Abstract
Astigmatism in transverse-mode-stabilized InGaAlP laser diodes with a ridge-stripe structure depends strongly on the laser structure, especially on the active layer thickness which influences the noise characteristics. The astigmatism dependences of index-guided lasers and gain-guided lasers on the active layer thickness exhibit opposite behavior. Both the index-guiding effect and gain-guiding effect are found to appear, depending on the dimensions of the ridge-stripe structure.
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