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Solid-State Excitation Laser for Laser-Ultrasonics

Schnars, U. and Platz, W. and Mahnke, P. and Fix, A. and Frede, M. and Neumann, J. and Peuser, P. (2010) Solid-State Excitation Laser for Laser-Ultrasonics. 2nd International Symposium on Laser-Ultrasonics, 5-8 Juli, 2010 , Talence, Frankreich.

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Abstract

The inspection speed of laser-ultrasonics compared with conventional ultrasonic testing is limited by the pulse repetition rate of the excitation laser. The maximum pulse repetition rate reported up to now for CO2-lasers, which are presently used for nearly all systems, is in the range of 400 Hz. In this paper a new approach based on a diode-pumped solid-state laser is discussed, which is currently being developed. This new excitation laser is designed for a repetition rate of 1 kHz and will operate at a mid-IR wavelength of 3.3 m. The higher repeti-tion rate enables a higher inspection speed, whereas the mid-IR wavelength anticipates a better coupling efficiency. The total power for pumping the laser crystals is transported via flexible optical fibres to the compact laser head, thus allowing operation on a robot arm. The laser head consists of a master oscillator feeding several lines of power amplifiers and in-cludes nonlinear optical wavelength conversion by an optical parametric process. It is char-acterized by a modular construction which provides optimal conditions for operation at high average power as well as for easy maintenance. These features will enable building reliable, long-lived, rugged, smart laser ultrasonic systems in future

Document Type:Conference or Workshop Item (Speech)
Title:Solid-State Excitation Laser for Laser-Ultrasonics
Authors:
AuthorsInstitution or Email of Authors
Schnars, U.Airbus, Bremen
Platz, W.EADS Innovation Works, München
Mahnke, P.DLR
Fix, A.DLR
Frede, M.Laser Zentrum Hannover, Hannover
Neumann, J.Laser Zentrum Hannover, Hannover
Peuser, P. EADS Innovation Works, München
Date:July 2010
Status:Accepted
Keywords:Mid-infrared laser, Optical parametric oscillator,High repetition rate , Laser ultrasonics
Event Title:2nd International Symposium on Laser-Ultrasonics
Event Location:Talence, Frankreich
Event Type:international Conference
Event Dates: 5-8 Juli, 2010
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignement
DLR - Research theme (Project):L -- no assignement
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Dr.rer.nat. Andreas Fix
Deposited On:02 Aug 2010 15:32
Last Modified:02 Aug 2010 15:32

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