Portable Optical Tweezers Kit
Chapter 7: Teaching Tips
Rev B, February 15, 2022
Page 77
Unfocused Laser Beam Momentum
For example, the vector labeled with
𝑝𝑝
(
𝑡𝑡
, 1)
depicts the momentum of the beam
𝑡𝑡
at
position 1. It important to note that the magnitude of the momentum, i.e., the length of the
arrows, does not change. However, the direction changes. In Figure 57, the vectors before
the entry of the beam into the sphere (position 1) and after the exit (position 3) are
subtracted to see how the momentum changes. The momentum change is depicted as
orange arrow.
Unfocused Laser Beam Momentum Changes
To obtain the net momentum change of both partial beams, we add both orange change
of momentum vectors in Figure 58. This line of argument can be transferred qualitatively
to the entire bundle of partial beams.
Summary of Contents for EDU-OT3
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