Hitachi Europe Limited

Albert P Heberle

Jeremy John Baumberg

Optically generated charge carriers in an optically responsive medium, such as an optical switch, which are produced in response to a first pulse of optical radiation (P,), are de-excited by directing a second pulse (P,) of optical radiation into the medium. The second pulse occurs while the excitation produced by the first pulse remains coherent, and the relative phase of the first and second pulses is selected so that the second pulse destructively interferes with the excitation produced by the first pulse. The apparatus may be used as an optical switch or as a photodetector.

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Cambridge, United Kingdom

Albert P Heberle