Ring cavity induced threshold reduction in single-mode surface emitting quantum cascade lasers

Mujagić, Elvis; Nobile, Michele; Detz, Hermann; Schrenk, Werner; Chen, Jianxin; Gmachl, Claire; Strasser, Gottfried

doi:doi:10.1063/1.3292021

Volume/Page
Keyword
DOI
Citation
Advanced

Volume: Page/Article:

Search Content Type

article doi:

Citation:

Density-dependent carrier dynamics in a quantum dots-in-a-well heterostructure

The incorporation of semiconductor quantum dots into different heterostructures for applications in nanoscale lasing and amplification has been an active area of research in recent years. Here, we use ultrafast differential transmission spectroscopy to temporally and spectrally resolve density-dependent carrier dynamics in a quantum dots-in-a-well (DWELL) heterostructure. We observe excitation-dependent shifts of the quantum dot energy levels at low densities, while at high densities we observe...

Mode locking of an external-cavity bisection GaInN blue-violet laser diode producing 3 ps duration optical pulses

Passive mode locking of a bisectional GaInN quantum well laser diode was confirmed with external-cavity geometry. Optical pulses of 3 ps duration were produced by controlling the reverse-bias voltage applied to a saturable absorber section. These are the shortest optical pulses ever generated from GaN-based laser diodes.

We present ring cavity surface emitting (RCSE) quantum cascade lasers operating at temperatures as high as 380 K and above. A reduction in threshold current density and enhanced radiation efficiency are observed as compared to Fabry–Pérot (FP) lasers. In continuous wave, the maximum operation temperature of RCSE lasers is 50 K higher than in FP emitters. The devices exhibit single-mode emission at a wavelength around 8 μm with a side mode suppression ratio of 30 dB at room temperature. A lithographic tuning of the resonance is achieved by a variation in the grating period. The emitters exhibit a low divergent ring-shaped beam pattern with a lobe separation of ∼ 1.5°.

RELATED DATABASES

To view database links for this article, you need to log in.

KEYWORDS and PACS

Keywords

diffraction gratings, laser cavity resonators, quantum cascade lasers, ring lasers, surface emitting lasers

PACS

42.55.Px

Semiconductor lasers; laser diodes
42.79.Dj

Gratings
42.60.Da

Resonators, cavities, amplifiers, arrays, and rings

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3292021

PUBLICATION DATA

ISSN

0003-6951 (print)

1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef

American Institute of Physics

For access to citing articles, you need to log in.

Figures (4)

Access to article objects (figures, tables, multimedia) requires a subscription; log in to view available files.
(Access to supplementary files, where available, is free for this journal.)