Micro Focus Optics are used in order to generate small laser spots from the collimated radiation of a fiber collimator.
For spots < 10 times the mode field MFD of the fiber, a good quality spot can no longer be achieved by simply refocusing the collimation optics. Instead, a combination of collimation and focusing optics is needed. The size of the spot and its Rayleigh range is determinded by the fiber properties and by the focal lengths of the fiber collimator and of the micro focus optics. For single-mode fibers the Gaussian intensity distribution and beam shape are maintained.
For the fiber collimators series 60FC-L or 60FC-T with an outer diameter Ø 32 mm Schäfter+Kirchhoff offer Micro Focus Optics with focal lengths in the range f' 35 mm - 500 mm.
There is a large variety of duplet or singlet optics with AR coatings from the UV to the IR wavelengths range.
In order to change the working distance of the Micro Focus Optics the lens position of the adjacent collimator has to be readjusted.
As standard the housing of the Micro Focus Optics is made of nickel silver.
For amagnetic fiber collimators Schäfter+Kirchhoff offers Micro Focus Optics with housings made of titanium.
- Producing spots (3)
When can you produce a spot by simply refocusing the fiber collimator and when is a micro focus optics necessary?