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Increasing diffraction efficiency by heating phase gratings formed by femtosecond laser irradiation in poly(methyl methacrylate)
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10.1063/1.3155506
/content/aip/journal/apl/94/24/10.1063/1.3155506
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/24/10.1063/1.3155506
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Dependence of diffraction efficiency on heat treatment time at various temperatures.

Image of FIG. 2.
FIG. 2.

Analysis with Raman spectroscopy with or without heating after irradiation. The unheated sample (blue line) was kept at for 120 h, and the heated sample (red line) was kept at for 120 h after laser irradiation. (a) Irradiated area, (b) unirradiated area, and (c) spectrum obtained by subtracting that of unirradiated area in (b) from that of irradiated area in (a).

Image of FIG. 3.
FIG. 3.

Results of AFM analysis with different heating conditions after laser irradiation. (a) Sample before heating, (b) sample kept at for 120 h, and (c) sample kept at for 240 h. Arrows in panels (a)–(c) indicate laser irradiation directions. Graph (d) indicates sectional profile of the sections indicated by white lines in (a)–(c). The nonuniform height is considered to be due to material modification in the irradiated area of the sample, which was peeled off slightly during preparation to cut the sections.

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/content/aip/journal/apl/94/24/10.1063/1.3155506
2009-06-19
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Increasing diffraction efficiency by heating phase gratings formed by femtosecond laser irradiation in poly(methyl methacrylate)
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/24/10.1063/1.3155506
10.1063/1.3155506
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