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Quasi-stadium laser diodes with an unstable resonator condition
Takehiro Fukushima1, Takahisa Harayama, Peter Davis
1Department of Communication Engineering, Faculty of Computer Science and System Engineering, Okayama Prefectural University, 111 Kuboki, Soja, Okayama 719-1197, Japan. fuku@c.oka-pu.ac.jp
Abstract:
We have observed lasing in a complicated eigenmode of a quasi-stadium laser diode with an unstable resonator consisting of two curved end mirrors obeying an unstable resonator condition and two straight sidewall mirrors. The laser was fabricated by application of a reactive-ion-etching technique to a molecular beam epitaxy-grown graded-index separate-confinement heterostructure single-quantum-well GaAs/AlGaAs structure. The far-field pattern shows that the lasing mode corresponds to the complicated lowest-loss mode obtained numerically by an extended Fox-Li method.