Manipulation of Carrier-Envelope-Offset to suppress frequency-to-intensity noise conversion in a pulsed laser-optical cavity locked system.

Enhancement optical cavities locked to pulsed laser systems have a crucial role in storing extremely high optical power for a wide range of applications, spanning from high-sensitivity spectroscopy to coherent UV light and X-rays generation. Unfortunately, frequency and intensity noises threaten the stability of the radiation trapped inside the enhancement cavity, hence noise-reduction techniques are crucial for an effective implementation of laser-cavity coupled systems. At the 108th SIF Congress, we will discuss the dependence of the frequency-to-intensity noise conversion in the locking of an ultrafast laser against a high-finesse optical enhancement resonator from the Carrier Envelope Offset (CEO) frequency. By a proper combination of the cavity finesse and laser CEO frequency, it is possible to significatively optimize the signal-to-noise ratio of the laser intensity trapped into the optical resonator. The theoretical description of the problem together with the numerical simulations and experimental results will be presented with the aim of a relevant suppression of the intensity fluctuations of the trapped laser field.