title: Optical vortex pumped mid-infrared optical parametric oscillator.
abstract: The first demonstration of a mid-infrared optical parametric oscillator pumped by 1-μm optical vortex pulses is presented. A 0.5-mJ 2-μm fractional vortex pulse having half-integer topological charge is generated. Using this system, 0.24-mJ vortex pulses with a topological charge of 1 can be created. The topological charges of the mid-infrared vortex pulses are observed by an interferometric technique in combination with second-harmonic frequency conversion.
authors.affiliation: Graduate School of Advanced Integration Science, Chiba University,1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. k-miyamoto@faculty.chiba-u.jp
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Miyamoto
authors.forename: Sachio
authors.initials: S
authors.lastname: Miyagi
authors.forename: Masaki
authors.initials: M
authors.lastname: Yamada
authors.forename: Kenji
authors.initials: K
authors.lastname: Furuki
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Aoki
authors.forename: Masahito
authors.initials: M
authors.lastname: Okida
authors.forename: Takashige
authors.initials: T
authors.lastname: Omatsu
mesh_terms: D004867:Equipment Design; D007259:Infrared Rays; D007368:Interferometry / Q000295:instrumentation* / Q000379:methods*; D007834:Lasers