Cavity Stability for the HeNe Laser:
To measure the power of the laser beam with respect to the laser cavity length, the equipment needed was a detector and a voltmeter. The position of one mirror was adjustable, in this diagram it is the mirror in the black stand. A detector was hooked up to a voltmeter in order to record the intensity of the beam. The adjustable mirror was initially as close as possible to the laser's glass tube. The mirror was moved away from the glass tube in 2.6 cm increments unitl it was as far as possible from the other mirror and still in front of the detector. Voltages were recorded and a graph of intensity versus cavity length was generated.
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