Laser Beam Expander Lens

The laser beam emitted from the laser has a certain divergence angle.

Laser beam expander lens.

The fixed magnification sliding lens beam expanders are offered with optics that have either narrowband or wideband ar coatings. Galilean beam expander designs. Often a beam expander needs to fit within a constrained area limiting both the overall diameter and length of the system. Beam expanders consist of two lenses that are built according to the galileo principle and therefore do not generate an intermediate focus.

Designing a beam expander from off the shelf lenses can drastically reduce lead time and speed the design cycle. By utilizing zemax s lens catalog stock lenses can be easily selected and spacing can be adjusted for your design criteria. Beam expanders have two main purposes in the laser industry. The beam expander can change the diameter of laser and lens assembly of divergence angle.

Our fixed magnification rotating lens optical beam expander. For more information on our extensive line of beam expanders please see the beam expanders tab. Be sure to check the material when deciding if a lens is a good candidate to use for your beam expander. Laser beam diameters over 0 8 mm will produce diffraction rings in the focused spot due to aperturing at the output lens.

For example n sf11 and n bk7 can create an achromatic solution for a small range of wavelengths. For the laser processing only by adjusting the beam expander the laser beam can be changed into collimated parallel beam and the fine resolution high density facula can be. Beam wander is critical in any zoom lens so we employ a proprietary rail design which allows for minimal beam wander while maintaining diffraction limited performance over the entire expansion range. Beam guidance over long distances.

For laser beams smaller than 0 8 mm diameter the spot size will increase proportionally. Fixed magnification beam expanders are also available including achromatic and high power versions where the collimation can be fine tuned using a sliding lens adjustment mechanism and reflective beam expanders that use mirrors to expand the beam. There are variable beam expanders zoom expanders i e devices where the magnification can be adjusted in a certain range e g. From 2 to 5 or from 5 to 10 those contain at least three lenses and some fine mechanics to adjust the position of at least one of them.

Increased power density in the focal point. Custom designs have been built which produced wander of less than.