title: Tunable KTA Stokes laser based on stimulated polariton scattering and its intracavity frequency doubling.
abstract: This paper presents the tunable Stokes laser characteristics of KTiOAsO4(KTA) crystal based on stimulated polariton scattering (SPS). When the pumping laser wavelength is 1064.2 nm, the KTA Stokes wave can be discontinuously tuned from 1077.9 to 1088.4 nm with four gaps from 1079.0 to 1080.1 nm, from 1080.8 to 1082.8 nm, from 1083.6 to 1085.5 nm, and from 1085.8 to 1086.8 nm. When a frequency doubling crystal LiB3O5(LBO) is inserted into the Stokes laser cavity, the frequency-doubled wave can be discontinuously tuned from 539.0 to 539.5 nm, from 540.1 to 540.4 nm, from 541.3 to 541.8 nm, from 542.7 to 542.9 nm and from 543.4 to 544.2 nm. With a pumping pulse energy of 130.0 mJ and an output coupler reflectivity of about 30%, the obtained maximum Stokes laser pulse energy at 1078.6 nm is 33.9 mJ and the obtained maximum frequency-doubled laser pulse energy at 543.8 nm is 15.7 mJ. By using the most probably coupled transverse optical modes obtained from the literature, the polariton refractive indexes, and the simplified polariton Sellmeier equations, the polariton dispersion curve is obtained. The formation of the Stokes frequency gaps is explained.
authors.forename: Jie
authors.initials: J
authors.lastname: Zang
authors.forename: Zhenhua
authors.initials: Z
authors.lastname: Cong
authors.forename: Xiaohan
authors.initials: X
authors.lastname: Chen
authors.forename: Xingyu
authors.initials: X
authors.lastname: Zhang
authors.forename: Zengguang
authors.initials: Z
authors.lastname: Qin
authors.forename: Zhaojun
authors.initials: Z
authors.lastname: Liu
authors.forename: Jianren
authors.initials: J
authors.lastname: Lu
authors.forename: Dong
authors.initials: D
authors.lastname: Wu
authors.forename: Qiang
authors.initials: Q
authors.lastname: Fu
authors.forename: Shiqi
authors.initials: S
authors.lastname: Jiang
authors.forename: Shaojun
authors.initials: S
authors.lastname: Zhang