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Open AccessArticle

Laser-Inscribed Stress-Induced Birefringence of Sapphire

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State Key Laboratory of Integrated Optoeletronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
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School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8550, Japan
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Tokyo Tech World Research Hub Initiative (WRHI), School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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Centre for Micro-Photonics, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
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Melbourne Centre for Nanofabrication, ANFF, 151 Wellington Road, Clayton, VIC 3168, Australia
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State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
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Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(10), 1414; https://doi.org/10.3390/nano9101414
Received: 19 August 2019 / Revised: 21 September 2019 / Accepted: 26 September 2019 / Published: 3 October 2019
(This article belongs to the Special Issue Laser Printing of Nanophotonic Structures)
Birefringence of 3 × 10 3 is demonstrated inside cross-sectional regions of 100 μ m, inscribed by axially stretched Bessel-beam-like fs-laser pulses along the c-axis inside sapphire. A high birefringence and retardance of λ / 4 at mid-visible spectral range (green) can be achieved using stretched beams with axial extension of 30–40 μ m. Chosen conditions of laser-writing ensure that there are no formations of self-organized nano-gratings. This method can be adopted for creation of polarization optical elements and fabrication of spatially varying birefringent patterns for optical vortex generation. View Full-Text
Keywords: femtosecond laser; birefringence; stress; sapphire femtosecond laser; birefringence; stress; sapphire
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MDPI and ACS Style

Fan, H.; Ryu, M.; Honda, R.; Morikawa, J.; Li, Z.-Z.; Wang, L.; Maksimovic, J.; Juodkazis, S.; Chen, Q.-D.; Sun, H.-B. Laser-Inscribed Stress-Induced Birefringence of Sapphire. Nanomaterials 2019, 9, 1414.

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