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研究了在不同偏振态干涉Ar~+激光作用下,一种偶氮无定形分子玻璃膜表面形成起伏光栅的特性。实验采用p+p,p+s,RCP+LCP三种干涉激光偏振态,利用实时光栅衍射效率测定和原子力显微镜观察等方法,考察了偶氮无定形分子玻璃(IAC-4)膜表面起伏光栅的形成速率和起伏深度。实验发现,当IAC-4形成表面起伏光栅时,其衍射效率增加速度和表面起伏光栅的深度为RCP+LCP>p+s>p+p。在RCP+LCP干涉激光照射下,IAC-4能够极快地形成表面起伏光栅;而用p+p干涉激光照射,则效率最低。在单束激光强度为58 mW/cm~2的RCP+LCP偏振态干涉激光照射下,经过80 s～2 min,一级衍射效率即可达62%并接近饱和,光栅起伏深度达到734 nm。而在同样强度的p+p,p+s偏振态干涉激光照射下,一级衍射效率和光栅起伏深度分别为3.1%,23 nm和9.3%,120 nm。采用p+s偏振干涉激光时,得到的光栅周期为干涉光场周期的一半。上述实验结果表明,偶氮无定形分子玻璃(IAC-4)材料可很好地用于表面起伏光栅制备,但刻写效果则取决于干涉激光的偏振态。
The properties of a kind of azo-amorphous molecular glass film on the surface of the azo-graphene were studied by using Ar + laser with different polarization states. The polarization states of three kinds of interfering laser beams, p + p, p + s and RCP + LCP, were investigated in this experiment. The diffraction efficiency of the graphene was measured by real-time grating diffraction and atomic force microscopy. The rate of formation and depth of relief. It is found experimentally that when IAC-4 forms a surface relief grating, the rate of increase of diffraction efficiency and the depth of the surface relief grating are RCP + LCP> p + s> p + p. With RCP + LCP interference laser irradiation, IAC-4 can form surface undulating grating very fast, while p + p interference laser irradiation has the lowest efficiency. Under the condition of single-beam laser intensity of 58 mW / cm ~ 2, the first-order diffraction efficiency can reach 62% and close to saturation after 80 s ~ 2 min irradiation, and the grating depth reaches 734 nm. The first-order diffraction efficiency and the grating depth were 3.1%, 23 nm and 9.3%, respectively, at the same intensity of p + p, p + s polarized interference laser. When p + s polarization interference laser is used, the grating period obtained is half of the period of the interference light field. The experimental results show that azo amorphous molecular glass (IAC-4) material can be used for surface relief grating preparation, but the writing effect depends on the polarization state of the interference laser.