17 February 2017 Highly stable RF signal from a mode-locked laser stabilized to multiple saturated absorption lines
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Abstract
We control the optical comb in Nd:YVO4 mode-locked lasers with intracavity frequency doubling based on KTP crystals via changing the cavity length and its dispersion properties and achieve high-purity radiofrequency (RF) signals. The laser output wavelength (532 nm) is in the range of the molecular iodine absorption spectrum with narrow (1.5 kHz) homogeneously broadened lines. We propose to stabilize the two longitudinal modes on two narrow iodine absorption lines. The third derivative of the absorption line could be obtained by heterodyning the absorption signal with the third harmonic of the modulation signal. The resulting RF error signal could be used to stabilize two locked longitudinal modes separated by 1.37 GHz which results in stabilized beat note signal.
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Anton V. Kovalev, Alexander V. Uskov, Vadim M. Polyakov, "Highly stable RF signal from a mode-locked laser stabilized to multiple saturated absorption lines", Proc. SPIE 10082, Solid State Lasers XXVI: Technology and Devices, 100821Z (17 February 2017); doi: 10.1117/12.2251527; https://doi.org/10.1117/12.2251527
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