多阶母盘刻录系统中的激光多阶功率写入控制

Multi-Level Power Laser Writing Control Method for Multi-Level Mastering System

描述了多阶母盘刻录系统中一种基于工业标准结构(ISA)总线接口和复杂可编程逻辑器件(CPLD)技术的激光多功率写入控制方法及其控制电路的设计实现。控制电路以工业标准结构总线接口与计算机通信,以复杂可编程逻辑器件为核心处理单元,采用外加功率探测器进行功率反馈,可以同时控制激光器的写入功率和写入时间,使半导体激光器可以对母盘上感光材料进行多阶功率的曝光刻写,同时写入时间可调,从而实现母盘的多阶刻录。已经用于多阶母盘刻录实验系统,可以兼容不同类型的半导体激光器。实验结果表明,使用此控制电路可以在光致变色材料盘片上实现至少8阶功率写入,并获得8阶信号。其最小写入时间125ns,长时间工作输出功率的不稳定性小于1%,可满足只读型多阶光盘的刻录需要。

A multi-level power laser writing control method based on industry standard architecture (ISA) bus interface and complex programmable logic device (CPLD) technique for multi-level mastering system is described in this paper. And the control circuit has been designed. It communicates with computer with ISA interface, uses CPLD as processor, and controls the laser power by power feed back with photoelectric detector. It can control the writing power and writing time simultaneously, then the photo-sensitive material doped on the master disc can be exposed with several kinds of level power, at the same time, the writing time of the laser can be adjusted by pulse modulation, thus multi-level mastering is achieved. It has been applied in multi-level mastering system, which has a good compatibility to the different types of laser diodes. The experiment result shows that the control circuit can realize eight-level laser writing at least with the writing time adjusted (minimal 125 ns), and 8-level signal with higher stability (instability < 1%) is achieved in photochromism material disc.