This paper describes the experimental and analytical investigation on the dynamics of cavitation vapor bubbles in cryogenic liquids. The cavitation vapor bubbles were generated by the irradiation of high intensity Ruby laser beam in a cryostat. The dynamics of the laser induced vapor bubbles in liquid nitrogen under the atmospheric pressure were studied by means of high speed frame camera. Furthermore a simple analytical approach based on the liquid compressibility and the polytropic change in the gas was conducted. The obtained results suggest that the vapor bubble dynamics for cryogenic cavitation are of great importance in the fields of future technology, as the water cavitation dynamics play in the present fluid mechanics. The technique of laser induced bubble experiments has proved to be of great use for such cryogenic cavitation researches.