Telescope of Galilean type ( without internal focus)
Input beam
- TEMoo, Collimated or low divergence
- Diameter <16 mm
- Optimum 2w diameter for a Gaussian beam 4...8 mm (1/e2)
Output beam
- Collimated or low divergence
- Profile is optimized for Intensity distribution manipulation in focal plane of a diffraction limited lens
- Diameter <16 mm
Other features
- Easy integration to an optical setup and adaptation to a laser source
- Compact design suitable for scientific and industrial applications
- A diffraction limited focusing lens of any type can be applied with the F-piShaper
- Easy tolerances for alignment as well as positioning of the F-piShaper with respect to a focusing lens
- Capability to work with scanning mirrors
Overall dimensions
- Diameter 41 mm
- Length 110 mm
Mounting
External Thread M 27x1
Weight
200 g
Features
Model
_1450
_1064
_TiS
_532
_355
_266
Operating wavelength range, nm
1350 - 1550
1020 - 1100
750 - 850
520 - 550
330 - 380
250 - 280
Applications based on
near IR-lasers
Nd:YAG, Fiber and
other
near IR-lasers
Ti:Sapphire laser,
near IR lasers
2nd (532)
Harmonics
of
Nd:YAG laser
3rd (355)
Harmonics
of
Nd:YAG laser
4th (266)
Harmonics
of
Nd:YAG laser
* - working wavelength range without taking into consideration on the coatings
** - according to coatings applied
Basic principles of Focal-piShaper (or F-piShaper) operation:
F- piShaper is a telescopic optical systems that transforms Gaussian or similar Intensity distribution of TEMoo laser beam to a beam providing manipulation of intensity profile in area of Focus of the focusing lens;
F- piShaper can be easily (by turning one ring only!) adapted to beams of various diameters, for the F- piShaper_9_xxx optimum 2w diameter range is 4-4.5 mm (1/e2);
Low sensitivity to misaligments and beam size variation;
The transformation is provided for a certain wavelength range;
Optical design without internal focusing of a beam;
Any focusing lens could be applied; the only condition is the lens to be diffraction limited one;
There are no limitation on applying scanning mirror heads.
Drawings:
Examples of the Focal-piShaper operation
Intensity profiles of focused beams under various F-piShaper settings (Courtesy of Altechna)
Input beam diameter 6 mm
Input beam diameter 4.2 mm
Scribing by TEMoo femtosecond Laser (Courtesy of Altechna)
Focusing by an ordinary lens, without Beam Shaping
Focal-piShaper installed in front of a focusing lens
Heating by Fiber Laser (Courtesy of CARS, University of Chicago)
Comparison of heating of tungsten foil by:
- a TEM01 beam focused by a lens (left column),
- a TEM00 beam focused by a lens with a Focal-piShaper installed ahead, (right columns).
Power is stepwise increased in top-down direction.
Brightness of a dot corresponds to temperature.
One can see variation of effective beam diameter in case of non-shaped TEM01 beam (by the way with a TEM00 beam the diameter variation would be greater) and almost constant beam diameter with only variation of temperature (brightness) in case of TEM00 beam with a Focal-piShaper.
