NOISE MEASUREMENTS ON He-Ne LASER OSCILLATORS

Further measurements on the noise of a D.C. excited HeNe laser oscillator

“…Other authors finding considerably less excess noise in different types of He-Ne lasers [2][3][4][5], have suggested that the excess noise is a modulation effect of discharge fluctuations on the laser beam [3,5]. Our further measurements to be described here confirm this suggestion.…”

Acoustic-surface-wave amplitude and phase measurements using laser probes

“…If the phase at a point A on the guide is # A (w), and the phase at a downstream point B is ^(to), <k(w) = <*> A (w) + /3L (26) where /3 = 2v/\ = w/vp and L = nX. If n is an integer, the phase difference between points A and B is zero, and the phase velocity is given by…”