Abstract
At a first glance the low absorptivity of metals in the infrared
(IR) makes the use of YAG and CO2 lasers in metal processing very
inefficient. However industrial inert gas cutting abilities
demonstrates that the absorptivity can reach significantly higher
levels during the high power laser interaction. An increase which
can not be explained by the increase in temperature only. The
interaction between laser light and metals is a major physical
phenomena in laser material processing. The Drude free electron
model or simplifications like the Hagen-Rubens relation has often
been used to model the processes.This paper discuss the need to
extend the Drude model taking into account interband transitions
and anormal skin effect in order to describe in increase in
absorptivity seen at high intensities. The absorption model will
be used in a cut front simulation and results are compared with
cutting abilities from the Danish industry.
Original language | English |
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Title of host publication | Investigation into the absorptivity change in Metals with increased laser Power |
Publication date | 1996 |
Publication status | Published - 1996 |
Event | XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference - Heriot-Watt University, Edinburgh, United Kingdom Duration: 25 Aug 1996 → 30 Aug 1996 |
Conference
Conference | XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference |
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Location | Heriot-Watt University |
Country/Territory | United Kingdom |
City | Edinburgh |
Period | 25/08/1996 → 30/08/1996 |