title: Nd:YAG-pumped periodically poled LiNbO3 optical parametric generator seeded with the narrowband output of a 532-nm pumped optical parametric generator.
abstract: We present a simple scheme to generate a continuously tunable pulsed narrow-bandwidth infrared wave. An Nd:YAG-pumped periodically poled lithium niobate optical parametric generator (OPG) is seeded with the output of another OPG pumped by the second harmonic (0.532 microm) of the Nd:YAG laser. A tunable idler wave from the 0.532-microm pumped OPG, operated away from the degenerate point, provides a narrow linewidth seed source for the 1.064-microm pumped broadband OPG. Seeding forces the second OPG to operate in a narrowband operation comparable with that of the seed source. Linewidth of the YAG-pumped OPG is 5-25 nm, in the tuning range of 1.61-1.83 microm (signal), narrowed to 1.48-1.05 nm. Methods of further reduction of linewidth also have been discussed.
authors.affiliation: Research Institute of Electrical Communication, Tohoku University, Sendai, Japan. haidar@riec.tohoku.ac.jp
authors.forename: Sajjad
authors.initials: S
authors.lastname: Haidar
authors.forename: Takeshi
authors.initials: T
authors.lastname: Usami
authors.forename: Hiromasa
authors.initials: H
authors.lastname: Ito