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Spatial and temporal temperature distribution of ultrashort pulse induced heat accumulation in glass

 
: Richter, Sören; Hashimoto, Fumiya; Zimmermann, Felix; Yasuyuki, Ozeki; Itoh, Kazuyoshi; Tünnermann, Andreas; Nolte, Stefan

:

Heisterkamp, A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XV : 8 - 10 February 2015, San Francisco, California, United States
Bellingham, WA: SPIE, 2015 (Proceedings of SPIE 9355)
ISBN: 978-1-62841-445-5
Paper 935515, 8 pp.
Conference "Frontiers in Ultrafast Optics - Biomedical, Scientific, and Industrial Applications" <15, 2015, San Francisco/Calif.>
English
Conference Paper
Fraunhofer IOF ()
femtosecond laser materials processing; laser induced temperature distribution; heat accumulation; borosilicate glass

Abstract
We report on the first direct measurements of the laser induced temperature distribution after the absorption of multiple ultrashort laser pulses at high repetition rates in borosilicate glass. To this end, we developed an in-situ micro Raman setup to determine the temperature dependent ratio between Stokes and Anti-Stokes scattering. The results indicate a critical influence of the pulse energy on the induced temperature.
In borosilicate glass, the maximal temperature directly after the excitation (pulse energy of 1100 nJ, repetition rate of 1 MHz, wavelength of 1044 nm, pulse duration of 600 fs, 2000 pulses per laser spot) is more than 5000 K and rapidly cools down within several hundreds of ns.

: http://publica.fraunhofer.de/documents/N-332246.html