Fiber Collimators Series 60FC
Adjustment_60FC 10.12.2020 © Schäfter+Kirchhoff GmbH
Schäfter+Kirchhoff GmbH Kieler Str. 212 22525 Hamburg, Germany +49 40 85 39 97-0 [email protected] www.sukhamburg.com
5
3. Adjusting the Collimation Setting
Collimation adjustment (adjustment of the collimating lens in z-direction) is a demanding task and should be
performed preferably using a collimating telescope.
The fiber collimator is shipped pre-adjusted for the labeled wavelength and,
often, it is not necessary for the customer to readjust the lens position. This
is why you can skip this step in most cases.
Notice:
To check the collimation setting of the fiber collimator, couple a radiation source of appropriate wavelength into
the fiber connected to the fiber collimator. Direct the beam to a target about half a Rayleigh length z
R
away:
z
R
π
∙
∅
2
beam
=
2
λ
∙8
Here
λ
is the optical wavelength and Ø
beam
the collimated beam diameter (1/e
2
level).
Refer to the laser instruction manual for all instructions regarding laser
safety!
• Do not stare directly into the laser beam (which can cause permanent
damage to the eyes).
• Do not stare at the reflected beam from reflective objects.
• Do not point the laser beam to other individuals.
Caution!
When correctly collimated, the laser spot diameter on a target about z
R
/2 away must have approximately the
same diameter such as the beam directly behind the fiber collimator. Additionally, make sure that there is no
focused spot between the fiber collimator and the target at z
R
/2.
The collimation setting is adjusted by means of an eccentric key. The eccentric key type 60EX-4 is used for
fiber collimators with focal lengths
≤
11 mm. For fiber collimators with focal lengths
≥
12 mm please use the
eccentric key type 60EX-5.
For adjusting the collimation setting perform the following steps:
Figure 9:
Loosen the two grub screws fixing the
lens position by means of a screwdriver
type 9D-12.
