title: Efficient green-light generation by frequency doubling of a picosecond all-fiber ytterbium-doped fiber amplifier in PPKTP waveguide inscribed by femtosecond laser direct writing.
abstract: We have demonstrated an ultrashort, compact green light radiation by frequency doubling of an all-fiber ytterbium-doped fiber laser source in a PPKTP waveguide fabricated by femtosecond laser pulses. Using the fabricated PPKTP waveguide crystal containing a 10 mm single grating with a period of 9.0 μm, we generate 310 mW of picosecond radiation at 532 nm for a fundamental power of 1.6W, corresponding to a conversion efficiency of 19.3%. The temperature tuning range of 8°C is achieved for a fixed fundamental wavelength of 1064 nm, the FWHM of the wavelength tuning curve is 4.2 nm at room temperature. The generated ultrashort pulses at 532 nm are of great importance and have comprehensive applications in photobiology research and high-resolution spectroscopy.
authors.affiliation: School of Physics, Nankai University, Tianjin 300071, China.
authors.forename: Chenghou
authors.initials: C
authors.lastname: Tu
authors.forename: Zhangchao
authors.initials: Z
authors.lastname: Huang
authors.forename: Kai
authors.initials: K
authors.lastname: Lou
authors.forename: Hongjun
authors.initials: H
authors.lastname: Liu
authors.forename: Yishan
authors.initials: Y
authors.lastname: Wang
authors.forename: Yongnan
authors.initials: Y
authors.lastname: Li
authors.forename: Fuyun
authors.initials: F
authors.lastname: Lu
authors.forename: Hui-Tian
authors.initials: HT
authors.lastname: Wang