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Proceedings Paper

Effect of optical waveguiding mechanism on the lasing action of chirped InAs/AlGaInAs/InP quantum dash lasers
Author(s): M. Z. M. Khan; Tien K. Ng; C.-S. Lee; P. Bhattacharya; Boon S. Ooi
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Paper Abstract

We report on the atypical emission dynamics of InAs/AlGaInAs/InP quantum dash (Qdash) lasers employing varying AlGaInAs barrier thickness (multilayer-chirped structure). The analysis is carried out via fabry-perot (FP) ridge (RW) and stripe waveguide (SW) laser characterization corresponding to the index and gain guided waveguiding mechanisms, respectively, and at different current pulse width operations. The laser emissions are found to emerge from the size dispersion of the Qdash ensembles across the four Qdash-barrier stacks, and governed by their overlapping quasi-zero dimensional density of states (DOS). The spectral characteristics demonstrated prominent dependence on the waveguiding mechanism at quasi-continuous wave (QCW) operation (long pulse width). The RW geometry showed unusual spectral split in the emission spectra on increasing current injection while the SW geometry showed typical broadening of lasing spectra. These effects were attributed to the highly inhomogeneous active region, the nonequilibrium carrier distribution and the energy exchange between Qdash groups across the Qdash-barrier stacks. Furthermore, QCW operation showed a progressive red shift of emission spectra with injection current, resulted from active region heating and carrier depopulation, which was observed to be minimal in the short pulse width (SPW) operation. Our investigation sheds light on the device physics of chirped Qdash laser structure and provides guidelines for further optimization in obtaining broad-gain laser diodes.

Paper Details

Date Published: 4 March 2013
PDF: 6 pages
Proc. SPIE 8640, Novel In-Plane Semiconductor Lasers XII, 864005 (4 March 2013); doi: 10.1117/12.2003462
Show Author Affiliations
M. Z. M. Khan, King Abdullah Univ. of Science and Technology (Saudi Arabia)
Tien K. Ng, King Abdullah Univ. of Science and Technology (Saudi Arabia)
C.-S. Lee, Univ. of Michigan (United States)
P. Bhattacharya, Univ. of Michigan (United States)
Boon S. Ooi, King Abdullah Univ. of Science and Technology (Saudi Arabia)


Published in SPIE Proceedings Vol. 8640:
Novel In-Plane Semiconductor Lasers XII
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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