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Proceedings Paper

Laser-written high-contrast waveguides in glass
Author(s): Alexander Streltsov; Nicholas Borrelli; James Dickinson; T. J. Kiczenski; Stephan Logunov; Joseph Schroeder
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Paper Abstract

Laser writing of waveguides in bulk glasses opens the opportunity for creating three-dimensional photonic devices. In order to become practical, the numerical aperture (NA) of these waveguides should be significantly higher than currently achievable of 0.1 - 0.15. One reason is that with higher NAs one can decrease the bending radii of the embedded photonic devices without significant loss penalty and make them compact. Thus, femtosecond-laser-written waveguides in glasses do not allow bending radii smaller than 15 - 20 mm. In order to overcome this limitation, we propose to fabricate waveguides in phase-separable and leachable glass where the index contrast is determined by the difference between the refractive indices of the unprocessed glass and of the leached porous glass. We show that we can achieve the NA = 0.25 prior to optimization. Surface and sub-surface treatment with a nanosecond ultraviolet (UV) laser produces a similar effect with even higher NA = 0.35. Applications may include a range of tightly packed embedded and three-dimensional photonic devices in bulk glass like directional couplers, splitters, interferometers, etc.

Paper Details

Date Published: 20 May 2009
PDF: 8 pages
Proc. SPIE 7366, Photonic Materials, Devices, and Applications III, 73661I (20 May 2009); doi: 10.1117/12.819789
Show Author Affiliations
Alexander Streltsov, Corning Inc. (United States)
Nicholas Borrelli, Corning Inc. (United States)
James Dickinson, Corning Inc. (United States)
T. J. Kiczenski, Corning Inc. (United States)
Stephan Logunov, Corning Inc. (United States)
Joseph Schroeder, Corning Inc. (United States)

Published in SPIE Proceedings Vol. 7366:
Photonic Materials, Devices, and Applications III
Ali Serpenguzel; Gonçal Badenes; Giancarlo C. Righini, Editor(s)

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