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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
GAUSSIAN BEAMS 287
beam diameter, but now our goal is to achieve a waist at a specic distance, and we want to
know what lens to use and how large the waist will be. We decide to solve the second part of
Equation 9.9 for b:
b
=
b
2
+z
2
b
b =
b
±
b
2
4z
2
2
,
which will have a solution (or two) provided that b
> 2z. In fact, from the previous section,
and Figure 9.3, we know that we cannot generate a waist at a distance beyond half the con-
focal parameter, b
of the beam diameter, d. Once we have solved this equation, we can then
determine ρ, which will be negative in this case, and the required focal length, f =−ρ.For
example, suppose that for an endoscopic
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Publisher Resources

ISBN: 9781439807255