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How are Beam Expander products designed
Posted on:
2022-04-15
The main function of conventional Beam Expander products is to use optical lenses to change the spatial shape distribution of the input light spot. For example, changing a small circular light spot into a large circular light spot, modulating a circular light spot into an elliptical light spot, changing the aspect ratio of a rectangular light spot, and so on. This issue introduces the design ideas of four Beam Expander products, and interested friends communicate more.
Option 1: Use two sets of positive lenses to expand the circular collimated light spot, and install pinholes at the common focus position of the two sets of lenses to block stray light.
Option 2: A combination of a positive and a negative lens is used to realize the beam expansion of the circular collimated light spot. Similar to the solution of the two groups of positive lenses, the configuration of the two groups of lenses, one positive and one negative, is still confocal.
Option 3: Use a cylindrical lens to shape the circular spot into an elliptical spot, and if the input spot wants to be compressed to an elliptical spot in a certain direction, you can use a cylinder lens. The input of circular collimated light spot keeps the collimation characteristics unchanged in the X direction, and compresses it in the Y direction to obtain an elliptical light spot. For the elliptical light spot after the laser is emitted, it can also be shaped into a circular light spot by using a cylindrical lens.
Option 4: Beam expansion design using prism combination, in addition to lens solution, prism solution can also be used for beam expansion design.
Since the laser is prone to interference, if the surface of the optical system is not coated, it will easily cause local energy concentration, and the local energy bullying difference caused by interference will reach 20%. Therefore, regardless of the safety of the energy threshold of the system, or Considering the accuracy of system detection, the optical system surface of Beam Expander products laser applications all need to be coated with transparent film.
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