We developed and implemented a miniature electro-optical bench for the stabilization of a dual-frequency laser beam for high-contrast CPT interrogation of cesium. Preliminary results of optical intensity and wavelength simultaneous stabilizations give respective noise reduction of 15 dB and 60 dB at low frequencies. These performances are in line with targeted clock stability of 5×10-13 at 1 s. For longer time scales, a study of the optical power stability shows a drastic reduction of power fluctuations and highlights the temperature sensitivity of the optical components.
Atomic clocks based on Coherent Population Trapping (CPT) in cesium [1] or other sensors based on CPT require the development of specific low noise laser sources at resonant wavelengths. For instance, the double lambda scheme for CPT probed by lin ⊥ lin laser beams, which has been shown to create Raman–Ramsey fringes with a larger contrast than the usual simple lambda scheme in [2], requires the availability of two cross-linearly polarized frequencies at 852 nm with a low beat note phase noise and a low intensity noise. One way to generate these two frequencies with low amplitude and phase noises is to build a dual-frequency VECSEL (Vertical External Cavity Surface Emitting Laser) [3]. In this talk we will present our efforts to understand the physical origin of the laser amplitude and phase noises [4], and the developments that we have made to reduce these noises to the levels necessary to achieve a relative clock stability of 10-13 at 1 s integration time.
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