银表面光学二次谐波参数的研究

本文测量了几种玻璃-银膜界面反射二次谐波随入射光偏振角的变化,测量了超高真空中多晶银基底上冷凝银膜表面退火前后的反射二次谐波,以及超高真空中纯度为99.99%多晶银表面的反射二次谐波,计算了垂直和平行表面谐波电流参数a、b,得到对棱镜-银界面b=-0.97;α=2.1,多晶银表面α=-9,冷凝银膜退火前后α分别为7和-5.结果表明.α对表面状况极为敏感.

Study on the surface phenomenological parameter with optical SHG from silver

Quantitative measurements of reflected optical second harmonic generation (SHG) of 1.06 μm versus the angle of polarization of the incident light from the interface between opaque silver films and several glasses are presented. And we also measured the reflected SHG from the surface of vacuum cold-evaporated thick silver film on a polyorystalline silver substrate in ultra-high vacuum (UHV) chamber before and after annealing the specimen. For comparison, the reflected SHG from 99.99% finely polished polycrystalline silver surface was detected in UHV. We measured that the phenomenological parallel current parameter b is equal to -0.97 and the phenomenological normal current parameter a had a value of 2.1 for glass-silver interface and -9 for polyclystalline silver sample. And that a varied from 7 to -5 for the cold-evaporated silver film on a polycrystalline silver substrate with the sample annealed. The experimental result shows that the parameter a is sensitive to the surface of the silver film.