Coherent light generators – Particular component circuitry – Optical pumping
Patent
1991-02-22
1991-12-17
Jackson, Jr., Jerome
Coherent light generators
Particular component circuitry
Optical pumping
357 16, 357 30, 372 43, 372 50, H01L 3300
Patent
active
050738054
ABSTRACT:
In a semiconductor light emitting device comprising an active layer, a hole barrier layer is formed in contact with a first surface of the active layer to provide a barrier against holes in the active layer. The barrier layer does not provide a barrier against electrons tunnelling therethrough. A low energy band gap layer is formed on the barrier layer to have a conduction band minimum which is lower than the conduction band minimum of the active layer at least in a part adjacent to the barrier layer. First and second electrodes are in ohmic contact with an n-type and a p-type conductivity layers which are formed on the low energy band gap layer and a second surface of the active layer, respectively. Preferably, the p-type conductivity layer comprises an electron barrier layer on the second surface, a waveguide layer formed on the electron barrier layer to have an energy band gap wider than an energy band gap of the active layer, and a remaining layer formed between the waveguide layer and the second electrode to have an energy band gap wider than the emergy band gap of the waveguide layer. The waveguide layer may be removable without losing high speed capability of the laser.
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XVI Int'l Conf. on Quantum Electronics, Y. Nomura et al, "Wide Modulation Bandwidth . . . Laser", pp. 54-55 (7/88).
"Gain-Switching Characteristics and Fast Transient Response of Three-Terminal Size-Effect Modulation Laser", Suemune et al, IEEE Journal of Quantum Electronics, vol. QE-22, No. 9, Sep. 1986, pp. 1900-1908.
Nomura Yoshinori
Ogata Hitoshi
Dang Hung Xuan
Jackson, Jr. Jerome
Optoelectronics Technology Research Corporation
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