LASER INDUCED OSCILLATORY PHENOMENA IN AMORPHOUS GeSe2 FILMS

Studying the optical properties of 5p to 10p thick GeSe2 glassy films under the influence of focussed, continuous He-Ne laser beams a region of medium intensity 11.4 to 2.7 kb7/crn2) is found where a low frequency (3 to 5 Hz) periodic pulsation in the absorption coefficient sets in. A tentative explanation is suggested in terms of laser induced self-trapped exciton states of the material.