Abstract
We demonstrate electrically pumped, room temperature, single mode operation of photonic crystal distributed feedback (PCDFB) quantum cascade lasers emitting at λ∼4.75 μm. Ridge waveguides of 100 μm width were fabricated with both PCDFB and Fabry-Ṕrot feedback mechanisms. The Fabry-Ṕrot device has a broad emitting spectrum and a double lobed far-field character. The PCDFB device, as expected, has primarily a single spectral mode and a diffraction limited far field characteristic with a full angular width at half maximum of 2.4°. This accomplishment represents the first step in power scaling of single mode, midinfrared laser diodes operating at room temperature.
Original language | English (US) |
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Article number | 141123 |
Journal | Applied Physics Letters |
Volume | 91 |
Issue number | 14 |
DOIs | |
State | Published - 2007 |
Funding
The authors would like to acknowledge the support, interest, and encouragement of J. Meyer from Naval Research Laboratory, M. Gross from Office of Naval Research, and H. Temkin and M. Rosker from Defense Advanced Research Projects Agency.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)