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Polarization engineering with ultrafast laser writing in transparent media

Polarization engineering with ultrafast laser writing in transparent media
Polarization engineering with ultrafast laser writing in transparent media
In this thesis novel developments in the field of femtosecond laser material processing are reported. Thanks to the unique properties of light-matter interaction on ultrashort time scales, this direct writing technique allowed the observation of unique phenomena in transparent media and the engineering of novel polarization devices.

Using tightly focused femtosecond laser pulses’, high average power second harmonic light was generated in the air with two orders of magnitude higher normalised efficiency than reported by earlier studies. We also demonstrated optical vortex generation in the air as a result of spin-orbital momentum coupling in the frequency doubling process.

The ultrashort laser pulses were also explored as a tool for micro-bubble formation. Due to the high refractive index contrast at the interface of a bubble and the glass substrate we observed edge birefringence, which could be utilised for optical vortex generation or as a radial polarizer. The experimental observation was supported by a theoretical model.

Finally, a series of birefringent optical elements were developed based on self-assembled nanostructures induced by ultrashort laser pulses in fused silica. The process was discovered a decade ago and mostly was regarded as a scientific curiosity. However, we demonstrated that these nanostructures can be used as the building blocks for novel optical elements based on spatially varying birefringent properties.
Beresna, Martynas
a6dc062e-93c6-46a5-aeb3-8de332cdec7b
Beresna, Martynas
a6dc062e-93c6-46a5-aeb3-8de332cdec7b
Kazansky, Peter
a5d123ec-8ea8-408c-8963-4a6d921fd76c

Beresna, Martynas (2012) Polarization engineering with ultrafast laser writing in transparent media. University of Southampton, Faculty of Physical and Applied Sciences, Doctoral Thesis, 184pp.

Record type: Thesis (Doctoral)

Abstract

In this thesis novel developments in the field of femtosecond laser material processing are reported. Thanks to the unique properties of light-matter interaction on ultrashort time scales, this direct writing technique allowed the observation of unique phenomena in transparent media and the engineering of novel polarization devices.

Using tightly focused femtosecond laser pulses’, high average power second harmonic light was generated in the air with two orders of magnitude higher normalised efficiency than reported by earlier studies. We also demonstrated optical vortex generation in the air as a result of spin-orbital momentum coupling in the frequency doubling process.

The ultrashort laser pulses were also explored as a tool for micro-bubble formation. Due to the high refractive index contrast at the interface of a bubble and the glass substrate we observed edge birefringence, which could be utilised for optical vortex generation or as a radial polarizer. The experimental observation was supported by a theoretical model.

Finally, a series of birefringent optical elements were developed based on self-assembled nanostructures induced by ultrashort laser pulses in fused silica. The process was discovered a decade ago and mostly was regarded as a scientific curiosity. However, we demonstrated that these nanostructures can be used as the building blocks for novel optical elements based on spatially varying birefringent properties.

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Published date: August 2012
Organisations: University of Southampton, Optoelectronics Research Centre

Identifiers

Local EPrints ID: 349212
URI: https://eprints.soton.ac.uk/id/eprint/349212
PURE UUID: 8dbd7ad3-bc9b-4858-9409-c9904045c43f

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Date deposited: 07 Mar 2013 14:37
Last modified: 18 Sep 2017 16:33

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