title: Intracavity second-harmonic generation at 320 nm of an actively Q-switched Pr:LiYF4 laser.
abstract: We demonstrate pulse laser operation of a Pr:LiYF(4) laser pumped by InGaN laser diodes (444 nm) using an acousto-optic modulator. We obtained a maximum laser peak power of 167 W (4 μJ/pulse) with a pulse width of 24 ns at an 11 kHz repetition rate for a 63 nm wavelength. Employing an 8 mm long lithium triborate nonlinear crystal in the laser cavity, we obtained a maximum peak power of 55 W (2.7 μJ/pulse) at 320 nm, which corresponds to a conversion efficiency of 69% with respect to the fundamental laser energy. The UV laser pulse width was 36 ns.
authors.affiliation: Department of Electronics and Electrical Engineering, Keio University, 3-14-1, Hiyoshi, Yokohama 223-8522, Japan.
authors.forename: Junichiro
authors.initials: J
authors.lastname: Kojou
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Watanabe
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Kojima
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nemoto
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Kannari
mesh_terms: D003116:Color; D005461:Fluorine / Q000737:chemistry; D054023:Lasers, Semiconductor; D053844:Lasers, Solid-State; D008094:Lithium / Q000737:chemistry; D011221:Praseodymium / Q000737:chemistry; D015019:Yttrium / Q000737:chemistry
chemical_list: D005461:Fluorine; D015019:Yttrium; D008094:Lithium; D011221:Praseodymium