Portable Optical Tweezers Kit
Chapter 5: Setup and Adjustment
Rev B, February 15, 2022
Page 55
5.4. Beam Adjustment
Warning
The class 3B laser diode used in this kit can emit more than 50 mW of optical power,
which can cause damage to the eyes if viewed directly. The laser driver is equipped
with a key switch and safety interlock, which should be used appropriately to avoid
injury. Additionally, we recommend wearing appropriate laser safety glasses
when using this kit.
Step 1: Preparation
•
Remove the removable cage
segment with the two lenses
forming the beam expander.
•
Take the laser out of its
mount by opening the locking
screws on the holder. Guide it
through the CP45T(/M) cage
plate.
•
Screw in the collimation lens’
retaining ring as far as
possible.
•
Screw in the collimation lens
as far as possible (as close to
the diode as possible), see
image to the right.
Step 2: Collimation
•
Turn the safety key on the KLD101 laser driver to ON.
•
Press the “Laser On” button.
•
Turn the knob to set the diode current to 50 mA.
•
After ensuring that the area is clear of other people, point the laser at a wall,
preferably more than 3 m away.
•
Slowly screw the collimation lens away from the diode until you see the laser light
distribution on the wall has turned into a small spot. Note that the pattern will be
slightly asymmetrical. That is not a problem.
•
Fix the collimation lens with the collimator’s locking ring.
•
Turn off the laser by pressing the button near the “Laser On” light once again.
16
Make sure you have set the maximum current to protect the laser diode, see Chapter 5.2.2.
Summary of Contents for EDU-OT3
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