- Aspect ratio up to 1:3
- Polarization circularly polarized
- Gaussian intensity profiles along both elliptical axes
- Rugged and compact design
- A front-fitting for attachments, such as a diaphragm
for an ellipical beam cross-section and with a circular state of polarization
In some quantum optical experiments, collimated laser beams with an elliptical cross-section and a circular state of polarization are used, for example as cooling beams in two dimensional magneto-optical traps (2D-MOTs) or in mirror MOTs. They are suitable for polarization-maintaining fiber cables leading to collimated beams with a Gaussian intensity profile and an elliptical beam cross section with an axis ratio of up to 1:3.
An optics for each application
A large variety of optical designs allows that the optimum focal length and the aspect ratio you need can be selected for each application. All lenses are AR-coated.
The radiation of the fiber is collimated to a beam with a diameter in the range Ø 1 - 4 mm.
In this collimated beam a low-order quarter-wave plate changes the state of polarization from linear to left-handed or to right-handed circular. An adjacent anamorphic beam shaping optics transforms the circular beam into a beam with an elliptical cross section. Finally the beam is expanded to the desired diameter.
Adjustment of focus
All fiber collimators of seris 60FC-E-Q are aligned for the specified wavelength.
In case of need you can change the distance between fiber end-face and the first collimating optics by means of an eccentric key. The lens does not rotate when adjusting the focus fo both cases. The final focus setting is locked by means of two radially arranged clamping screws. Additionally attachment optics can be mounted to the front of the collimator.
Optimum lens performance
The angled polish of connectors of type APC is considered by a pre-angled mechanical coupling axis that compensates the beam deflection and you can use the lens centrically. This minimizes aberrations simply resulting from a non-ideal beam path through the lens.
The fiber collimator can be equipped with FC PC (wide key*), FC APC (wide key*), SMA-905 (F-SMA), ST or LSA (compatible with fiber connectors type DIN, AVIO and AVIM) receptacles. In case of FC or LSA with a spring loaded ferrule the fiber coupler has an additional grub screw to increase pointing stability.
The fiber collimators are made of nickel silver and black anodized aluminum.
The collimators series 60FC-E-Q all posses a flange for low-strain mounting e.g. using the clamp collars series CC.
Besides these series 60FC-E-Q fiber collimators there is the series 60FC-E. These fiber collimators generate a collimated beam with elliptical cross section and a linear state of polarization.
When the ferrule tip is safely located in the inner cylinder of the receptacle, align the connector to the receptacle axis and carefully introduce the connector into the fiber coupler.
Then, orient the connector key in a way that it is pressed gently onto the right-hand side of the receptacle notch.
The tightened grub screw and the "right-hand orientation rule" for the connector, ensure a high reproducibility in mode field position and angle, which is especially important for attaching and reattaching polarization-maintaining fibers reproducibly.
Yes, you can- without any problem. Simply adhere to the "right-hand orientation rule".
Generally, with any FC PC or FC APC type connector there is a freeplay when inserting the fiber into the fiber coupler. The free play in between the connector ferrule and receptacle is only a few microns, but necessary for inserting the ferrule without force. There is a difference between the receptable and key width for wide key (2.14 mm) and narrow key (2.0 mm) fibers. If you follow the so-called "right-hand orientation rule" you can reproducibly attach and reattach even PM fibers with narrow key receptacle to fiber couplers with wide key receptacle without difficulty.
"Right-hand orientation rule":
When the ferrule tip is safely located in the inner cylinder of the receptacle, align the connector to the receptacle axis and carefully introduce the connector into the fiber coupler. Then, orient the connector key in a way that it is pressed gently onto the right-hand side of the receptacle notch. The tightened grub screw and the "right-hand orientation rule" for the connector, ensure a high reproducibility in mode field position and angle, which is especially important for attaching and reattaching polarization-maintaining fibers reproducibly.
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