Grin lens secured with epoxy.
Casix Hybrid secured with thermal epoxy.
Optical faces covered prior to glueing with a piece of CRT faceplate protector (waxed paper with a glue of similar strength to post-it notes) These are kind to coated surfaces and prevent you getting adhesive on the faces that matter.
This is the heart of the `laser pointer from hell` - there is a photo of it in action at the bottom of the main page. The pump diode is 1.5W, o/p power peaks at approx. 100mW.