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摘要: 在直拉法生长的GGG和YAG单晶体中,从实验上首次获得了沿位错线观察的(viewed end-on)螺型位错的双折射像,确立了沿位错线观察和垂直于位错线观察(viewed from the side)的双折射像间的一一对应关系,以及与蚀斑间的一一对应关系,并基于石榴石晶体弹-光性质的各向异性,给出了沿位错线观察的螺型位错双折射像的成像规律,得到了理论与实验一致的结果。
Abstract: Birefringence images of screw dislocations in Gadolinium Gallium Garnet (GGG) and Yttrium Aluminum Garnet YAG) crystals are studied in detail. Birefringence images of screw dislocations viewed end-on were observed for the first tiane. The one-to-one correspondence between birefringence images of screw dislocations viewed end-on and that viewed from the side was demonstrated. The contour of equal intensity of birefringence image of screw dislocation viewed end-on in GGG and YAG crystals was derived by considering the photo-elastieal anisotropy of garnet, and the result yields good agreement Avith experimental observations.