A gradient-thickness Fresnel lens was photoimprinted in the germanium-doped core layer of a single-mode planar waveguide on silica by exposure to ultraviolet light through a mask, which increases the refractive index in the lens region by ≈5 × 10−3. The lens is used to collimate the output of a standard single-mode optical fiber butt coupled to the waveguide at a wavelength of 1.3 μm. The method is applicable to the mass production of complex diffractive elements in a planar waveguide geometry.
© 1995 Optical Society of America
Original Manuscript: December 16, 1994
Published: May 15, 1995
J. Albert, J. Huttunen, and J. Saarinen, "Planar Fresnel lens photoimprinted in a germanium-doped silica optical waveguide," Opt. Lett. 20, 1136-1138 (1995)