title: Low threshold monocrystalline Nd:(Gd, Lu)2O3 channel waveguide laser.
abstract: We report the first waveguide laser based on a rare-earth-doped sesquioxide. A 2 microm thick lattice matched Nd(0.5%):(Gd, Lu)(2)O(3) film with a nearly atomically flat surface has been epitaxially grown on a Y(2)O(3) substrate, using pulsed laser deposition. The film has been structured with reactive ion etching and a rib channel waveguide laser has been realized. Laser radiation at 1075 nm and 1079 nm has been observed under 820-nm pumping. The laser possesses a threshold power of about 0.8 mW and a preliminary slope efficiency of 0.5% versus incident pump power. A maximum output power of 1.8 mW has been obtained for 370 mW incident pump power.
authors.affiliation: Universität Hamburg, Institut für Laser-Physik, Luruper Chaussee 149, 22761 Hamburg, Germany. akahn@physnet.uni-hamburg.de
authors.forename: Andreas
authors.initials: A
authors.lastname: Kahn
authors.forename: Sebastian
authors.initials: S
authors.lastname: Heinrich
authors.forename: Henning
authors.initials: H
authors.lastname: Kühn
authors.forename: Klaus
authors.initials: K
authors.lastname: Petermann
authors.forename: Jonathan D B
authors.initials: JD
authors.lastname: Bradley
authors.forename: Kerstin
authors.initials: K
authors.lastname: Wörhoff
authors.forename: Markus
authors.initials: M
authors.lastname: Pollnau
authors.forename: Günter
authors.initials: G
authors.lastname: Huber