title: Precise frequency measurements of iodine hyperfine transitions at 671 nm.
abstract: We report absolute frequency measurements on the a(1), a(10), and a(15) hyperfine components of the R(78) 4-6 line of (127)I(2). An external-cavity diode laser system at 671 nm is frequency-stabilized to the saturated absorption center obtained by modulation transfer spectroscopy in an iodine vapor cell. Its absolute frequency is measured by an optical frequency comb. The effect of pressure shift is investigated to obtain the absolute transition frequency at zero pressure. Our determination of the line centers reaches a precision of better than 40 kHz and will provide useful input for theoretical calculations. This frequency-stabilized laser can be used as a reference laser for the spectroscopy of lithium D lines.
authors: Department of Physics and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu, Taiwan.
authors: Yao-Chin
authors: YC
authors: Huang
authors: Hsuan-Chen
authors: HC
authors: Chen
authors: Shih-En
authors: SE
authors: Chen
authors: Jow-Tsong
authors: JT
authors: Shy
authors: Li-Bang
authors: LB
authors: Wang