F-Theta Lens - RAYLASE AXIALSCAN Manual

Functional description
For subsystems fitted with an F-Theta lens only
4.5

F-Theta lens

The F-Theta lens is specially designed for use with 2-axis deflection units or in
FOCUSSHIFTER 3-axis subsystems. It focuses the laser beam at optimum quality on any
position in the operating field. At the same time, it provides partial optical compensation for
the barrel-shaped distortion that is unavoidable when using a 2-axis deflection unit. The re-
maining distortion (see below) must be compensated by the deflection unit drive.
Distortion caused by two-mirror
deflection.
1 Lens element inc. lens
2 Protection window
Installation instructions
o Before installation, check the lens and the protection window for dirt, scratches or cracks.
If the optical system is dirty, it must be cleaned ( page 49, Instructions for cleaning
-
lenses and protective glasses).
A scratched or cracked lens and/or protection window must be replaced. If necessary,
-
the protection window can be replaced separately.
o Screw the lens into the beam output on the deflection unit until it is positioned securely.
MN025 / v2.1.0
Distortion caused by F-Theta
lens.
3 Clamp ring
4 Protective cap
3-Axis Subsystems for Laser Beam Deflection
Distortion caused by two-
mirror deflection and F-Theta
lens.
Chapter 4
Fig. 11
Field distortion
with and without
F-Theta lens
Fig. 12
Example:
F-Theta lens for
Nd:YAG
27