自陷激子和缺陷在熔融石英中纳米光栅形成中的作用。

The role of self-trapped excitons and defects in the formation of nanogratings in fused silica.

机构信息

Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Jena, Germany. soeren.richter@uni‐jena.de

出版信息

Opt Lett. 2012 Feb 15;37(4):482-4. doi: 10.1364/OL.37.000482.

DOI:10.1364/OL.37.000482

PMID:22344080

Abstract

We investigate the role of self-trapped excitons (STEs) and defects in the formation of femtosecond laser pulse induced nanogratings (NGs) in fused silica. Our experiments reveal strongly enhanced NG formation for pulse separations up to the STE lifetime. In addition, the absorption spectra show that the weaker cumulative action of laser pulses for longer temporal separations is predominantly mediated by dangling-bond-type lattice defects that emerge from decaying STEs.

摘要

我们研究了自陷激子（STE）和缺陷在飞秒激光脉冲诱导的熔融石英纳米光栅（NG）形成中的作用。我们的实验表明，在 STE 寿命内，脉冲间隔的增加会强烈增强 NG 的形成。此外，吸收光谱表明，较长时间间隔下激光脉冲较弱的累积作用主要是由衰减 STE 产生的悬挂键型晶格缺陷介导的。