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STRIPE‐GEOMETRY DOUBLE HETEROSTRUCTURE JUNCTION LASERS: MODE STRUCTURE AND cw OPERATION ABOVE ROOM TEMPERATURE
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9.The active region current densities were estimated by measuring the spontaneous radiation distribution of the laser mirror below threshold. This method is only approximate to about 20% because the relative current spreading decreases with higher injection. Near‐ or far‐field sizes above threshold cannot be used to estimate the threshold current density since they are governed by internal focusing, which was shown in Ref. 6 to be independent of the stripe width. This was confirmed in the present work by noticing that the lasing modes are much narrower than the spontaneous emission region width. It is interesting to note that the current spreading is much more significant than in the homostructure lasers reported in Ref. 5, where at room temperature the active region was only about 2 μm wider than the stripe. This is because the present diodes have deeper junctions and operate with much less current.
10.R. H. Roldan, J. Sci. Instr. 40, 1388 (1969).
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