Increasing diffraction efficiency by heating phase gratings formed by femtosecond laser irradiation in poly(methyl methacrylate)

被引：29

作者：

Hirono, Satoshi ^{[1
]}

Kasuya, Makoto ^{[1
]}

Matsuda, Katsumi ^{[1
]}

Ozeki, Yasuyuki ^{[2
]}

Itoh, Kazuyoshi ^{[2
]}

Mochizuki, Hiroyuki ^{[3
]}

Watanabe, Wataru ^{[3
]}

机构：

[1] OMRON Corp, Prod Engn Ctr, Monozukuri Innovat Headquarters, Shiga 5250035, Japan

[2] Osaka Univ, Grad Sch Engn, Dept Mat & Life Sci, Suita, Osaka 5650871, Japan

[3] Natl Inst Adv Ind Sci & Technol, Photon Res Inst, Osaka 5638577, Japan

来源：

APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 24期

关键词：

Bragg gratings; glass transition; heating; high-speed optical techniques; laser beam effects; optical polymers; refractive index; PULSE; POLYMETHYLMETHACRYLATE;

D O I：

10.1063/1.3155506

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The diffraction efficiency of phase gratings formed by femtosecond laser irradiation in poly(methyl methacrylate) was increased by more than an order of magnitude by subsequent heating below the glass transition temperature (T(g)). The first-order Bragg diffraction efficiency of a 10 mu m period grating was 1.9% without heating, whereas it increased to 72% when heated at 70 degrees C for 500 h. This is because the induced refractive index changes (Delta n) were increased by heating. From the Lorentz-Lorenz equation, one of the reasons why Delta n increases by heating could be a slight volume contraction in the irradiated area.

引用

页数：3

共 15 条

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