An algorithm was developed to calculate the optimal combination of optical fiber and gradient-index lens variables that produces a range of desired spot sizes for laser beam delivery in photocoagulation. This algorithm was used to calculate the optical parameters of endophotocoagulating probes for argon green (514.5 nm) and krypton red (647.1 nm) lasers used in ophthalmology. Prototype endoprobes have been built and tested during intraocular surgery on animals.
Michail M. Pankratov,
"Algorithm For Calculating A Variable-Magnification Endophotocoagulation Probe", Proc. SPIE 0713, Optical Fibers in Medicine II, (1 April 1987); doi: 10.1117/12.937363; https://doi.org/10.1117/12.937363