"; _cf_contextpath=""; _cf_ajaxscriptsrc="/cfthorscripts/ajax"; _cf_jsonprefix='//'; _cf_websocket_port=8578; _cf_flash_policy_port=1244; _cf_clientid='7181578FE765F6536694019043745739';/* ]]> */
Products Home / Optical Elements / Optical Lenses / Spherical Singlet Lenses / Bi-Concave Spherical Lenses
Bi-Concave Spherical LensesThorlabs' N-BK7, N-SF11, UV-fused silica, calcium fluoride, and zinc selenide bi-concave lenses are popular for many applications. Bi-concave lenses have a negative focal length and are best used to diverge a converging beam. Bi-concave lenses can diverge a collimated beam to a virtual focus and are commonly used in Galilean-type beam expanders. For more information on these substrates, please visit our Optical Substrates page.