Hyperfine structure of molecular-iodine absorption spectroscopy at 561nm

Abstract

An 1123-nm single-frequency laser with 1-W output power has been made by home, and 10-mW output power double frequency at 561nm is obtained. The modulation transform spectroscopy is used to scan the hyperfine structure lines of molecular iodine absorption spectroscopy transitions at 561nm. Four transition spectroscopy bands of ¹²⁷I2 are observed, and transitions of P(58)22−1 and R(62)22−1 are discussed to be references of 561-nm ¹²⁷I2 optical frequency standard.