Optical Design and Analysis of a Laser Expander for a Blu-ray Pickup Head for Synchronous Detection of the Tilt Angle and Displacement on the Test Plane

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/51047

Title:	Optical Design and Analysis of a Laser Expander for a Blu-ray Pickup Head for Synchronous Detection of the Tilt Angle and Displacement on the Test Plane
Authors:	Sun,WS;Lin,YN;Chang,JY
Contributors:	光電科學與工程學系
Keywords:	DISK PICKUP;OBJECTIVE LENS;COMPACT;PROFILOMETER;CANTILEVER
Date:	2011
Issue Date:	2012-03-27 18:16:40 (UTC+8)
Publisher:	國立中央大學
Abstract:	An optical design is developed for a Blu-ray pickup head with a laser expander that can synchronously detect the linear displacement and two-dimensional angular tilts at the test plane. To improve the signal accuracy of the photo detector, a laser expander is used to transform the shape of the laser beam from elliptical to circular. A quadrant detector as used to detect the relative relationship between the V(A), V(B), V(C), V(D) signals, can be used to measure the tilt angle and displacement at the test plane. Measurement detection and analysis is based on one normalized focus error signal (NFES) and two angular signals. The optical efficiency of the Blu-ray pickup head with laser expander is 59.29%. The optical efficiency of the currently used commercial pickup head is only 8.08%. Tolerance analysis is also considered in the performance requirements. (C) 2011 The Japan Society of Applied Physics
Relation:	JAPANESE JOURNAL OF APPLIED PHYSICS
Appears in Collections:	[Department of Optics and Photonics] journal & Dissertation

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