Ultrafast laser-inscribed nanogratings in sapphire for geometric phase elements

Xu Shuai; Fan Hua; Li Zhen-Ze; Hua Jian-Guan; Yu Yan-Hao; Wang Lei; Chen Qi-Dai; Sun Hong-Bo

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Ultrafast laser-inscribed nanogratings in sapphire for geometric phase elements

机译：超快激光铭刻在蓝宝石中的纳米格拉特，用于几何相位元素

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We systematically studied femtosecond laser-inscribed. self-organized nanogratings and geometric phase elements such as a polarization diffraction focusing lens and Q-plate in sapphire crystal. Besides the void structures observed in the focus, nanogratings with periods of 150 similar to 300 nm were observed, depending on a nanoslit that took the role of a seeding effect by localized light field enhancement. The non-polarized refractive index change and birefringence were measured with values around 1 similar to 2 x 10(-3) and 6 x 10(-4), respectively. Based on the laser-inscribed form birefringence, a geometric phase lens and Q-plate were successfully demonstrated in sapphire with high imaging and a focusing effect. We expect that our findings may promote the understanding of laser-induced nanogratings in bulk and potential applications in geometric phase elements. (C) 2021 Optical Society of America

机译：我们系统地研究了飞秒激光。自组织纳米光栅和几何相位元件，如蓝宝石晶体中的偏振衍射聚焦透镜和Q板。除了在焦点中观察到的空洞结构外，还观察到周期为150至300 nm的纳米光栅，这取决于通过局部光场增强发挥种子效应的纳米线。测量的非偏振折射率变化和双折射值分别为1左右，类似于2x10（-3）和6x10（-4）。基于激光内切双折射，在蓝宝石上成功地实现了具有高成像和聚焦效果的几何相位透镜和Q板。我们希望我们的发现能促进对激光诱导的纳米光栅的理解，以及在几何相位元件中的潜在应用。（2021）美国光学学会

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来源
《Optics Letters》 |2021年第3期|共4页
作者
Xu Shuai; Fan Hua; Li Zhen-Ze; Hua Jian-Guan; Yu Yan-Hao; Wang Lei; Chen Qi-Dai; Sun Hong-Bo;
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作者单位

Jilin Univ Coll Elect Sci &

Engn State Key Lab Integrated Optoelect Changchun 130012 Peoples R China;

Tsinghua Univ Dept Precis Instrument State Key Lab Precis Measurement Technol &

Instru Beijing 100084 Peoples R China;

Jilin Univ Coll Elect Sci &

Engn State Key Lab Integrated Optoelect Changchun 130012 Peoples R China;

Jilin Univ Coll Elect Sci &

Engn State Key Lab Integrated Optoelect Changchun 130012 Peoples R China;

Jilin Univ Coll Elect Sci &

Engn State Key Lab Integrated Optoelect Changchun 130012 Peoples R China;

Jilin Univ Coll Elect Sci &

Engn State Key Lab Integrated Optoelect Changchun 130012 Peoples R China;

Jilin Univ Coll Elect Sci &

Engn State Key Lab Integrated Optoelect Changchun 130012 Peoples R China;

Tsinghua Univ Dept Precis Instrument State Key Lab Precis Measurement Technol &

Instru Beijing 100084 Peoples R China;

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正文语种 eng
中图分类计量学;光学;
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机译：钛：基于蓝宝石的超快泵浦探针激光源，紫外线和紫外线

Ultrafast laser-inscribed nanogratings in sapphire for geometric phase elements

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