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

doi:10.1117/12.2523006

26 April 2019 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

Author Affiliations +

Proceedings Volume 11034, Short-pulse High-energy Lasers and Ultrafast Optical Technologies; 110340T (2019) https://doi.org/10.1117/12.2523006
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

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.

Citation Download Citation

A. Andrásik, R. Flender, J. Budai, T. Szörényi, and B. Hopp "Single-shot surface ablation and transient reflectivity changes of optical glasses induced by 34 fs laser pulses", Proc. SPIE 11034, Short-pulse High-energy Lasers and Ultrafast Optical Technologies, 110340T (26 April 2019); https://doi.org/10.1117/12.2523006

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Glasses

Reflectivity

Plasma

Laser ablation

Mirrors

Silica

Femtosecond phenomena

Show All Keywords

Keywords/Phrases

Search In:

Publication Years