采用可变多分隔模式的新型单光束检测方法  

Novel one-beam detection method with changeable multi division patterns

作　　者：Noriaki Nishi 诸葛琼 

出　　处：《记录媒体技术》2008年第1期46-50,共5页China Mediatech

摘　　要：一、引言BD(Blu-ray Disc)是目前主流的高密度蓝光光盘格式,它采用405nm的激光波长和0.85的数值孔径,实现了单层25GB的存储容量。BD家族包括ROM (只读)/R(可录)/RE(可重写)等格式,以及标准容量为50GB的单面双层BD光盘。对于可录系统中的循迹误差信号,传统的三光束差分推挽法(DPP:Differential Push-Pull)We developed a new one-beam detection method with changeable multi division patterns,pairing with tangential spot size detection(SSD)method for focusing error detection.The changeable multi division patterns are realized by, the active device,which consists of a non-polarizing HOE for tangential SSD method,liquid crystal(LC)active rotator and two different division patterns of layered polarizing blazed HOEs.The LC active rotator properly acts as the mode selector and an R/RE mode pattern for one-beam push-pull method and a ROM mode pattern for differential phase detection(DPD)method can be selected only changing the applied voltage.The newly developed system can derive one- beam push-pull signal,DPD signal,wobble signal and RF signal from the output only from five common photo detectors. Sufficient quality of these signals is experimentally confirmed.

关 键 词：单光束 循迹误差 光电探测器 存储容量 蓝光光盘 挽法 数值孔径 激光波长 PUSH 杂散光 

分 类 号：TQ597[化学工程—精细化工]