Ma. Vaneijkelenborg et al., MEASURING THE INTRACAVITY BIREFRINGENCE IN A GAS-LASER WITH NEUTRAL COUPLING, Optics communications, 124(5-6), 1996, pp. 462-468
We present a new method to determine the linear birefringence inside a
laser cavity. We measure beat frequencies between orthogonally polari
zed modes in the intensity noise spectrum; the novel aspect is that we
employ a gain medium with neutral coupling. Measurements are performe
d on the lambda = 2.026 mu m (J=1 --> J=1) HeXe laser transition.