title: Generation of 578-nm yellow light over 10 mW by second harmonic generation of an 1156-nm external-cavity diode laser.
abstract: 578-nm yellow light with an output power of more than 10 mW was obtained using a waveguide periodically-poled-lithium-niobate crystal as a nonlinear medium for second harmonic generation, which is the highest output power at this wavelength using second harmonic generation of a solid state laser source without an enhancement ring cavity, to our knowledge. To achieve this result we made a high power 1156-nm external-cavity diode laser with the maximum output power of more than 250 mW. This system is expected to be an excellent alternative to the system using the sum-frequency generation with the advantage of simplicity and cost-effectiveness, and will be used as a clock laser of the ytterbium optical lattice clock with robust and reliable operation.
authors.affiliation: Center for Time and Frequency, Korea Research Institute of Standards and Science, Yuseong-Gu, Daejeon, Korea.
authors.forename: Won-Kyu
authors.initials: WK
authors.lastname: Lee
authors.forename: Chang Yong
authors.initials: CY
authors.lastname: Park
authors.forename: Dai-Hyuk
authors.initials: DH
authors.lastname: Yu
authors.forename: Sang Eon
authors.initials: SE
authors.lastname: Park
authors.forename: Sang-Bum
authors.initials: SB
authors.lastname: Lee
authors.forename: Taeg Yong
authors.initials: TY
authors.lastname: Kwon