Laser Beam Expander Diy

A beam expander can be used in reverse with the larger diameter lens as the input and the smaller diameter lens as the output in order to reduce the diameter of the input beam.

Laser beam expander diy.

Thorlabs 0 5x to 2x galilean variable beam expanders reducers allow the user to easily adjust the beam diameter without altering the alignment of the optical setup. Standa diffraction limited galilean type laser beam expanders offer variable magnification of 2x 12x other ranges also available with adjustable focus to correct laser beam divergence. We also assume the input beam is gaussian and that we are mounting the beam expander directly to the laser simplifying the angle of incidence to 0 degrees. In the keplerian model the focal lengths of.

Galilean beam expanders in which an objective lens with a negative focal length and an image lens with a positive focal length are separated by the sum of their focal lengths are simple lower cost designs that also avoid the internal focus of keplerian beam expanders figure 4 the lack of an internal focus makes galilean beam expanders better suited for high power laser applications than. In its simplest form the galilean type consists of a positive and a negative focal length lens whereas the keplerian type consists of two positive focal length lenses. Laser beam expanders are designed to decrease the laser s beam spot size at large distances. Keplerian beam expander the easiest beam expander to build is a keplerian telescope.

How to build a beam expander beam expansion or reduction is a common application requirement in most labs using lasers or light sources and optics. The beam expander contains a fixed lens at the front followed by two movable lenses. Beam expanders consist of transmissive configurations with galilean or keplerian designs and reflective configurations which use a series of mirrors simi. There are two main types of beam expanders.

The zoom is adjusted by turning the magnification.