Patent ID: 6101203
Filing Date: 2000-08-08
Classification: G02F,H01S

Abstract:
A function element comprising:a solid body including quantum structures having a first level, a second level lower than said first level, and a third level lower than said second level;a light-applying device configured to apply a first coherent light beam to the solid body to excite an energy transition between the first and second levels, and to apply a second coherent light beam to the solid body to excite an energy transition between the first and third levels; anda field-applying device configured to apply an external field having a phase, an angular frequency, and a Rabi frequency to the solid body to excite an energy, transition between the second and third levels, said field-applying device being configured to control any one of the phase, the angular frequency, and the Rabi frequency of the external field in order to control transparency of the solid body relative to the first and second coherent light beams,wherein the following conditions are satisfied:.sigma..sub.23 .ltoreq..sigma..sub.12 and .sigma..sub.23 .ltoreq..sigma..sub.13,wherein .sigma..sub.12 is standard deviation of resonance angular frequencies .omega..sub.12 (i) between the first and second levels, .sigma..sub.13 is standard deviation of resonance angular frequencies .omega..sub.13 (i) between the first and third levels, and .sigma..sub.23 is standard deviation of resonance angular frequencies .omega..sub.23 (i) between the second and third levels, for all n number of quantum structures existing in the solid body, and .sigma..sub.12, .sigma..sub.13 and .sigma..sub.23 are represented as follows:.sigma..sub.12 ={(1/n).SIGMA.[.omega..sub.12 (i)-<.omega..sub.12 >.sup.2 ]}1/2,.sigma..sub.13 ={(1/n).SIGMA.[.omega..sub.13 (i)-<.omega..sub.13 >.sup.2 ]}1/2,.sigma..sub.23 ={(1/n).SIGMA.[.omega..sub.23 (i)-<.omega..sub.23 >.sup.2 ]}1/2,where <.omega..sub.12 > is an average of the resonance angular frequencies .omega..sub.12 (i) (i=1 to n), <.omega..sub.13 > is an average of the resonance angular frequencies .omega..sub.13 (i) (i=1 to n), and <.omega..sub.23 > is an average of the resonance angular frequencies .omega..sub.23 (i) (i=1 to n).