There are lot, depending on your requirements. Anyway you can try: ';zLh
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1, Refractive: an achromatic as positive + plano-convex as negative; K.*zqQKlI|
OR '^lrGO6
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2, Reflective: two parabolic mirrors; st'Y j
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Both of them affer nice spherical aberration performance. HwM:bY
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Reminder: compute the laser beam density, ensure you have enough strong optical coating. e Hd{'J<
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Good luck.