. Gossler, "Frequency stabilization of a monolithic Nd:YAG ring laser by controlling the power of the laser-diode pump source," Opt. Lett. 25, 1019-1021 (2000)