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Mode control in vertical-cavity surface-emitting lasers by post-processing using focused ion-beam etching

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11 Author(s)
Dowd, P. ; Dept. of Electr. & Electron. Eng., Bristol Univ., UK ; Raddatz, L. ; Sumaila, Y. ; Asghari, M.
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Single-mode emission is achieved in previously multimode gain-guided vertical-cavity surface-emitting lasers (VCSEL's) by localized modification of the mirror reflectivity using focused ion-beam etching. Reflectivity engineering is also demonstrated to suppress transverse mode emission in an oxide-confined device, reducing the spectral width from 1.2 nm to less than 0.5 nm.

Published in:

Photonics Technology Letters, IEEE  (Volume:9 ,  Issue: 9 )