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TIR based photothermal / photoacoustic deflection

Riede, Wolfgang and Allenspacher, Paul (2008) TIR based photothermal / photoacoustic deflection. In: Boulder Damage Symposium. SPIE. Boulder Damage Symposium, 2008-09-22, Boulder, CO, USA.

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We report on a new experimental technique for monitoring laser-induced shock waves and thermal waves above the sample surface called total internal reflection based photothermal / photoacoustic deflection (TIR based PAD/PTD deflection). It is based on the changes in transmissivity of a prism which is operated near the TIR condition for a HeNe laser beam. The HeNe laser beam is probing photoacoustic or photothermal waves originating from a sample surface due to interaction with a pulsed Nd:YAG laser beam. The method is compared with standard online detection techniques like scatter probe monitoring and plasma detection, and found to be a very sensitive and practical tool. It also showed its suitability for selectively monitoring several surfaces (e. g. front and rear surface) of optical components, and attributing the damage starting point. Therefore, the method might be used for monitoring of surface damage on laser crystals or valuable components.

Item URL in elib:https://elib.dlr.de/55927/
Document Type:Conference or Workshop Item (Poster)
Title:TIR based photothermal / photoacoustic deflection
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Date:22 September 2008
Journal or Publication Title:Boulder Damage Symposium
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:photothermal deflection, photoacoustic deflection, laser damage, total internal reflection.
Event Title:Boulder Damage Symposium
Event Location:Boulder, CO, USA
Event Type:international Conference
Event Dates:2008-09-22
HGF - Research field:Energy
HGF - Program:Aeronautics
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):E - Qualifizierung (old)
Location: Stuttgart
Institutes and Institutions:Institute of Technical Physics
Deposited By: Riede, Wolfgang
Deposited On:03 Nov 2008
Last Modified:27 Apr 2009 15:25

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