The continuous increase of the average laser power of ultrafast lasers is a challenge with respect to the thermal load of the processing optics. The power which is absorbed in an optical element leads to a temperature increase, temperature gradients, changing refractive index and shape, and finally causes distortions of the transmitted beam. In a first-order approximation this results in a change of the focal position, which may lead to an uncon-trolled change of the laser machining process. The present study reports on investigations on the focal shift induced in thin plano-convex lenses by a high-power ultra-short pulsed laser with an average laser power of up to 525 W. The focal shift was determined for lenses made of different materials (N-BK7, fused silica) and with different coatings (un-coated, broadband coating, specific wavelength coating).
%0 Journal Article
%1 Faas:18
%A Faas, Sebastian
%A Foerster, Daniel J.
%A Weber, Rudolf
%A Graf, Thomas
%D 2018
%I OSA
%J Opt. Express
%K effects focal myown opticssend:unibiblio peer shift thermal
%N 20
%P 26020--26029
%R 10.1364/OE.26.026020
%T Determination of the thermally induced focal shift of processing optics for ultrafast lasers with average powers of up to 525 W
%U http://www.opticsexpress.org/abstract.cfm?URI=oe-26-20-26020
%V 26
%X The continuous increase of the average laser power of ultrafast lasers is a challenge with respect to the thermal load of the processing optics. The power which is absorbed in an optical element leads to a temperature increase, temperature gradients, changing refractive index and shape, and finally causes distortions of the transmitted beam. In a first-order approximation this results in a change of the focal position, which may lead to an uncon-trolled change of the laser machining process. The present study reports on investigations on the focal shift induced in thin plano-convex lenses by a high-power ultra-short pulsed laser with an average laser power of up to 525 W. The focal shift was determined for lenses made of different materials (N-BK7, fused silica) and with different coatings (un-coated, broadband coating, specific wavelength coating).
@article{Faas:18,
abstract = {The continuous increase of the average laser power of ultrafast lasers is a challenge with respect to the thermal load of the processing optics. The power which is absorbed in an optical element leads to a temperature increase, temperature gradients, changing refractive index and shape, and finally causes distortions of the transmitted beam. In a first-order approximation this results in a change of the focal position, which may lead to an uncon-trolled change of the laser machining process. The present study reports on investigations on the focal shift induced in thin plano-convex lenses by a high-power ultra-short pulsed laser with an average laser power of up to 525 W. The focal shift was determined for lenses made of different materials (N-BK7, fused silica) and with different coatings (un-coated, broadband coating, specific wavelength coating).},
added-at = {2018-09-23T19:57:26.000+0200},
author = {Faas, Sebastian and Foerster, Daniel J. and Weber, Rudolf and Graf, Thomas},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/287fc8bd069b5a3be0c8028c2236a69fa/sebastianfaas},
doi = {10.1364/OE.26.026020},
interhash = {9d3f667ca9e742f0fd05f0c4d5d1fe97},
intrahash = {87fc8bd069b5a3be0c8028c2236a69fa},
journal = {Opt. Express},
keywords = {effects focal myown opticssend:unibiblio peer shift thermal},
month = oct,
number = 20,
pages = {26020--26029},
publisher = {OSA},
timestamp = {2018-09-23T17:57:26.000+0200},
title = {Determination of the thermally induced focal shift of processing optics for ultrafast lasers with average powers of up to 525 W},
url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-26-20-26020},
volume = 26,
year = 2018
}
