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We have simulated a kind of 1060 nm quantum-well lasers with double mode expansion layers, threshold current of 158 mA and the far field vertical divergence angle of 13°. The far field vertical divergence angle can be as low as 10° with the threshold current of 266 mA. The effects of mode expansion layer on quantum-well lasers performance have been investigated.
We designed a new waveguide structure of "reversed-graded index" (RGRIN) layer to reduce the vertical far-field divergence, and optimized the RGRIN structure with LASTIP program. By expanding the light field outside active region and keeping the confinement factor at the same time, a RGRIN structure with small vertical divergence angle and low threshold current has been obtained. Compared...
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