| 摘要 |
Disclosed is an apparatus utilizing a light emitting semiconductor device which has a pumped region and an unpumped absorber region and in which an active layer has a quantum well structure. In this light emitting semiconductor device, driving current/light output characteristics have dependence on the pulse width of a driving current. A logic unit or a noise reducing apparatus is realized utilizing this property. Furthermore, in the above described light emitting semiconductor device, the central wavelength of emitted light has dependence on a driving current or dependence on driving time. A light beam scanner can be realized utilizing this property.
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