Abstract
We report a sub-250-nm, optically pumped, deep-ultraviolet laser using an Al x Ga 1-x N-based multi-quantum-well structure grown on a bulk Al-polar c-plane AlN substrate. TE-polarization-dominant lasing action was observed at room temperature with a threshold pumping power density of 250 kW/cm 2 . After employing high-reflectivity SiO 2 /HfO 2 dielectric mirrors on both facets, the threshold pumping power density was further reduced to 180 kW/cm 2 . The internal loss and threshold modal gain can be calculated as 2 cm -1 and 10.9 cm -1 , respectively.
Original language | English (US) |
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Article number | 211103 |
Journal | Applied Physics Letters |
Volume | 103 |
Issue number | 21 |
DOIs | |
State | Published - Nov 18 2013 |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)