collimation boci blt 421

About collimation boci blt 421

The collimation lens in the BLT421 cutting head aligns and straightens the laser beam emitted from the optical fiber. Fiber lasers naturally produce a slightly diverging beam, and the collimation lens converts this beam into parallel rays so the focusing lens can concentrate the energy accurately onto the cutting point.

Typical Specifications

• Lens type: Collimating lens

• Diameter: 32 mm

• Focal length: F100 mm

• Material: Optical fused silica (or similar high-grade optical glass)

• Coating: Anti-reflective coating for 10301090 nm fiber laser wavelength

• Compatibility: Designed for BLT421 / BLT421S cutting heads.

Function in the Optical System

In a fiber laser cutting head, the optical path usually works like this:

1. Fiber output laser beam exits the fiber and starts diverging.

2. Collimation lens converts the diverging beam into a parallel beam.

3. Focusing lens concentrates the parallel beam into a small high-energy spot on the material.

4. Protective lens protects internal optics from dust, smoke, and metal spatter.