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Revealing extraordinary properties of femtosecond laser writing in glass

Revealing extraordinary properties of femtosecond laser writing in glass
Revealing extraordinary properties of femtosecond laser writing in glass
Modification of transparent materials with ultrafast lasers has attracted considerable interest due to a wide range of applications including laser surgery, integrated optics, optical data storage, 3D micro- and nano-structuring [1].Three different types of material modifications can be induced with ultrafast laser irradiation in the bulk of a transparent material, silica glass in particular: an isotropic refractive index change (type 1); a form birefringence associated with self-assembled nanogratings and negative refractive index change (type 2) [2,3]; and a void (type 3). In fused silica the transition from type 1 to type 2 and finally to type 3 modification is observed with an increase of fluence. Recently, a remarkable phenomenon in ultrafast laser processing of transparent materials has been reported manifesting itself as a change in material modification by reversing the writing direction [4]. The phenomenon has been interpreted in terms of anisotropic plasma heating by a tilted front of the ultrashort laser pulse. Moreover a change in structural modification has been demonstrated in glass by controlling the direction of pulse front tilt, achieving a calligraphic style of laser writing which is similar in appearance to that inked with the bygone quill pen [5]. It has also been a common belief that in a homogeneous medium, the photosensitivity and corresponding light-induced material modifications do not change on the reversal of light propagation direction. More recently it have observed that in a noncentrosymmetric medium, modification of the material can be different when light propagates in opposite directions (KaYaSo effect) [6]. Non-reciprocity is produced by magnetic field (Faraday effect) and movement of the medium with respect to the direction of light propagation: parallel (Sagnac effect) or perpendicular (KaYaSo effect). Moreover a new phenomenon of ultrafast light blade, representing itself the first evidence of anisotropic sensitivity of isotropic medium to femtosecond laser radiation has been recently discovered [7]. We attribute these new phenomena to the anisotropy of the light-matter interaction caused by space-time couplings in ultrashort light pulses. This intrinsic spatio-temporal asymmetry of light opens an interesting opportunity in the control of photon flux interacting with a target submerged into condensed isotropic medium. We anticipate that the observed phenomena will open new opportunities in laser material processing, laser surgery, optical manipulation and data storage.
Kazansky, P.G.
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Beresna, M.
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Shimotsuma, Y.
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Sakakura, M.
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Svirko, Y.
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Aktürk, S.
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Qiu, J.
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Miura, K.
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Hirao, K.
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Kazansky, P.G.
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Beresna, M.
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Shimotsuma, Y.
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Sakakura, M.
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Svirko, Y.
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Aktürk, S.
879e74c4-b274-4c51-80b1-5d8f9523805f
Qiu, J.
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Miura, K.
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Hirao, K.
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Kazansky, P.G., Beresna, M., Shimotsuma, Y., Sakakura, M., Svirko, Y., Aktürk, S., Qiu, J., Miura, K. and Hirao, K. (2010) Revealing extraordinary properties of femtosecond laser writing in glass. 17th International Symposium on Non-Oxide and New Optical Glasses (ISNOG 2010), China. 13 - 18 Jun 2010.

Record type: Conference or Workshop Item (Other)

Abstract

Modification of transparent materials with ultrafast lasers has attracted considerable interest due to a wide range of applications including laser surgery, integrated optics, optical data storage, 3D micro- and nano-structuring [1].Three different types of material modifications can be induced with ultrafast laser irradiation in the bulk of a transparent material, silica glass in particular: an isotropic refractive index change (type 1); a form birefringence associated with self-assembled nanogratings and negative refractive index change (type 2) [2,3]; and a void (type 3). In fused silica the transition from type 1 to type 2 and finally to type 3 modification is observed with an increase of fluence. Recently, a remarkable phenomenon in ultrafast laser processing of transparent materials has been reported manifesting itself as a change in material modification by reversing the writing direction [4]. The phenomenon has been interpreted in terms of anisotropic plasma heating by a tilted front of the ultrashort laser pulse. Moreover a change in structural modification has been demonstrated in glass by controlling the direction of pulse front tilt, achieving a calligraphic style of laser writing which is similar in appearance to that inked with the bygone quill pen [5]. It has also been a common belief that in a homogeneous medium, the photosensitivity and corresponding light-induced material modifications do not change on the reversal of light propagation direction. More recently it have observed that in a noncentrosymmetric medium, modification of the material can be different when light propagates in opposite directions (KaYaSo effect) [6]. Non-reciprocity is produced by magnetic field (Faraday effect) and movement of the medium with respect to the direction of light propagation: parallel (Sagnac effect) or perpendicular (KaYaSo effect). Moreover a new phenomenon of ultrafast light blade, representing itself the first evidence of anisotropic sensitivity of isotropic medium to femtosecond laser radiation has been recently discovered [7]. We attribute these new phenomena to the anisotropy of the light-matter interaction caused by space-time couplings in ultrashort light pulses. This intrinsic spatio-temporal asymmetry of light opens an interesting opportunity in the control of photon flux interacting with a target submerged into condensed isotropic medium. We anticipate that the observed phenomena will open new opportunities in laser material processing, laser surgery, optical manipulation and data storage.

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e-pub ahead of print date: 2010
Venue - Dates: 17th International Symposium on Non-Oxide and New Optical Glasses (ISNOG 2010), China, 2010-06-13 - 2010-06-18
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 340448
URI: http://eprints.soton.ac.uk/id/eprint/340448
PURE UUID: 02b9bb30-5b29-42b6-8f21-d9a1837e3d12

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Date deposited: 22 Jun 2012 08:05
Last modified: 06 Sep 2019 16:31

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Contributors

Author: P.G. Kazansky
Author: M. Beresna
Author: Y. Shimotsuma
Author: M. Sakakura
Author: Y. Svirko
Author: S. Aktürk
Author: J. Qiu
Author: K. Miura
Author: K. Hirao

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