NUV femtosecond laser inscription of volume Bragg gratings in poly(methyl)methacrylate with linear and circular polarizations
NUV femtosecond laser inscription of volume Bragg gratings in poly(methyl)methacrylate with linear and circular polarizations
复制标题
具有线偏振和圆偏振的聚甲基丙烯酸甲酯体布拉格光栅的 NUV 飞秒激光刻字
DOI：
10.1088/1054-660x/23/12/126004
复制
发表时间：
2013
期刊：
影响因子：
1.2
通讯作者：
G. Dearden
中科院分区：
文献类型：
--
作者：
L. Ye;W. Perrie;O. Allègre;Y. Jin;Z. Kuang;Patricia Jane Scully;E. Fearon;D. Eckford;S. Edwardson;G. Dearden
在聚甲基丙烯酸甲酯（PMMA）上刻制了尺寸为5mm × 5mm、厚度为1 ~ 7mm、间距为20 μm的大型、高效率、体积的Bragg光栅，其平行光束长度为180秒，波长为387nm，采用线偏振和圆偏振。线偏振（垂直于扫描方向）的折射率对比度最高，而圆偏振的折射率对比度最低。当光栅厚度为L时，所测得的一阶衍射效率与理论预期相符，在L = 4 mm附近达到了94%的最大值，这是在纯PMMA中观察到的最高衍射效率。研究了折射率对比变化的来源，发现这是由于偏振相关的非线性细丝，这是在纯聚合物中首次观察到的。
Large, high efficiency, volume Bragg gratings with dimensions of 5 mm × 5 mm and thickness between 1 and 7 mm with 20 μm pitch have been inscribed in poly(methyl)methacrylate (PMMA) with 180 fs, 387 nm parallel beams using both linear and circular polarizations. Linear polarization (perpendicular to the scan direction) produced the highest refractive index contrast, while circular polarization produced the lowest. The measured first-order diffraction efficiency with grating thickness L agrees well with theoretical expectations, and reached a maximum of 94% near L = 4 mm, the highest yet observed in pure PMMA. The source of the variation in refractive index contrast was investigated, and it was found to be due to the polarization-dependent nonlinear filamentation, the first such observation in a pure polymer.
影响因子：
8.6
作者：
Shimotsuma, Y;Kazansky, PG;Hirao, K
通讯作者：
Hirao, K