Optical control system and method
AssigneeMitsubishi Petrochemical Co., Ltd.
InventorsEiichi Hanamura, Tetsuji Tokihiro
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Abstract
An optical control system and method comprised of obtaining optical bistability by radiating a crystal with both the exciton energy level and the excitonic molecule energy level as the optical excition energy level, with a laser beam having energy less than (Em/2-.gamma.), in which Em is the excitonic molecular energy level, an .gamma. is the half-amplitude level of absorption spectrum of two-photon resonance. The advantage of optical bistability is that high speed switching of an order of pico-seconds is possible due to the coherent non-linear response, and that switch-on and switch-off energy required is less than pico-Joule.
Claims6
An optical control method for obtaining optical bistability comprising;
- irradiating a crystal with both an exciton energy level and an excitonic molecule energy level, as the optical excitation energy level with a coherent incident light beam having energy (E) defined by (Em/2-100 .gamma.m).ltoreq.E.ltoreq.(Em/2-.DELTA..nu.-.gamma.m) in which Em is the excitonic molecule energy level and .gamma. is the half-amplitude level of absorption spectrum of two-photon resonance whereby a substantially coherent nonlinear optical response is obtained.
Dependencies are inferred from the claim text.