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GaInP-(AlyGa1-y)InP 670 nm quantum-well lasers for high-temperature operation

Smowton, Peter Michael ORCID: and Blood, Peter 1995. GaInP-(AlyGa1-y)InP 670 nm quantum-well lasers for high-temperature operation. IEEE Journal of Quantum Electronics 31 (12) , pp. 2159-2164. 10.1109/3.477741

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We have examined the operation of 670 nm (AlyGa1-y )InP/GaInP quantum well lasers with different aluminium compositions (y=0.3, 0.4, and 0.5) in the barrier/waveguide layer so as to vary the optical confinement factor and hence the threshold gain requirement. Lasers with y=0.3 have the lowest threshold current over the range 200-400 K despite having the narrowest barrier band gap of the three structures. The measured intensity of spontaneous emission due to transitions in the well increases linearly with temperature between 280-400 K, whilst that from the barrier increases exponentially. An Arrhenius treatment of the emission from the barrier gives an activation energy of 198 meV±25 meV which is in excellent agreement with the value predicted from the energy band diagram. When the experimental temperature dependence of the well and barrier contributions are removed from the measured threshold current, the remaining excess current has an activation energy of around 320 meV which is in excellent agreement with the value for thermally activated loss of electrons via the X conduction band minima. Since the X gap is insensitive to composition there is no increase in this leakage current when y is reduced so the overall effect is for the current to go down due to the reduced gain requirement per well.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: Institute of Electrical and Electronics Engineers
ISSN: 0018-9197
Last Modified: 20 Oct 2022 09:10

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