Stabilization of mini-Nd: YVO4 laser using I2 hyperfine transition

By using a diode-pumped Nd:YVO4 / KTP intracavity frequency-doubling mini-laser and frequency modulation optical heterodyne spectroscopy, we have obtained spectrum of127I2 hyperfine structure near 532 nm. The laser frequency is locked to hyperfine transitions of I2. The analysis of error servo signal demonstrates that the laser frequency stability can reach 10 12 at 1 second average time.