Single-shot surface ablation and transient reflectivity changes of optical glasses induced by 34 fs laser pulses

A. Andrásik, R. Flender, J. Budai, T. Szörényi, B. Hopp

Research output: Conference contribution

Abstract

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 Jcm-2 (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 ∼18 Jcm-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: The reflectivity increases monotonously with increasing pulse energy for all spot sizes, with decreasing absolute values/slopes with decreasing spot areas. Different reflectivities belong to the same fluence/intensity depending on the actual spot size, consequently the fluence/intensity alone does not define unambigously the characteristics of the plasma. The correct description of the changes in reflectivity requires the specification of the spot size together with the pulse energy/fluence/intensity.

Original languageEnglish
Title of host publicationShort-Pulse High-Energy Lasers and Ultrafast Optical Technologies
EditorsPavel Bakule, Constantin L. Haefner
PublisherSPIE
ISBN (Electronic)9781510627345
DOIs
Publication statusPublished - jan. 1 2019
EventShort-Pulse High-Energy Lasers and Ultrafast Optical Technologies 2019 - Prague, Czech Republic
Duration: ápr. 1 2019ápr. 3 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11034
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceShort-Pulse High-Energy Lasers and Ultrafast Optical Technologies 2019
CountryCzech Republic
CityPrague
Period4/1/194/3/19

Fingerprint

Optical glass
Ablation
Reflectivity
ablation
shot
Laser pulses
Laser
reflectance
fluence
glass
pulses
lasers
Energy
Absolute value
profilometers
energy
Comparative Study
specifications
Slope
Logarithmic

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Andrásik, A., Flender, R., Budai, J., Szörényi, T., & Hopp, B. (2019). Single-shot surface ablation and transient reflectivity changes of optical glasses induced by 34 fs laser pulses. In P. Bakule, & C. L. Haefner (Eds.), Short-Pulse High-Energy Lasers and Ultrafast Optical Technologies [110340T] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11034). SPIE. https://doi.org/10.1117/12.2523006

Single-shot surface ablation and transient reflectivity changes of optical glasses induced by 34 fs laser pulses. / Andrásik, A.; Flender, R.; Budai, J.; Szörényi, T.; Hopp, B.

Short-Pulse High-Energy Lasers and Ultrafast Optical Technologies. ed. / Pavel Bakule; Constantin L. Haefner. SPIE, 2019. 110340T (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11034).

Research output: Conference contribution

Andrásik, A, Flender, R, Budai, J, Szörényi, T & Hopp, B 2019, Single-shot surface ablation and transient reflectivity changes of optical glasses induced by 34 fs laser pulses. in P Bakule & CL Haefner (eds), Short-Pulse High-Energy Lasers and Ultrafast Optical Technologies., 110340T, Proceedings of SPIE - The International Society for Optical Engineering, vol. 11034, SPIE, Short-Pulse High-Energy Lasers and Ultrafast Optical Technologies 2019, Prague, Czech Republic, 4/1/19. https://doi.org/10.1117/12.2523006
Andrásik A, Flender R, Budai J, Szörényi T, Hopp B. Single-shot surface ablation and transient reflectivity changes of optical glasses induced by 34 fs laser pulses. In Bakule P, Haefner CL, editors, Short-Pulse High-Energy Lasers and Ultrafast Optical Technologies. SPIE. 2019. 110340T. (Proceedings of SPIE - The International Society for Optical Engineering). https://doi.org/10.1117/12.2523006
Andrásik, A. ; Flender, R. ; Budai, J. ; Szörényi, T. ; Hopp, B. / Single-shot surface ablation and transient reflectivity changes of optical glasses induced by 34 fs laser pulses. Short-Pulse High-Energy Lasers and Ultrafast Optical Technologies. editor / Pavel Bakule ; Constantin L. Haefner. SPIE, 2019. (Proceedings of SPIE - The International Society for Optical Engineering).
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abstract = "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{\circledR}, 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 Jcm-2 (1.89±0.16∗1014 Wcm-2) and 5.86±0.31 Jcm-2 (1.75±0.09∗1014 Wcm-2) for BOROFLOAT{\circledR}, 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 ∼18 Jcm-2. On the contrary, significant differences have been obtained in the time integrated transient reflectivities, with the highest absolute values measured for the BOROFLOAT{\circledR} glass. Strong spot size dependence has been revealed: The reflectivity increases monotonously with increasing pulse energy for all spot sizes, with decreasing absolute values/slopes with decreasing spot areas. Different reflectivities belong to the same fluence/intensity depending on the actual spot size, consequently the fluence/intensity alone does not define unambigously the characteristics of the plasma. The correct description of the changes in reflectivity requires the specification of the spot size together with the pulse energy/fluence/intensity.",
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