Volumetric glass modification with Gaussian and doughnut-shaped pulses: From localized laser energy absorption to absorption delocalization

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00605687" target="_blank" >RIV/68378271:_____/24:00605687 - isvavai.cz</a>

Result on the web

<a href="https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12939/3012270/Volumetric-glass-modification-with-Gaussian-and-doughnut-shaped-pulses/10.1117/12.3012270.short" target="_blank" >https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12939/3012270/Volumetric-glass-modification-with-Gaussian-and-doughnut-shaped-pulses/10.1117/12.3012270.short</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1117/12.3012270" target="_blank" >10.1117/12.3012270</a>

Result language

angličtina

Original language name

Volumetric glass modification with Gaussian and doughnut-shaped pulses: From localized laser energy absorption to absorption delocalization

Original language description

Volumetric modification of glass materials by ultrashort laser pulses is a powerful technique enabling direct writing of three-dimensional structures for fabrication of optical, photonic, and microfluidic devices. The level of modification is determined by the locally absorbed energy density, which depends on numerous factors. In this work, the effect of the spatial pulse shape on the ultrashort laser excitation of fused silica was investigated experimentally and theoretically for the volumetric modification regimes. We focused on two shapes of laser pulses, Gaussian and doughnut-shaped (DS) ones. It was found that, at relatively low pulse energies, in the range of ~1–5 microjoules, the DS pulses are more efficient in volumetric structural changes than Gaussian pulses. It is explained by the intensity clamping effect for the Gaussian pulses, which leads to the delocalization of the laser energy absorption. In the DS case, this effect is overcome due to the geometry of the focused beam propagation, accompanied by the electron plasma formation, which scatters light toward the beam axis. The thermoelastoplastic modeling performed for the DS pulses revealed intriguing dynamics of the shock waves generated because of tubular-like energy absorption. It is anticipated that such a double shock wave structure can induce the formation of high-pressure polymorphs of transparent materials that can be used for investigations of nonequilibrium thermodynamics of warm dense matter. The DS laser pulses of low energies of the order of 100 nJ which generate a gentle tubular-like modification can be perspective for a miniature waveguide writing in glass.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

<a href="/en/project/EH22_008%2F0004596" target="_blank" >EH22_008/0004596: Sensors and Detectors for Future Information Society</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of SPIE

ISBN

978-151067184-3

ISSN

0277-786X

e-ISSN

—

Number of pages

7

Pages from-to

1293903

Publisher name

SPIE

Place of publication

Bellingham

Event location

Santa Fe

Event date

Feb 26, 2024

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

001260005400002