New schemes in the adjustment of bendable elliptical mirrors using a long trace profiler

Seung Yu Rah; Scott C. Locklin; Steven C. Irick; Malcolm R. Howells

doi:10.1117/12.295552

1 November 1997 New schemes in the adjustment of bendable elliptical mirrors using a long trace profiler

Seung Yu Rah, Scott C. Locklin, Steven C. Irick, Malcolm R. Howells

Proceedings Volume 3152, Materials, Manufacturing, and Measurement for Synchrotron Radiation Mirrors; (1997) https://doi.org/10.1117/12.295552
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

The Long Trace Profiler, an instrument for measuring the slope profile of long X-ray mirrors, has been used for adjusting bendable mirrors. Often an elliptical profile is desired for the mirror surface, since many synchrotron applications involve imaging a point source to a point image. Several techniques have been used in the past for adjusting the profile measured in height or slope of a bendable mirror. Underwood et al. have used collimated X- rays for achieving a desired surface shape for bent glass optics. Nonlinear curve fitting sing the simplex algorithm was later used to determine the best fit ellipse to the surface under test. A more recent method uses a combination of least squares polynomial fitting to the measured slope function in order to enable rapid adjustment to the desired shape. The mirror has mechanical adjustments corresponding to the first and second order terms of the desired slope polynomial, which correspond to defocus and coma, respectively. The higher order terms are realized by shaping the width of the mirror to produce the optimal elliptical surface when bent. The difference between desired and measured surface slope profiles allows us to make methodical adjustments to the bendable mirror based on changes in the signs and magnitudes of the polynomial coefficients. This technique gives rapid convergence to the desired shape of the measured surface, even when we have no information about the bender, other than the desired shape of the optical surface. Nonlinear curve fitting can be used at the end of the process for fine adjustments, and to determine the over all best fit parameters of the surface. This technique cold be generalized to other shapes such as toroids.

Citation Download Citation

Seung Yu Rah, Scott C. Locklin, Steven C. Irick, and Malcolm R. Howells "New schemes in the adjustment of bendable elliptical mirrors using a long trace profiler", Proc. SPIE 3152, Materials, Manufacturing, and Measurement for Synchrotron Radiation Mirrors, (1 November 1997); https://doi.org/10.1117/12.295552

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