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Applied Optics

Applied Optics


  • Vol. 37, Iss. 12 — Apr. 20, 1998
  • pp: 2278–2287

Design of a high-efficiency volume grating coupler for line focusing

Stephen M. Schultz, Elias N. Glytsis, and Thomas K. Gaylord  »View Author Affiliations

Applied Optics, Vol. 37, Issue 12, pp. 2278-2287 (1998)

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A volume grating for outcoupling and line focusing of waveguided infrared light is designed and optimized. A local grating vector approach is used in combination with the rigorous coupled-wave analysis. By design, this volume grating coupler is holographically constructed on top of a waveguide by the interference of two coherent 364-nm ultraviolet waves formed with two aberration-optimized cylindrical lenses. This focusing coupler exhibits preferential-order coupling (92.9%) into the cover as well as very low focal intensity side lobes. This is accomplished through a chirped, slanted-fringe volume grating with a designed spatial variation in the attenuation coefficient (describing the outcoupling of the guided mode) along the length of the grating. This is achieved by a specific variation in the grating slant angle along the grating length. By design, the 1000-μm-length coupler focuses an 850-nm infrared guided wave to a line with an intensity FWHM of 3.32 μm and a 90% power width of 5.53 μm at a focal distance of 4 mm directly above the grating. Its performance is compared with that of a corresponding electron-beam-written surface-relief coupler design.

© 1998 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.1950) Diffraction and gratings : Diffraction gratings
(050.1970) Diffraction and gratings : Diffractive optics
(090.7330) Holography : Volume gratings
(130.0130) Integrated optics : Integrated optics

Original Manuscript: August 8, 1997
Revised Manuscript: November 17, 1997
Published: April 20, 1998

Stephen M. Schultz, Elias N. Glytsis, and Thomas K. Gaylord, "Design of a high-efficiency volume grating coupler for line focusing," Appl. Opt. 37, 2278-2287 (1998)

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