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Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
book

Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition

by John G. Webster, Halit Eren
February 2014
Intermediate to advanced content levelIntermediate to advanced
1921 pages
82h 13m
English
CRC Press
Content preview from Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
52-1
52.1 Introduction
A laser is a device that emits an optical beam. A laser beam carries a certain amount of optical power.
Lasers emit beams in two dierent ways: continuous wave (CW) or pulsed. A CW laser emits a steady
po
wer
as sh
own
in Fi
gure
52.1. CW la
ser
po
wer
is me
asured
in te
rms
of wa
tts
. e po
wer
of co
mmonly
us
ed
CW la
sers
ra
nges
fr
om
a fr
action
of mi
lliwatts
fo
r
a sm
all
he
lium–neon
(H
e–Ne)
la
ser
to te
ns
of
ki
lowatts
fo
r
a ca
rbon
di
oxide
(C
O
2
) laser. A pulsed laser emits a pulsed power as shown in Figure 52.2.
e pulse can be repeated. e pulse duration and repetition rate vary for lasers of dierent types and
ar
e
ad
justable
fo ...
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Publisher Resources

ISBN: 9781439848913