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Non-paraxial polarization spatio-temporal coupling in ultrafast laser material processing

Non-paraxial polarization spatio-temporal coupling in ultrafast laser material processing
Non-paraxial polarization spatio-temporal coupling in ultrafast laser material processing
Two hundred years after Malus' discovery of optical anisotropy, the study of polarization driven optical effects is as active as ever, generating interest in new phenomena and potential applications. However, in ultrafast optics, the influence of polarization is frequently overlooked being considered as either detrimental or negligible. Here we demonstrate that spatio-temporal couplings, which are inherent for ultrafast laser systems with chirped-pulse amplification, accumulate in multi pulse irradiation and lead to a strongly anisotropic light-matter interaction. Our results identify angular dispersion in the focus as the origin for the polarization dependence in modification, yielding an increase in modification strength. With tight focusing (NA ≥ ~0.4), this non-paraxial effect leads to a manifestation of spatio-temporal couplings in photo-induced modification. We devise a practical way to control the polarization dependence and exploit it as a new degree of freedom in tailoring laser-induced modification in transparent material. A near-focus, non-paraxial field structure analysis of an optical beam provides insight on the origin of the polarization dependent modification. However, single pulse non-paraxial corrected calculations are not sufficient to explain the phenomena confirming the experimental observations and exemplifying the need for multi-pulse analysis.
1863-8880
Patel, Aabid
19aacdf5-c01e-4122-94b6-a29c10485952
Tikhonchuk, Vladmir
6751a388-de8e-4020-8d5b-7ae882a8f569
Zhang, Jingyu
de184393-56fd-4f4d-8019-ae76b3f14b54
Kazansky, Peter
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Patel, Aabid
19aacdf5-c01e-4122-94b6-a29c10485952
Tikhonchuk, Vladmir
6751a388-de8e-4020-8d5b-7ae882a8f569
Zhang, Jingyu
de184393-56fd-4f4d-8019-ae76b3f14b54
Kazansky, Peter
a5d123ec-8ea8-408c-8963-4a6d921fd76c

Patel, Aabid, Tikhonchuk, Vladmir, Zhang, Jingyu and Kazansky, Peter (2017) Non-paraxial polarization spatio-temporal coupling in ultrafast laser material processing. Laser & Photonics Reviews. (doi:10.1002/lpor.201600290).

Record type: Article

Abstract

Two hundred years after Malus' discovery of optical anisotropy, the study of polarization driven optical effects is as active as ever, generating interest in new phenomena and potential applications. However, in ultrafast optics, the influence of polarization is frequently overlooked being considered as either detrimental or negligible. Here we demonstrate that spatio-temporal couplings, which are inherent for ultrafast laser systems with chirped-pulse amplification, accumulate in multi pulse irradiation and lead to a strongly anisotropic light-matter interaction. Our results identify angular dispersion in the focus as the origin for the polarization dependence in modification, yielding an increase in modification strength. With tight focusing (NA ≥ ~0.4), this non-paraxial effect leads to a manifestation of spatio-temporal couplings in photo-induced modification. We devise a practical way to control the polarization dependence and exploit it as a new degree of freedom in tailoring laser-induced modification in transparent material. A near-focus, non-paraxial field structure analysis of an optical beam provides insight on the origin of the polarization dependent modification. However, single pulse non-paraxial corrected calculations are not sufficient to explain the phenomena confirming the experimental observations and exemplifying the need for multi-pulse analysis.

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Accepted/In Press date: 6 March 2017
e-pub ahead of print date: 24 March 2017
Published date: 28 March 2017
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 407585
URI: http://eprints.soton.ac.uk/id/eprint/407585
ISSN: 1863-8880
PURE UUID: b4114060-ad4a-45ab-a9d3-ffb76e05d5cd
ORCID for Aabid Patel: ORCID iD orcid.org/0000-0001-9902-5192

Catalogue record

Date deposited: 16 Apr 2017 16:58
Last modified: 07 Oct 2020 06:24

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