Abstract
We report on a very small vertical far-field angle achieved by lasers with a specially designed structure. For an InGaAs-AlGaAs quantum-well laser with a 2.5-μm-wide ridge waveguide, the far-field pattern has a vertical far-field angle of 13° and a lateral far-field angle of 8°. Meanwhile, the threshold current remains acceptably low (≈36 mA for a 500-μm-long cavity). The slope efficiency of the L-I characteristic is high (>0.9 W/A) compared to that of the conventional laser.
Original language | English |
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Pages (from-to) | 1588-1590 |
Number of pages | 3 |
Journal | IEEE Photonics Technology Letters |
Volume | 8 |
Issue number | 12 |
DOIs | |
State | Published - Dec 1996 |