Laser beam expanders consist of transmissive configurations, with Galilean or Keplerian designs, and reflective configurations, which use a series of mirrors, similar to microscope designs.
Laser Optics Lab:Specifications for Selecting a Laser
When determining which laser to use for your application, consider the following specifications: wavelength, coherence length, beam divergence, and Rayleigh range.
Learn about total internal internal reflection in this kid-friendly explanation with helpful visuals presented by Rebecca Emerich, Educational Outreach Manager
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