title: Note: folded optical system for narrow forward looking probe.
abstract: An optical system is described in which a laser beam makes three passes through a single graded index lens, forming a focus along the optic axis. It has important applications in endoscopic probes, where the forward looking characteristic permits the avoidance of obstacles and the narrow structure makes it minimally invasive.
authors.affiliation: Division of Electrical and Computer Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
authors.forename: Hsuan-Chao
authors.initials: HC
authors.lastname: Hou
authors.affiliation: Division of Electrical and Computer Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
authors.forename: Dooyoung
authors.initials: D
authors.lastname: Hah
authors.affiliation: Division of Electrical and Computer Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
authors.forename: Jeonghwan
authors.initials: J
authors.lastname: Kim
authors.affiliation: Division of Electrical and Computer Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
authors.forename: M
authors.initials: M
authors.lastname: Feldman
mesh_terms: D004867:Equipment Design; D055096:Optical Devices; D055100:Optical Fibers; D013499:Surface Properties