Portable Optical Tweezers Kit
Chapter 7: Teaching Tips
Rev B, February 15, 2022
Page 81
Focused Laser Beam Momentum
Figure 65 displays the momentum change of both partial beams.
Focused Laser Beam Momentum Changes
The net momentum change of the entire beam is depicted in Figure 66.
Focused Laser Beam Change in Momentum
The laser beam exhibits a momentum change downwards. Hence, the bead’s momentum
is changed upwards. The bead moves against the beam’s main propagation direction and
into the laser focus. Analogously, one can show that the bead is pushed downwards when
the laser focus is beneath it.
Summary of Contents for EDU-OT3
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