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Optics for Engineers
book

Optics for Engineers

by Charles A. DiMarzio
August 2011
Intermediate to advanced content levelIntermediate to advanced
564 pages
20h 45m
English
CRC Press
Content preview from Optics for Engineers
COHERENCE 327
Figure 10.11 Speckle size in laser radar. A laser radar system with a diverging Gaussian
beam produces a footprint on a distant target that increases linearly with distance.
as in Section 10.4.3.1, the scattered light behaves like an incoherent source with a diameter
determined by the laser footprint on the target. The equation is the same as Equation 10.66,
but the values are quite different. Let us assume that the beam is Gaussian with a diameter
d
0
= 30 cm, from a carbon dioxide laser with λ = 10.59 μm. Then, at the target, using
Equation 9.23,
d
target
= d
0
1 +
z
2
t
b
2
, (10.68)
where z
t
is the distance from the laser transmitter to the target. ...
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Publisher Resources

ISBN: 9781439807255