Optical Trap Kit
19590-D04-V15; Apr 12, 2012
Page 15
www.thorlabs.com
8.
Mount the second lens, AC254-150-B to a half inch long lens tube, SM1L05.Thread this lens
tube holding the lens unto the other side of the CP02 above. Note that the lens should be
positioned in lens tube such that the trap beam goes through lens from the concave side.
9.
Mount a CP02T thick Cage Plate on a CPB1 Cage Plate Mounting Base. Attach a new SM1L05
to one side of the CP02T.
10.
Connect an ER4 cage rod to an ER1 cage rod to produce a 5˝ long cage rod. Repeat so that you
have two 5˝ cage rods. You may remove the threaded studs from the ends of the assembled 5˝
cage rods.
11.
Connect the assembly from steps 7 to 9 together using the rods created in step 10 as shown in
Figure 6.2.1. The cage rods are located diagonally from each other. In this arrangement, you
have the flexibility of manually adjusting the position of the second lens along the optical axis
over a range of approximately 12mm. If you want to enclose the beam completely, then you can
put segments of the lens cover SC1L24 (not included) over the two open sections in Figure 6.2.1.
You will need a two inch long cut (for the first section) and a one inch long cut (for the second
section).
12.
Close the bottom of a C6W cube using a B1C.
13.
Remove the studs from one end of two ER1 rods and fully thread the ends with studs onto the
diagonal (as shown in Figure 6.2.2) of the C6W from previous step. Connect this C6W to the
CP02T from Step 10 using the two ER1 cage rods. The cage rods should be located diagonally
across the cage from each other. Do not use the same orientation that was used in Step 11.
14.
Temporarily attach two ER6 (or longer) cage rods to the C6W on the opposite (rear) side of the
cube. Use the upper mounting holes.
15.
Use an iris on the cube and a VRC4CPT alignment guide resting on the ER6 cage rods to ensure
that the beam is still aligned to the center of the cage system. If the beam is off, you may need to
correct this by small adjustments on the KCB1 mirror.
16.
Remove the temporary ER6 cage rods and close the port on that face of the C6W cube using an
SM1CP2.
Figure 6.2.1: Building the beam expander segment
SM1V10
holds first
lens
SM1L05
holds
second lens
CP02T
