Abstract:
This work aimed to study the Kerr effect on the
transmission of He-Ne laser through atmosphere. Kerr cell
was used as a modulator to modulate the signals that had
been generated from a signal generator. The cell is made
of PLZT-element, and operated by using a power supply
with 500 volt. He-Ne laser beam (632.8nm) with power of
1mW was used as a beam carrier. The beam was
transmitted through the modulator and then, through the
atmosphere to be collected by the receiver at different
distances. The divergence of the beam, the signal to noise
ratio, transmittance of the beam through atmosphere and
the modulation index were measured and calculated. The
result of the divergence of the beam was found to be
1.44mrad and the signal to noise ratio was equal to 6.06
at night and at midday it is equal to 2.6; Finally the
modulation index at night was found to be 0.525 and at
midday
was
equal
to
0.48.This
means
that
the
transmittance of the beam at night is greater than at
midday.
