氮化铝中的光折变效应。

Photorefractive effect in undoped aluminum nitride.

机构信息

Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo 153-8505, Japan.

出版信息

Opt Lett. 2010 Jul 1;35(13):2136-8. doi: 10.1364/OL.35.002136.

DOI:10.1364/OL.35.002136

PMID:20596171

Abstract

We report our observation of the photorefractive effect in undoped aluminum nitride. We measured the coupling constant and the formation rate as a function of pump intensity at a wavelength of 405 nm in a two-wave mixing experiment. The photorefractive gain coefficient was 0.47 cm(-1) at I = 6.9 W/cm(2), and the actual saturated value was probably larger than this. The time constant was 59 ms at I = 1.0 W/cm(2). In addition to a refractive index grating, an absorption grating was also formed, which is attributed mainly to an ionized trap density modulation process.

摘要

我们报告了在未掺杂氮化铝中光折变效应的观测结果。我们在波长为 405nm 的双波混合实验中，测量了耦合常数和形成速率作为泵浦强度的函数。在 I=6.9W/cm(2)时，光折变增益系数为 0.47cm(-1)，实际饱和值可能大于此值。在 I=1.0W/cm(2)时，时间常数为 59ms。除了折射率光栅外，还形成了吸收光栅，这主要归因于电离陷阱密度调制过程。