1/2 〈100〉 {100} dislocation loops in a zinc blende structure

We report, for the first time, the identification of extrinsic dislocation loops lying on the {100} planes with 1/2〈100〉 types of Burgers vectors in a zinc blende structure in InGaAsP lattice matched to InP. These dislocation loops generated only in nonradiative recombination assisted point-defect motion process under intensed laser light, and form the 〈100〉 type dark line defects in degraded 1.3 μm wavelength laser diodes.