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Recent advances in femtosecond laser writing inside transparent materials

Recent advances in femtosecond laser writing inside transparent materials
Recent advances in femtosecond laser writing inside transparent materials
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 microand nano-structuring [1].T 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 non-centrosymmetric medium, modification of the material can be different when light propagates in opposite directions (KaYaSo effect) [6]. 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. 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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Qiu, J.
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Svirko, Y.P.
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Aktürk, S.
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Miura, K.
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Hirao, K.
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Corbari, C.
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Kazansky, P.G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Beresna, M.
a6dc062e-93c6-46a5-aeb3-8de332cdec7b
Shimotsuma, Y.
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Sakakura, M.
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Qiu, J.
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Svirko, Y.P.
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Aktürk, S.
879e74c4-b274-4c51-80b1-5d8f9523805f
Miura, K.
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Hirao, K.
fa81b51e-88a4-496f-bf00-1eca4fd5d7ca
Corbari, C.
273904e8-5f90-4110-bc17-3d3f2c27d461

Kazansky, P.G., Beresna, M., Shimotsuma, Y., Sakakura, M., Qiu, J., Svirko, Y.P., Aktürk, S., Miura, K., Hirao, K. and Corbari, C. (2010) Recent advances in femtosecond laser writing inside transparent materials. Advanced Laser Technologies (ALT 2010), Nijmegen, Netherlands. 12 - 16 Sep 2010. 1 pp .

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 microand nano-structuring [1].T 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 non-centrosymmetric medium, modification of the material can be different when light propagates in opposite directions (KaYaSo effect) [6]. 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. 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: September 2010
Venue - Dates: Advanced Laser Technologies (ALT 2010), Nijmegen, Netherlands, 2010-09-12 - 2010-09-16
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 340243
URI: http://eprints.soton.ac.uk/id/eprint/340243
PURE UUID: b326ba9a-eda0-4ea8-b867-43e1c2e26404

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Date deposited: 18 Jun 2012 13:03
Last modified: 01 Oct 2019 16:31

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