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Due to the large divergence of the beam, it is recommended to use fast optics (f/1 . . . f/0.8) to collect most of the emitted light. We recommend the lens system from Cascade Technologies (see http://www.cascade-technologies.com), and aspheres from Janos (see http://www.janostech.com) or Optical solutions (see http://www.opticalsolutionsinc.com).