Question

. In case of gas lasers 10 is as small
ans.
Intensity (Coche
(iv) tensity of light from a conventional sa
sas lasers 40 is as small as 10% to 10
(iv) Intensity
.. (14.15)
sht from a conventional source decreases rapidly with distance, as it spre
rical waves. One can look at the source without any harm to his eyes. In contrast,
e form of a narrow beam which propagates in the form of plane waves. AS
he form of spherical
ser emits light in the
rgy is concentrated
ed that light from a
Tow beam whichce without any with distance, as it sprenda
wted in a very narrow region, its intensity would be tremendously high. It is esti-
om a typical l-mw laser is 10,000 times brighter than the light from the sun at the
The intensity of the laser beam stays nearly constant with distance as the light travels
ne form of plane waves. As the
ch's surt
face. The intensity of the laser bear
form of plane waves
Monochromaticity con
ne id
(V) Monoch
(The light from norm
Å to 1000$. Th.
m normal monochromatic sources spreads over a wavelength range of the order of
The laser light is highly monochromatic. The spread is of the order of a few ang-
only. Such a vast aurerence arises because conventional sources emit wave trains of
tion and length, whereas lasers émit continuous waves of very long duration
y short duration and 1
Lasers are mainly div
lasers and (iv) solid stat
region. Lasers can be op
her output power.
3. TYPES OF LASERS
emainly divided into four categories(i) solid state lasers (in) gas lasers (iii) liquid
(iv) solid state diode lasers (semi-conductor lasers). Most lasers emit light in the red or
Lasers can be operated in a CW (continuous wave) mode or in a pulsed mode with a
3.1. Solid State Lasers
Historically, the first working laser was a solid state laser. It is a ruby laser built by T.H. Maiman
ito Incers are two other popular solid state lasers. In case of solid state
ont in concentrationscampton effect ​

Answer 1

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