There are lot, depending on your requirements. Anyway you can try: =cS&>MT
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1, Refractive: an achromatic as positive + plano-convex as negative; "w'pIUQ3,
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2, Reflective: two parabolic mirrors; [-])$~WfW
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Both of them affer nice spherical aberration performance. @MES.g
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Reminder: compute the laser beam density, ensure you have enough strong optical coating. gEd A
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