本文利用光电检测技术对光盘光栅的衍射特性进行研究.实现了对分光范围、衍射光强分布、衍射叠级、自由光谱范围、衍射角与衍射光波长的线性度、角分辨率和光栅常数等光栅参数的观测和计算.该实验结果与衍射理论结果一致.该方法在一定程度上弥补传统光栅实验的不足，有利于增进本科生对大学光学中衍射光栅的认识.

Diffraction characteristics of polycarbonate (PC)layers of recordable optical discs are investigated

by photoelectric detection technique. The results such as diffraction spectrum range，distribution of diffracted light intensity，spectral overlap，free spectral range，relationship between angles and wavelength，angular resolution and grating constant are analyzed，respectively. The experimental results are consistent with the diffraction theory. The method makes up the shortage of traditional grating experiments and it is helpful to improve undergraduates' recognitions on diffraction grating in the college optics.