title: Narrow-linewidth light source for a coherent Raman transfer of ultracold molecules.
abstract: We describe a tunable two-color CW light source sufficient for realizing a coherent Raman transfer between two molecular states that are more than 0.5 eV (120 THz) apart. The simultaneous frequency stabilization of 901 nm and 655 nm light was achieved by locking diode lasers to a single ultralow expansion cavity with dual wavelengths coating. By utilizing offset-locking and optical phase-locked loop (OPLL), we ensured a large mode-hop free tuning range (> 2 GHz). The obtained short term linewidth (<10 Hz) and the linear drift of frequency (65 mHz/s) were both sufficient to eliminate the influence of laser linewidths on the efficiency of coherent Raman transition.
authors.affiliation: 1Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. ka_cypridina@atomtrap.t.u-tokyo.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Aikawa
authors.forename: J
authors.initials: J
authors.lastname: Kobayashi
authors.forename: K
authors.initials: K
authors.lastname: Oasa
authors.forename: T
authors.initials: T
authors.lastname: Kishimoto
authors.forename: M
authors.initials: M
authors.lastname: Ueda
authors.forename: S
authors.initials: S
authors.lastname: Inouye