Abstract
We report on the wideband frequency stabilization of a 100-W injection-locked Nd:YAG laser using an external electrooptic modulator made of MgO-doped stoichiometric LiNbO3 crystals. In order to circumvent a phase delay in the frequency control loop caused by an injection-locked slave cavity, the electrooptic modulator was placed at the optical path of the slave output. The realized control bandwidth was 85 kHz, which was four-times wider than that obtained without an external electrooptic modulator. We achieved the frequency noise level suppressed relative to a reference cavity of 6×10-2 Hz/√Hz at around 100 Hz.
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