34 fs-os lézerimpulzus által keltett egylövéses ablációs és tranziens reflexiós változások optikai üvegfelületeken

Andrásik, Attila: 34 fs-os lézerimpulzus által keltett egylövéses ablációs és tranziens reflexiós változások optikai üvegfelületeken. In: Móra Akadémia, (7). pp. 168-179. (2019)

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Abstract

The experimental work and results of a comparative study on single-shot surface ablation of commercial optical glasses together with the transient reflectivity enhancement during the process are reported. Three types of optical glasses: Schott’s BOROFLOAT®, BK7 and B270 are ablated by single pulses of 34 fs duration at 800 nm central wavelength of the TeWaTi laser systems at University of Szeged, varying systematically both the pulse energy and the beam diameter on the surface, while recording the reflected signal. The depth and diameter of the ablated holes are characterized ex-situ by a DEKTAK profilometer. Very similar ablation characteristics have been determined: Above the ablation thresholds at 5.84±0.21 Jcm-2 (1.72±0.06*1014 Wcm-2 ), 6.43±0.56 Jcm2 (1.89±0.16*1014 Wcm-2 ) and 5.86±0.31 Jcm-2 (1.75±0.09*1014 Wcm-2 ) for BOROFLOAT®, BK7 and B270, respectively, both the diameter and the depth of the holes produced show logarithmic increase as a function of pulse energy/fluence until saturating above ~5*1014 W/cm-2 . On the contrary, significant differences have been obtained in the time integrated transient reflectivities, with the highest absolute values measured for the BOROFLOAT® glass. Strong spot size dependence has been revealed, as the reflectivity increases monotonously with increasing pulse energy for all spot sizes, with decreasing slopes with decreasing spot areas. The correct description of the changes in reflectivity requires giving the spot sizes.

Item Type: Book Section
Other title: Single-shot surface ablation and transient reflectivity changes of optical glasses induced by 34 fs laser pulses
Heading title: Természet- és környezettudományok
Journal or Publication Title: Móra Akadémia
Date: 2019
Volume: 7
ISSN: 2064-809X
Page Range: pp. 168-179
Uncontrolled Keywords: Optikai üveg, Természettudomány
Additional Information: Bibliogr.: p. 177-178. és a lábjegyzetekben ; összefoglalás angol nyelven
Date Deposited: 2019. Nov. 13. 12:10
Last Modified: 2019. Nov. 13. 12:10
URI: http://acta.bibl.u-szeged.hu/id/eprint/62352

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