Extremely small vertical far-field angle of InGaAs-AlGaAs quantum-well lasers with specially designed cladding structure

Kuo-Jui Lin*, Shun-Tung Yen, Chien Ping Lee, Der Cherng Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

We report on a very small vertical far-field angle achieved by lasers with a specially designed structure. For an InGaAs-AlGaAs quantum-well laser with a 2.5-μm-wide ridge waveguide, the far-field pattern has a vertical far-field angle of 13° and a lateral far-field angle of 8°. Meanwhile, the threshold current remains acceptably low (≈36 mA for a 500-μm-long cavity). The slope efficiency of the L-I characteristic is high (>0.9 W/A) compared to that of the conventional laser.

Original languageEnglish
Pages (from-to)1588-1590
Number of pages3
JournalIEEE Photonics Technology Letters
Volume8
Issue number12
DOIs
StatePublished - Dec 1996

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