Working Paper Article Version 1 This version is not peer-reviewed

Laser-inscribed stress-induced birefringence of sapphire

Version 1 : Received: 22 August 2019 / Approved: 23 August 2019 / Online: 23 August 2019 (09:49:21 CEST)

A peer-reviewed article of this Preprint also exists.

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. 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.

Journal reference: Nanomaterials 2019, 9, 1414
DOI: 10.3390/nano9101414

Abstract

Birefringence of 3 × 10-3 is demonstrated inside cross-sectional regions of 100 µm, 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 utilizing stretched beams with an axial extension of 30-40 µm. Conditions of laser writing chosen ensure that there are no formations of self-organised nano-gratings. This method can be adopted for the creation of polarisation optical elements and fabrication of spatially varying birefringent patterns for optical vortex generation.

Subject Areas

femtosecond laser; birefringence; stress; sapphire

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