Focus Lenses

Laser focusing lens plays an important role in laser systems and is one of the important components of laser cutting machines and engraving machines. The change of laser optical path is achieved by the refraction of the lens. Its function is to focus and adjust the laser focus, focusing the beam emitted by the laser on a small point. The laser penetrates the focusing lens throughout the entire process and bears part of the energy brought by the laser beam. Therefore, a good focusing lens needs to have the ability to withstand high temperatures, which also greatly affects its service life. Meanwhile, its surface must be treated very smoothly. If the surface of the lens is uneven, it is easy to cause scattering and divergence of the laser beam. Changing the direction of some laser beams not only reduces the power and energy of the laser beam, but also causes damage to the lens itself. Moreover, the surface of the lens does not need to be easily contaminated with dust. Dust adhering to the surface of the lens can cause the laser to directly burn the dust, which can burn the lens over time. Dust removal is a very important part of lens maintenance. Another important characteristic of a focusing lens is its transmittance. In theory, the higher the transmittance, the better the lens, the better the focusing effect, and the more durable it is. The quality of a laser head largely depends on the quality of the lens, so it is important to pay attention to the performance of the lens when purchasing a laser head.

Lens parameters
Material JGS1: Imported fused quartz
Appearance tolerance:+0.0/0.1mm can be customized
Thickness tolerance:+-0.1mm
Surface finish: 20-10
Parallelism: ≤ 0.5
Effective aperture:>90
Inverted edge:<0.2X45°
Coating: broadband anti reflection film, anti laser film
Diameter tolerance: -0.10mm
Center thickness tolerance:+-0.1mm
Focal length tolerance:+-1%
Aperture: 1-5
Local aperture: 0.2-0.5

Selection skills of focusing lens for laser cutting machine
The appropriate focal length lens should be selected according to the needs of practical applications. The smaller the size of the focusing mirror, the smaller the focused spot, and the more concentrated the laser energy, but the materials that can be processed are relatively thin.

The laser focusing lens produced by Ruicheng Optoelectronics is made of imported quartz crystal material, which has excellent optical, thermal and mechanical properties. It is coated with a high damage threshold anti reflection film on both sides to reduce losses caused by reflection. All lenses are made of excellent substrates processed through slicing, polishing, grinding and other processes, with strong laser resistance and a transmittance of over 99.5%. The focusing lens specifications used in all laser equipment are complete.