Norland Optical Adhesives probably has what you need.
Most of the adhesives they offer have an index of about 1.56.
They might have a special product that is a closer index match.
--
Mark Fuller
Microelectronics Fabrication Facility
Washington State University

Long Chen wrote:
> Hi, I am looking for some glue to attach a Sapphire piece to a high index lens
(>1.7).
> It would be great if the glue is transparent with refractive index close to
1.7~1.8.