Pd. Floyd et al., SUPPRESSION OF HIGHER-ORDER TRANSVERSE-MODES IN VERTICAL-CAVITY LASERS BY IMPURITY-INDUCED DISORDERING, IEEE photonics technology letters, 7(12), 1995, pp. 1388-1390
Etched pillar, bottom emitting vertical cavity surface emitting lasers
(VCSEL's) employing a zinc diffused and disordered spatial mode filte
r are fabricated and tested, The filters successfully suppress lasing
of higher order transverse modes in VCSEL's with diameters greater tha
n 11 mu m, while obtaining output powers of up to 1.5 mW with threshol
d currents as low as 2.7 mA, Emission is entirely single mode, with mo
de suppression ratio greater than 25 dB up to the highest output power
levels.