TY - JOUR
AU1 - Irie, Mitsuru
AB - The laser unit that adopts a polarized hologram element and a front laser diode (LD) monitor of 10.4 mm (width)×4.8 mm (depth)×5.5 mm (height) for digital versatile disc pickup was developed. By optimizing the phase transfer function of the hologram element and the division ratio of six segments of the photodetector, suitable characteristics of sensing signals, which were used in the spot-size-detection (SSD) method for the focusing sensor and the differential-phase-detection (DPD) method for the tracking sensor, were confirmed experimentally. The front monitor method using the reflective hologram was developed for stable control of the laser beam. The developed laser unit achieved an optical efficiency of more than 90%, and a wavefront aberration of 0.014λ rms. This paper describes the optical design of the laser unit system that adopts the polarized hologram element (PHOE) and optical characteristics of the PHOE laser unit. 
TI - Optical Design of Laser Unit with Polarized Holographic Element for Digital Versatile Disc Pickup
JF - Japanese Journal of Applied Physics
DO - 10.1143/JJAP.42.461
DA - 2003-02-01
UR - https://www.deepdyve.com/lp/iop-publishing/optical-design-of-laser-unit-with-polarized-holographic-element-for-C0s5miKAqj
SP - 461
VL - 42
IS - 2R
DP - DeepDyve
ER -