Abstract
A stable deep-ultraviolet (DUV) laser for laser cooling of mercury atoms using the 1S0-3P1 transition at 253.7 nm, which is based on a fiber laser amplifier with an extended cavity diode laser (ECDL) seed laser and two stages of frequency doubling with a PPLN crystal and a BBO doubling cavity respectively, has been developed. To improve the power stability, the seed laser is frequency-stabilized on a Fabry-Pérot cavity and the output power of green light is power-stabilized by a feedback servo loop. Finally, the output power of DUV light achieves 0.3% RMS deviation and 1.5% peak-to-peak deviation at 55 mW output power over 1.5 h. The relative intensity noise is lower than −90 dB/Hz above 10 Hz by Pound-Drever-Hall locking to the frequency doubling cavity. A saturated absorption spectrum with high signal-to-noise ratio is observed in a mercury vapor cell with this laser. It will be used as cooling laser of 2D and 3D magneto-optical trap and detection laser in the neutral mercury optical lattice clock.
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