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报道一种通过转动样品来实现空间调制微分反射（ＤＲ）光谱技术，给出ＧａＡｓ／ＡｌＧａＡｓ多量子阱和应变ＩｎＧａＡｓ／ＧａＡｓ多量子阱在室温下的ＤＲ谱实验测量结果，并与光调制反射谱（ＰＲ）实验和理论计算结果相比较．实验证明ＤＲ谱的信号比ＰＲ谱更强，可达１０－２量级，两者一致并与理论计算结果符合得很好．ＤＲ谱是研究薄膜和微结构的有效方法
A DR technique was investigated by rotating a sample. The experimental results of DR spectra at room temperature for GaAs / AlGaAs multiple quantum wells and strained InGaAs / GaAs multiple quantum wells were reported. The results were compared with those of light modulated reflectance spectra (PR) experiments and theoretical calculations are compared. The experimental results show that the signal of DR spectrum is stronger than that of PR spectrum, reaching the order of 10-2, which agrees well with the theoretical calculation. DR spectroscopy is an effective method for studying thin films and microstructures