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Open AccessArticle

Laser-Inscribed Stress-Induced Birefringence of Sapphire

State Key Laboratory of Integrated Optoeletronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8550, Japan
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
Centre for Micro-Photonics, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
Melbourne Centre for Nanofabrication, ANFF, 151 Wellington Road, Clayton, VIC 3168, Australia
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(10), 1414;
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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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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