Propagation of femtosecond white-light continuum pulse in polymer latex powder investigated by optical Kerr gate and time-resolved diffuse reflectance spectroscopy

被引：14

作者：

Furube, A ^{[1
]}

Asahi, T ^{[1
]}

Masuhara, H ^{[1
]}

机构：

[1] Osaka Univ, Dept Appl Phys, Osaka 5650871, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 1999年 / 38卷 / 7A期

关键词：

diffuse reflectance spectroscopy; light propagation; PMMA latex powder; optical Kerr gate; transient absorption; pump-probe technique; Kubelka-Munk theory;

D O I：

10.1143/JJAP.38.4236

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Propagation of a femtosecond white-light continuum pulse (350 fs) in poly (methyl methacrylate) (PMMA) latex powders with particle diameters of 1, 5, 20, 60, and 100 mu m was investigated by means of an optical Kerr gate and time-resolved diffuse reflectance spectroscopy, which is a pump-probe technique for multiple light scattering materials. The temporal profile of a diffuse reflected light pulse from the powder and the temporal response of transient absorption of the powder doped with an organic molecule were measured. The Kubelka-Munk model was extended to address the propagation of a short light pulse, and its numerical simulations reproduced both experimental results quite well. It is suggested that in a dense scattering medium such as powder, an effect that light is confined or proceeds in a twisted manner is of importance. Fitting the experimental data with the diffusion theory was unsuccessful, which is also discussed.

引用

页码：4236 / 4243

页数：8

共 39 条

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