Effects of Laser Mirror Surface Flatness

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Effects of Laser Mirror Surface Flatness

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  • Author: Jay Small
Whether or not you need to do a full analysis of your laser system to see the impacts of mirror flatness on system performance is application-dependent, but the λ/10 flatness value widely used in industry has its basis in actual analysis and is a great place to start. For a given wavelength, flatness specifications of λ/10 or better, regardless of mirror size, have practically indistinguishable effects. However, if your application requires flatness values of λ/20, additional analysis beyond just the mirrors in your system is likely warranted. Also, if the minor cost benefit of loosening flatness specifications to λ/4 could be worth it for your application, it is probably best to test λ/4 optics before making the decision to move to this looser flatness specification in volume production.

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