Permanent uptapers have been produced in a UV-cured epoxy by a self-induced waveguide, created by exposure to cw 532-nm light. The photorefractive effect in this material produces high-quality, low-loss waveguides, which adiabatically taper to give spot sizes of as much as 50 μm diameter. The waveguides can be used at 1550 nm to form low-cost beam expanders with separations of a few millimeters.
© 1993 Optical Society of America
Original Manuscript: January 27, 1993
Published: July 1, 1993
S. J. Frisken, "Light-induced optical waveguide uptapers," Opt. Lett. 18, 1035-1037 (1993)