I-expander yohlobo lwe-beam expander evame kakhulu itholakala ku-telescope yaseGalilean evame ukuba nelensi yokufaka eyodwa engemihle kanye nelensi yokuphuma eyodwa ehle. Ilensi yokufaka iveza ukugxila kwe-beam ebonakalayo ekuphumeni. Ngezilinganiso zokunwebeka eziphansi, i-telescope yaseGalilean ivame ukusetshenziswa kakhulu ngenxa yobulula, usayizi wephakheji omncane kanye nezindleko eziphansi. I-expander ye-beam ivame ukusetshenziswa ukukhulisa ububanzi be-laser okufanele bugxilwe emuva ngobukhulu bendawo encane.
Ubude be-Wavelength bugxile ekuhlinzekeni ngemikhiqizo yokukhanya enembile kakhulu iminyaka engama-20