Abstract

Two kinds of self-starting User oscillators with Cavity formed by holographic gratings induced in an active medium by generating beams themselves have been studied so far. The self-starting oscillation has been achieved in the cavity formed by gain gratings in6 the presence of the amplitude and phase nonreciprocity.¹ Another kind of the self-starting laser with a reciprocal cavity completed by refractive-index grating in a laser crystal has also been demonstrated.² The both schemes of the self-starting lasers can he realized by use of a Nd:YAV laser crystal. For the nonrecipracal cavity, gain gratings were supposed to play the main role for the positive feedback, whereas in the reciprocal cavity moving refractive-index gratings may provide the generation condition.^1,2

© 2002 Optical Society of America