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High-spectral purity RF beat note generated by a two-frequency solid-state laser in a dual thermooptic and electrooptic phase-locked loop

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7 Author(s)
Brunel, M. ; Lab. de Phys. des Lasers, Univ. de Rennes I-CNRS, France ; Bretenaker, F. ; Blanc, S. ; Crozatier, V.
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Ultralow noise stabilization of a two-frequency solid-state laser is experimentally demonstrated using a specially designed dual phase-locked loop. Thanks to an intracavity birefringent crystal providing both thermooptic and electrooptic frequency modulation properties, the laser delivers a beat frequency that is controlled by both pump power and voltage from 0 to 1000 MHz. When phase-locked against a radio-frequency synthesizer, the beat note has a 25-mHz full-width at half-maximum. The measured phase noise is -110 dBc/Hz at 10-kHz offset, and lower than -130 dBc/Hz at 1-MHz offset and above. Improvements and applications to local oscillators in microwave-photonic systems are discussed.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 3 )