Where can I buy small (~500um to 1mm diameter) solid immersion lenses? Preferably made of GaP or some other high refractive index material?

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John Schaibley

AWI used to sell these in baggies of 10-20 made of cubic zirconia. They are sometimes called "half-ball" lenses.

http://www.awi-industries.com/index.html

Craig Brideau

If you are using monochromatic light a GRIN rod type lens might work, otherwise John's suggestion of half-ball lenses should do the job. Edmund Optics sells a selection of them made with high Index glass.