Surface relief type gratings for input laser coupling were fabricated on the PLD deposited 2 at.%Nd:GGG thin film optical waveguide by femtosecond laser interferometric processing. The morphology and coupling efficiency were experimentally evaluated. A clear periodic structure with a fringe period of approximately 800 nm and height of approximately 100 nm was obtained for a surface relief type grating induced on the target surface with a fluence of 0.92 Jcm^-2. The coupling efficiency of an 808 nm-centered laser diode pumping light into the 1.35 μm thick film was measured as a function of the incident angle. Three coupling peaks were observed at 57°, 65° and 77°, each being the coupling to the TE₀, TE₁ and TE₂ modes respectively. Each peak had a large FWHM and a maximum coupling efficiency was 3%.

Date Published: 17 October 2003
PDF: 5 pages
Proc. SPIE 4977, Photon Processing in Microelectronics and Photonics II, (17 October 2003); doi: 10.1117/12.479243

Published in SPIE Proceedings Vol. 4977:
Photon Processing in Microelectronics and Photonics II
Alberto Piqué; David B. Geohegan; Friedrich G. Bachmann; Koji Sugioka; Frank Träger; Jan J. Dubowski; Peter R. Herman; Willem Hoving; Kouichi Murakami; Kunihiko Washio; Jim Fieret, Editor(s)