Coherent light generators – Particular beam control device – Modulation
Patent
1992-02-20
1994-02-22
Epps, Georgia Y.
Coherent light generators
Particular beam control device
Modulation
372 45, 372 27, 372 71, H01S 310
Patent
active
052894894
ABSTRACT:
A light modulating apparatus includes a semiconductor device having a quantum well structure and a device for applying an electric field to the quantum well structure of the semiconductor device. Both of pump and probe light beams or a pump and probe light beam is input into the semiconductor device. The pump light beam or pump and probe light beam received by the semiconductor device causes a real charge excitation in the quantum well structure, and the real charge excitation screens the electric field applied to the quantum well structure. The polarization state of the probe light beam or pump and probe light beam emerging from the semiconductor device is changed by an electrooptical effect in the quantum well structure induced by the real charge excitation. A polarizer may be disposed for converting a change in polarization state of the light emerging from the semiconductor device into a change in intensity of the light.
REFERENCES:
patent: 5073892 (1991-12-01), Uomi et al.
"New Photorefractive Effect in Graded-Gap Superlattices", Physical Review Letters, Ralph et al., vol. 63, pp. 2272-2275, 1989.
Bergquist Johan
Tomita Yasuo
Canon Kabushiki Kaisha
Epps Georgia Y.
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