These beam expanders use a low-aberration, achromatic design optimized to provide a wavefront error of less than λ/4 (i.e., diffraction-limited performance) and minimize the impact on the M² value of the expanded beam. Thorlabs' Achromatic AR-Coated Galilean Beam Expanders can expand or reduce the diameter of a collimated beam by a factor of 2, 3, 5, 10, 15 or 20. Threaded Apertures for Integration into Optical Systems.Can be Used to Reduce Beam Size by Using the Larger Aperture as the Input.Collimation Adjustment Ring can be Locked with Included Hex Key.Housing with Fixed Mechanical Length and Non-Rotating Ends.Sliding Lens Adjustment that Minimizes Beam Walk Off.3 Broadband AR Coating Wavelength Ranges.2X, 3X, 5X,10X, 15X, or 20X Beam Expansion or Reduction.Input (Back) and Output (Front) Apertures of the GBE02-B 2X Beam Expander Features
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