Frequency measurements and hyperfine structure of the R(85)33–0 transition of molecular iodine with a femtosecond optical comb

Abstract

Absolute frequency measurements of the R(85)33-0 transition of molecular iodine at the blue end of the tuning range of a frequency-doubled Nd:YAG laser are implemented with a femtosecond optical comb based on a mode-locked Ti:sapphire laser. The hyperfine structure of the R(85)33-0 transition is observed by use of high-resolution laser spectroscopy and is measured by the femtosecond optical comb. The observed hyperfine transitions are good frequency references for both frequency-doubled Nd:YAG and Nd:YVO 4 lasers in the 532-nm region. High-accuracy hyperfine constants are obtained by our fitting the measured hyperfine splittings to a four-term Hamiltonian, which includes the electric quadrupole, spin-rotation, tensor spin-spin, and scalar spin-spin interactions.

Improved Frequency Measurement of a One-Dimensional Optical Lattice Clock with a Spin-Polarized Fermionic87Sr Isotope

“…28), 35) In this experimental configuration, since the laser light after the AOM was a pulsed-light used for the Sr spectroscopy, its frequency could not be directly measured with the frequency comb. The frequency relations in the frequency measurement are shown in Fig.…”

Present status of the development of an Yb optical lattice clock at NMIJ/AIST (National Metrology Institute of Japan / National Institute of Advanced Industrial Science and Technology)

“…To evaluate the linewidth of the fiber laser, we have observed the beat signal between the fiber laser (1112 nm) and one component of our optical frequency comb based on a femtosecond Ti:sapphire laser [16]. The observed beat signal is shown in the lower panel of Fig.…”

Comparison of 10 cm and 50 cm Long Iodine Cells in Iodine-Stabilized Diode Laser-Pumped Nd:YAG Laser at 532 nm

“…Recently, diode laser-pumped Nd:YAG lasers have been recognized as promising sources for high-resolution spectroscopy due to the high output intensity, narrow line-width and high absorption of green light in iodine. Hyperfine structures of the iodine transitions at 532 nm have been widely studied by many researchers (Arie and Byer, 1994;Eickhoff and Hall, 1995;Hong et al, 1998;Hong and Ishikawa, 2000;Rovera et al, 2002;Hong et al, 2003;2004).…”