THORLABS OTKB Manual page 13

5) Adjusts the FiberPort to collimate the beam. (Two people may be required.)
A) Attach a connectorized fiber source to the bulkhead of the FiberPort and examine the output.
B) Adjust the X-Y screws to center the output beam in the tilt plate aperture.
C) Trace the beam away from the FiberPort to check for collimation.
a) For a converging beam (beam comes to a focus): The lens is too far away from the fiber.
Alternately turn the Socket Head Cap Screws (SHCS) clockwise in small, equal
increments. Be sure to adjust all screws in equal increments.
b) For a diverging beam (beam diameter continually increases): The lens is too close to the
fiber. Alternately turn the SHCS counter clockwise in small, equal increments. Be sure to
adjust all screws in equal increments.
D) Check the beam path and adjust the X-Y screws as needed to re-center the beam in the output
aperture.
E) Use progressively smaller adjustments until collimation is achieved and the desired beam
centration is obtained. Do not force the screws past their normal operating range, if
collimation is not easily achieved please contact Tech Support for assistance.
F) Ensure that the beam is parallel to the cage structure by sliding the alignment plate (Item #
VRC4CPT) along the ER6 cage (temporarily attached) rods as shown on Figure 6.1.1 (left)
with the iris adjusted to its smallest aperture. The intensity of the beam transmitted through
the hole in the alignment plate should be constant as the distance the alignment plate is from
the iris is changed.
Figure 6.1.1 (Left) FiberPort Alignment Configuration, (Right) FiberPort showing adjustments
6) Turn off the laser and remove the ER6 cage rods and ring-activated iris.
7) Attach four ER05 cage rods to a KCB1 right angle mirror mount and secure a mirror, PF10-03-
P01 to the KCB1.
8) Connect the KCB1 assembly to the FiberPort assembly through the ER05 rods. The ER05 cage
rods should be secured in the CP08FP adapter and the other end of the KCB1 right angle mirror
mount. The ensuing model is shown in Figure 6.1.2.
9) Temporarily attach two ER6 cage rods to the top two tapped holes on the output face of the
KCB1.
19590-D04-V15; Apr 12, 2012
Iris
VRC4CPT
Page 13
CP08FP
screws.
Optical Trap Kit
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