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7 February 2006 Need to define a functional LIDT in multiple irradiation cases: examples of silica and KDP at 1064 nm and 355 nm
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Multiple laser irradiations induce a critical issue as regards the time of life of optical components. The problem can appear either in high repetition rate lasers or in high power systems even at low frequency. Two opposite behaviors are commonly observed under repetitive irradiations. A "fatigue effect" of materials under subsequent shots is generally observed and results in a decreasing of laser induced damage threshold (LIDT), but in some cases an improvement of LIDT can be noticed. This second effect linked to the pre-irradiation is well known as "conditioning" of the material. In most cases the LIDT in optical components is specified in 1:1, S:1 or R:1 modes, whatever the application of the real system. The aim of this paper is to show that the LIDT is strongly dependant on the parameters of irradiation such as shot number, shot frequency, wavelength and location in the material (surface or bulk). Therefore in order to approach a "true" value of LIDT it is necessary to test the component in the conditions of use, considering all the influential parameters. To illustrate this purpose the influence of previous parameters is studied for KDP and silica. This study shows that we can define a "functional laser damage threshold" in repetitive shot mode and also that the time of life could be deduced for each component. Furthermore these results can be useful to optimize the parameters involved in the conditioning processes.
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J.Y. Natoli, J. Capoulade, B. Bertussi, M. Commandre, and H. Piombini "Need to define a functional LIDT in multiple irradiation cases: examples of silica and KDP at 1064 nm and 355 nm", Proc. SPIE 5991, Laser-Induced Damage in Optical Materials: 2005, 599109 (7 February 2006);


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