Telecentric ƒ-theta lenses provide a perpen-dicular angle of the laser beam onto the image surface. Necessary for drilling holes and structuring the surface.
Besides lenses made of optical glass which are suited for a large field of applications, we offer ƒ-theta lenses made of fused silica lenses. These are recommended for high power laser applications.
Thermal lensing, leading to a focal shift, is be minimised.
Telecentric F-Theta Lenses
In a Nutshell
Short Pulse lasers emit narrowband light with a bandwidth of approx. 1 nm. As the peak power can be very high, non-linear effects (colour centres, self-focusing) can occur in certain glasses.
Ultra Short Pulse lasers in the femtosecond regime have a broad spectral width which makes the use of special glasses necessary to minimize the pulse broadening.
Low dispersion glasses or fused silica lenses are recommended. In addition Sill’s scan lenses are optimised to minimise ghost reflections.
F-Theta Lenses - Pulsed
In a Nutshell
Online inspection - True colour corrected ƒ-theta lenses for 1064 nm and 532 nm.
Confocal Microscopy - Colour corrected ƒ-theta lens optimised for 450 nm to 650 nm and for 355 nm and 1064 nm.
The focal lengths and working distances are identical for all wavelengths, resulting in identical image fields for laser and inspection wavelength.
CCD objectives to image a certain object area through the f-theta lenses are also available
Colour Corrected F-Theta Lenses
In a Nutshell
Standard fused silica F-Theta lenses
Suitable for all high-power-laser applications
Welding
Cleaning
Structuring
Thermal lensing, leading to a focal shift, is minimised.
Fused Silica FTheta Lenses
In a Nutshell
Telecentric ƒ-theta lenses provide a perpen-dicular angle of the laser beam onto the image surface. Necessary for drilling holes and structuring the surface.
Besides lenses made of optical glass which are suited for a large field of applications, we offer ƒ-theta lenses made of fused silica lenses. These are recommended for high power laser applications.
Thermal lensing, leading to a focal shift, is be minimised.
