The use of wavelet in evaluating optics based on power spectral density character curve

In order to solve the problem that power spectral density function(PSD) is only an evaluation guideline to specify large aperture optical components' quality of laser system and can't provide effective guidance for eliminating certain frequency segment error,a wavelet method was used to analysis the optical surface errors.Firstly,PSD character curve was used to find the unqualified frequency range;secondly,two-dimensional continuous wavelet transform was used to find the corresponding region of this frequency segment,which can use as feedback to a machining process.The experiments' results show the use of wavelet can find the corresponding region of certain frequency segment effectively.