Glass Cutting Bessel objective with Variable Depth of Focus
Our Variable DOF Bessel objective is a Diffractive based optical module that to focuses a single mode Gaussian input beam into a tight spot with 2 um waist size and a variable depth of focus (DOF) ranging from 0.08-1.5 mm in air. The Variable DOF Bessel objective has a constant spot size over the entire adjustment range , optimal for systems that cut different thickness of glass and need to maintain the same cut quality.
The Variable DOF Bessel Objective is normally used in the near IR wavelength range (1030-1080nm) for laser glass cutting applications, and can be used to cut both thin and thick glass. We also offer a variant at green wavelengths (515-532nm) and can offer custom option for other wavelengths, as required .
Each Bessel Variable DOF e module is shipped out of our factory an individual testing report showing focusing performance at maximum and minimum DOF.
Variable DOF Bessel Objective unique characteristics:
- Flexible cutting – Adjustable DOF from ~80 um to 1500 um in Air (X1.5 in glass)
- Constant spot size of 2um over the entire range of DOF values
- Complete solution (Bessel generator and focus objective in one element)
- High LDT, Ultra Short Pulse compatible- all parts are fused Silica optics
- Diffractive Axicon generates perfect wavefront, no Bessel distortions and no dead area in Axicon apex
Bessel objective normalized intensity in focus for different adjustment positions from minimal DOF ( blue) to maximal (yellow)
Specifications of standard Variable DOF Bessel Objective :
* Depth of focus (DOF) in the processed material is equal to DOF in air multiplied by the refractive index of the material.
** All modules come with screw-on protective window that can be easily removed and cleaned as needed. for laser applications that do not generate debris , removing the protective window will increase work distance . Working range increases with DOF, from 8.7mm for minimal DOF to 11.6mm for maximal DOF.
| Full Specs (link) | Add to Quote | ||||||
| 0.08mm-1.5mm | Add to Quote |
Have any questions you can’t find the answer for, or you need different parameters for your Variable DOF Bessel Objective? Contact us
VB Module on testing setup
