Photothermal study of optical components at 10.6 {mu}m: Finite element calculations and experiments

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:552042

Krupka, R; Giesen, A ^[1]

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1. Universitaet Stuttgart (Germany)

Up to now theoretical calculations of the photothermal response of optical components have only been performed using analytical approximations of the adequate thermo-mechanical equations. In contrast, this paper presents finite-element (FE) calculations for the description of the photothermal behaviour of optical components at 10.6 {mu}m. The FE-analysis allows the calculation of the surface temperature-and deformation-profile for bare substrates and two additional coating layers with respect to their thermo-optical properties. Also the behaviour of the interfaces (substrate - coating, coating layer1 - coating layer2) can be calculated. These FE-model calculations of the photothermal response were performed with respect to the thermal properties and absorption characteristics of the coating and substrate respectively. The results are compared to experimental results obtained using the photothermal deflection technique (PDT). Additionally, the FE-model used allows the calculation of the time resolved response of the optical component to pulsed irradiation. The calculations of the temporal behaviour are studied for a pulsed PDT situation and are compared to measurements. The results can also be used to determine the heat conductivity of the coatings of optical components. Some measurements and comparisons with the calculations are shown and discussed in detail.

• Research Organization: International Society for Optical Engineering, Washington, DC (United States)
• OSTI ID: 552042
• Report Number(s): CONF-9510106--Vol.2714
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
CARBON DIOXIDE LASERS
COATINGS
COMPUTERIZED SIMULATION
DEFORMATION
FINITE ELEMENT METHOD
LASER RADIATION
OPTICAL SYSTEMS
THERMAL CONDUCTIVITY