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The influence of beam-cone-angle on the high energy laser induced damage of optical thin film

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Abstract

A continuous wave (cw) laser beam with extremely high power density is needed in the experimental study of the optical film’s thermal damage. In order to achieve such high power density, the incident beam generally needs to converge. In this situation, the cone-angle of the converged beam is inevitable, which may affect the damage process of the optical film. A thin-film Fabry–Perot filter is taken as an example. The influence of the beam cone angle on the thermal damage of the optical film is theoretically studied. Under the irradiation of high power cw laser, the film absorbs the laser energy and the heat accumulates continuously in the film. The cone-angle changes the laser intensity distribution, i.e. the heat source, in the multilayer film. The temperature distribution and the temperature rising process are also related to the cone-angle. Only when the cone’s half angle is smaller than 2°, the influence of the cone-angle may be ignored.

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Funding

Funding was provided by National High Technology Research and Development Program of China (Grant No. 2015AAXXX3037).

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Authors and Affiliations

  1. College of Opto-electronic Science and Engineering, National University of Defense Technology, Changsha, 410073, Hunan, China

    Han Kai

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  1. Han Kai
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Correspondence to Han Kai.

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Kai, H. The influence of beam-cone-angle on the high energy laser induced damage of optical thin film. J Opt 47, 278–282 (2018). https://doi.org/10.1007/s12596-018-0467-9

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  • DOI: https://doi.org/10.1007/s12596-018-0467-9

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