Sub-Doppler Spectroscopy of Molecular Iodine at 531 nm Using a Frequency-Doubled α-Distributed Feedback Laser

[[abstract]]We report, for the first time, the observation of the iodine hyperfine transitions at 531 nm using a frequency-doubled α-distributed feedback (α-DFB) laser. The moderate high power of the α-DFB laser allows us to generate the second harmonic light by a periodically-poled LiNbO3 single-pass frequency doubler. We can stabilize this laser frequency to the hyperfine component a10 of R(94) 34-0 or R(70) 33-0 I2 line, and the preliminary frequency stability was about 5×10-11. This laser system is an attractive frequency standard at 531 nm due to its compact size, high reliability, and low cost.[[fileno]]2010123010049[[department]]物理