Fresnel Ripple Mapping Of Water-Cooled Laser Mirrors

Charles L. Budde

doi:10.1117/12.932331

30 December 1981 Fresnel Ripple Mapping Of Water-Cooled Laser Mirrors

Charles L. Budde

Proceedings Volume 0293, Wavefront Distortions in Power Optics; (1981) https://doi.org/10.1117/12.932331
Event: 25th Annual Technical Symposium, 1981, San Diego, United States

Abstract

It is well known that diffraction in an optical train will produce near-field Fresnel intensity ripples. A previous paper by Avizonis, O'Neil , and Hedin hypothesized that these Fresnel ripples would be mapped by typical water cooled laser mirrors producing surface distortions, which in turn would cause a drop in peak far-field intensity. This Fresnel ripple mapping phenomenon was studied by developing a detailed finite element model of a one inch by one inch segment of a water cooled laser mirror. The model was loaded with a uniform surface heat flux with various orientations of Fresnel intensity ripples superimposed upon it. A nonlinear steady-state heat transfer analysis was per-formed to determine the temperature distribution within the model. A thermal deformation analysis was then performed and the mirror surface distortion was computed. All analyses were performed using the NASTRAN finite element computer code. The results showed that the mirror indeed mapped the Fresnel intensity ripples. The mapping effect was shown to be insignificant for the particular cases analyzed, but projected results indicated that the Fresnel ripple mapping phenomenon could be significant for higher power and/or shorter wavelength laser systems.

Citation Download Citation

Charles L. Budde "Fresnel Ripple Mapping Of Water-Cooled Laser Mirrors", Proc. SPIE 0293, Wavefront Distortions in Power Optics, (30 December 1981); https://doi.org/10.1117/12.932331

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