A 420 nm Blue Diode Laser for the Potential Rubidium Optical Frequency Standard

摘要

We report a 420 nm external cavity diode laser with an interference filter (IF) of 0.5 nm narrow-bandwidth and 79％ high transmission,which is first used for Rb optical frequency standard.The IF and the cat-eye reflector are used for selecting wavelength and light feedback,respectively.The measured laser linewidth is 24 kHz when the diode laser is free running.Using this narrow-linewidth IF blue diode laser,we realize a compact Rb optical frequency standard without a complicated PDH system.The preliminary stability of the Rb optical frequency standard is 2 × 10-13 at 1 S and decreases to 1.9 × 10-14 at 1000s.The narrow-linewidth characteristic makes the IF blue diode laser a well suited candidate for the compact Rb optical frequency standard.