Record of hologram of 2 step gate types to inside the optical refraction substance which uses the CW laser

摘要

(57) Abstract At 2 photon record system the reversible holographic record medium which is used (25) as the dielectric substance is disclosed strongly. Strongly the dielectric it is disclosed here substance strongly offers a intermediate electronic state where life is long to the valence band and the conduction band of the dielectric substance. Sufficiently long life (1 - 100 milli-seconds) it possesses these intermediate states, it is possible to record interference pattern on that the low power output continuous wave (cw) making use of the laser (1). Furthermore, high output and, shortly pulse length, 2 photon holographic record system which does not require the mode lock and the Q switch laser is disclosed. The holographic record system which is disclosed visible like the diode laser and uses the infrared cw laser closely. 2 photon holographic record system which is disclosed excites the electron of holographic record medium in intermediate state with the absorption of the first photon. After this, adding, when the 2nd photon is absorbed, the electron is excited in the conduction band of medium, the electron is arranged in the conduction band according to the interference pattern which is given by the record system.