ESAW Sagnac Interferometer (MP-7586)
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Product Description
ESAW Sagnac Interferometer (MP-7586)
The Sagnac effect manifests itself in an experiments setup called ring interferometry. A beam
of light splits and the two beams are made to follow a trajectory in opposite directions. To act
as ring, the trajectory must enclose an area. On return to the point of entry, the light is allowed
exit to the apparatus in such a way that an interference pattern is obtained. The arrangement
for Sagnac interferometer is as shown in the figure. Sagnac interferometer employs modular in
design and construction. Mirrors beam splitters and lasers along with mechanical mountings
are supplied as individual modules which can be assembled on honey comb bread board. The device consists of 800 mm x 600 mm honeycomb breadboard with a rigid and vibration
resistant base for assembling the interferometer. Mirrors and beam splitters are held in
precision kinematic mounts for fine alignments. Laser head is also held in a kinematic mount
for fine tuning the direction of the laser beam. Students gain hands on experience in optical
instruments assembly by setting up the interferometer. Sagnac effect is employed in current
technology. One of the use is in internal guidance system. Ring interferometers are extremely
sensitive to rotations. In the Sagnac configuration, the position of the interference fringes is
dependent on angular velocity of the setup. This dependence is caused by the rotation,
effectively shortening the path length of one beam, while lengthening the other.