title: Single-mode direct-ultraviolet-written channel waveguide laser in neodymium-doped silica on silicon.
abstract: A waveguide laser with a neodymium-doped silica core is fabricated on a silicon substrate by a combination of flame hydrolysis deposition, solution doping, and direct UV writing. The neodymium-ion concentration is estimated to be approximately 8000 parts in 10(5). The propagation loss around 1.05 microns is < 0.8 dB/cm. Lasing in the range 1048-1056 nm and 1356 +/- 1 nm is observed. A slope efficiency of 33% for a high-reflectivity output coupler and a threshold of 4 mW of absorbed power for a 25% output coupler are measured for the 4F3/2-->4I11/2 transition.
authors.affiliation: Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK. dag@orc.soton.ac.uk
authors.forename: D A
authors.initials: DA
authors.lastname: Guilhot
authors.forename: G D
authors.initials: GD
authors.lastname: Emmerson
authors.forename: C B
authors.initials: CB
authors.lastname: Gawith
authors.forename: S P
authors.initials: SP
authors.lastname: Watts
authors.forename: D P
authors.initials: DP
authors.lastname: Shepherd
authors.forename: R B
authors.initials: RB
authors.lastname: Williams
authors.forename: P G
authors.initials: PG
authors.lastname: Smith