初始化条件对Ge_2Sb_2Te_5相变光盘反射率和载噪比的影响

Effect of Initialization Conditions on the Reflectivity and CNR of Ge_2Sb_2Te_5 Phase-change Optical Disk

Ge2 Sb2 Te5相变光盘的反射率对比度和载噪比受初始化条件影响很大。研究表明 ,反射率对比度在转速比较低时随功率增加而增大 ,而转速较高时随功率增加而减小 ;反射率对比度基本随转速增加而减小 ,不同波长处的反射率对比度相差比较大 ;载噪比随初始化功率和转速的增加都是先增大后减小 ;最佳初始化条件为 :功率为 110 0～ 130 0mW ,转速为 3 0～ 4 2m s。

The initialization conditions have great effect on the reflectivity contrast and CNR of Ge 2Sb 2Te 5 phase change optical disk. It is indicated that the reflectivity contrast increases at low velocity, while decreases at high velocity, as the initialization power increases and the reflectivity contrast decreases as the initialization velocity increases. Also the reflectivity contrast is very different when the measurement wavelength changes from 400 to 900 nm. The CNR of Ge 2Sb 2Te 5 phase change optical disk first increases and then decreases when the initialization power and velocity increase. The most favorable initialization conditions are those that power ranges from 1100 to 1300 mW and velocity ranges from 3.0 to 4 2 m/s.