Fiber Coupling
Perfect for FC/PC patch fibers
Optimized laser fiber coupling and fiber collimation
asphericon’s adjustable fiber collimators / fiber couplers ensure perfect alignment of FC/PC patch fibers in your laser set-up. Combine collimators – available from stock for NAs up to 0.275 – with BeamTuning or other beam shaping elements to obtain any desired output beam while maintaining a diffraction-limited wavefront. The sophisticated optical design enables simple fiber coupling, alignment, and wavefront adjustment with minimal adjustment.
NEW: Looking for a solution to easily alter the effective focal length of your fiber collimator while effortlessly connecting optical fibers to your system? Discover a|VariColl, our latest fiber collimator/fiber coupler, which is ideal for illuminating beam-shaping elements thanks to the separate adjustment of divergence and beam diameter.
a|AspheriColl
Specifications & Technical dimensions [mm]
- Fiber collimator covering for NA’s up to 0.275
- Focal length f = 20 mm, with Øe= 11,5 mm
- Optimized for wavelength range 350 nm – 1600 nm
- Easy wavelength adjustment
- Perfectly aligned lateral position
- Completely diffraction-limited performance (Strehl > 0.95) when used with FC/PC patch fibers
- Thanks to matching adapters also usable for APC fibers
- No truncation effects compared to other available fiber couplers/fiber optic collimators
- Thanks to bigger output beam diameters, no additional expansion might be needed (shorter system length)
Output beam diameter
The diameter of the collimated output beam generated by an a|AspheriColl depends on the NA of the fiber from the laser source. This is a function of the wavelength.
The basic diameter is set as shown in the following graph. Pre-aligned for the wavelengths [nm] 355, 532, 632, 780 and 1064, the a|AspheriColl collimates output beams from single mode fibers with NA’s up to 0.275.
Optical performance
The map on the right shows the measured wavefront of an a|AspheriColl at 632nm. The diameter of the collimated output beam, which depends on the fiber’s numerical aperture (NA) and mode field diameter (MFD), is already in a usable range. The fiber collimator is already perfectly aligned to the design wavelength. If needed, it can also be adjusted in a certain wavelength range. Due to its outer diameter of 30 mm the a|AspheriColl fits into any standard holder (e.g. from OWIS). By simply pluging in the fiber, the a|AspheriColl is ready to use.
Wavelength range
Covered range of wavelengths for fiber optic coupling/fiber collimation with the a|AspheriColl for the design wavelengths [nm] 355, 532, 632, 780, 1064.
a|VariColl
Specifications & Technical dimensions [mm]
- Effective focus length: 47–99 mm
- Fiber collimator for NAs from 0.055 to 0.12
- Available in four design wavelengths (532 nm, 632 nm, 780 nm, 1064 nm)
- Wide spectral range: 500–1,200 nm
- Generation of collimated diffraction-limited beams up to 11 mm 1/e² with RMS wavefront error < 50 mλ
- Adjustable beam diameter with constant divergence within the design wavelength
- Precise adjustment of divergence also possible
- Perfect for illumination of a|TopShape, a|AiryShape, and a|SqAiryShape, as the separate adjustment of divergence and beam diameter allows optimal input conditions
- Laser induced damage threshold: 12 J/cm², 100 Hz, 6 ns, 532 nm
Wavelength range
Covered wavelength range of the a|VariColl fiber collimator for the design wavelengths [nm] 532, 632, 780, 1064.
Flexibility
The a|VariColl was developed to compensate for variations in the numerical aperture (NA) of fibers due to manufacturing. For NAs in the range of 0.055 to 0.12, an output beam with a maximum 1/e² diameter of 11 mm can be achieved in diffraction-limited quality. For NAs below 0.12, smaller diffraction-limited diameters are also possible (see diagram).
Optical performance
Are you looking for a solution to smoothly change the EFL of your fiber collimator while easily connecting the patch fiber to your setup? The diagram shows the measured wavefront and intensity profile of the a|VariColl 532 nm. One of the key features of the a|VariColl is that a collimated beam remains collimated, no matter what beam diameter you choose. The a|VariColl generates a diffraction-limited wavefront and is thus perfectly suited for the use of beam-shaping optics, for example from asphericon’s BeamTuning range (a|TopShape, a|AiryShape, a|SqAiryShape). In particular, the separate adjustment options for divergence and beam diameter create optimal input beam conditions.
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