17 October 2003 Femtosecond laser interferometric processing of Nd:GGG planar optical waveguide
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Proceedings Volume 4977, Photon Processing in Microelectronics and Photonics II; (2003) https://doi.org/10.1117/12.479243
Event: High-Power Lasers and Applications, 2003, San Jose, CA, United States
Abstract
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%.
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Ken Oi, Minoru Obara, Tetsumi Sumiyoshi, "Femtosecond laser interferometric processing of Nd:GGG planar optical waveguide", Proc. SPIE 4977, Photon Processing in Microelectronics and Photonics II, (17 October 2003); doi: 10.1117/12.479243; https://doi.org/10.1117/12.479243
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