Thorlabs offers the Optical-Grade Epoxy and Optically Clear Double-Sided Adhesive Tape. Thorlabs also carries standard epoxies and adhesives.
UV Curable Optical Assembly Adhesives
Optical Adhesives - Optical Adhesive
FiberSource - Precision Fiberoptic Connectivity Solutions
Adhesives for Optical Assembly - Tech Briefs
Adhesives for Precise Active Alignment in ADAS
Advanced Adhesive Solutions for Nano-Optical Applications
Optical Adhesives and Resins
Fiber Optic Glue Epoxy International
Optically Clear Adhesives - Henkel Adhesives
Thermo Fisher Scientific MicroAmp™ Optical Adhesive Film, pk/25 (Applied Biosystems SKU 4360954)
Dymax OP-4-20641 UV Optical Adhesive (3ml)
optical adhesives, explained by RP
Dymax OP-4-20632 UV Optical Adhesive (30ml)
Norland 81 UV (Ultraviolet) Adhesive (1 oz. bottle) – Fosco Connect