title: Suppression of mid-infrared light absorption in undoped congruent lithium niobate crystals.
abstract: Absorption measurements on 5 mol. % MgO-doped and undoped congruent lithium niobate (LiNbO(3)) crystals revealed absorption bands in the wavelength range of 2500-2800 nm, caused by incorporated hydrogen ions. High-temperature annealing was applied to the congruent LiNbO(3) (CLN) crystals, which decreased the absorption significantly. Then the annealed CLN crystals were periodically poled. As an application of the low-loss annealed CLN crystal, the operation of a 1550 nm pumped singly resonant CW optical parametric oscillator, resonant around 2600 nm, using a periodically poled crystal was demonstrated.
authors.affiliation: E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. schwesyg@physik.uni-bonn.de
authors.forename: J R
authors.initials: JR
authors.lastname: Schwesyg
authors.forename: C R
authors.initials: CR
authors.lastname: Phillips
authors.forename: K
authors.initials: K
authors.lastname: Ioakeimidi
authors.forename: M C C
authors.initials: MC
authors.lastname: Kajiyama
authors.forename: M
authors.initials: M
authors.lastname: Falk
authors.forename: D H
authors.initials: DH
authors.lastname: Jundt
authors.forename: K
authors.initials: K
authors.lastname: Buse
authors.forename: M M
authors.initials: MM
authors.lastname: Fejer