Birefringent Fresnel zone plates in silica fabricated by femtosecond laser machining

被引：147
|
作者：
Bricchi, E [1 ]
Mills, JD
Kazansky, PG
Klappauf, BG
Baumberg, JJ
机构：
[1] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England
[2] Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England
来源：
OPTICS LETTERS | 2002年 / 27卷 / 24期
关键词：
D O I：
10.1364/OL.27.002200
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We demonstrate maskless, single-step fabrication of strongly birefringent Fresnel zone plates by focusing of femtosecond laser pulses deep within silica substrates. The process allows us to produce alternate zone rings directly by inducing a local refractive-index modification of the order of n similar to 10(-2). The embedded zone plates shown in this Letter exhibit efficiencies that vary by as much as a factor of similar to6 for orthogonal polarizations. Focal lengths of primary and secondary foci are shown to compare well with theory. (C) 2002 Optical Society of America.
引用
收藏
页码：2200 / 2202
页数：3
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