Characterization of Lenslet Arrays for Astronomical Spectroscopy

Microlens arrays are now widely used in a variety of astronomical instruments that require high performance. This paper describes the applications of microlenses in astronomical spectroscopy and discusses the necessary performance requirements. A variety of optical tests, including high dynamic range point-spread function measurements and determination of encircled energy, were developed to characterize the performance of a variety of lenslet arrays. Results are presented that indicate the best types of lenslet array for use for astronomical spectroscopy.

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