title: Laser expander design of highly efficient Blu-ray disc pickup head.
abstract: We present a collimator design with a horizontal beam expander for a Blu-ray Disc pickup head. The design transforms the shape of a laser diode beam from an elliptical into circular which achieves higher efficiency in the pickup head system. In this research, we suggest two ways to do the beam expander. One way is to use two cylindrical lenses, and the other is to use two prisms.
authors.affiliation: Department of Optics and Photonics, National Central University, 32001 Chung-Li, Taiwan, R.O.C. wssun@dop.ncu.edu.tw
authors.forename: Wen-Shing
authors.initials: WS
authors.lastname: Sun
authors.forename: Kun-Di
authors.initials: KD
authors.lastname: Liu
authors.forename: Jui-Wen
authors.initials: JW
authors.lastname: Pan
authors.forename: Chuen-Lin
authors.initials: CL
authors.lastname: Tien
authors.forename: Min-Sheng
authors.initials: MS
authors.lastname: Hsieh
mesh_terms: D016250:Compact Disks; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D007909:Lenses; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers