Abstract
High-power broad area substrate emitting photonic-crystal distributed feedback (DFB) quantum cascade lasers (QCLs) emitting around 4.73 μm is reported. Two-dimensional centered rectangular photonic-crystal (CRPC) grating is introduced to enhance optical coherence in large area device. Main lobe far-field radiation pattern with a very small divergence angle of about 0.65° × 0.31° is obtained. A record peak output power for vertical emitting QCLs exceeding 10 W is obtained with high reflectivity (HR) coating. Robust single longitudinal mode emission with a side mode suppression ratio (SMSR) of 30 dB is continuously tunable by the heat sink temperature up to 65°C.
Highlights
Recent successive performance breakthroughs of vertical emitting quantum cascade lasers (QCLs) [1,2,3,4] have aroused more attention and further research into this field
The previous reported vertical emitting QCLs [7,8,9] were limited to pulsed mode operation with output power below 1 W
We present a promising approach based on 2D centered rectangular photonic-crystal (CRPC) theory to fabricate broad area substrate emitting midinfrared quantum cascade laser
Summary
Recent successive performance breakthroughs of vertical emitting quantum cascade lasers (QCLs) [1,2,3,4] have aroused more attention and further research into this field. The previous reported vertical emitting QCLs [7,8,9] were limited to pulsed mode operation with output power below 1 W. With the advent of epilayer-down bonding technology for substrate emitting quantum cascade lasers (a kind of vertical emitting laser with light out from the substrate side, SE-QCLs) [10], continuous wave (CW) operations were demonstrated with second-order distributed feedback (DFB) grating stripe [11,12] and ring [13] cavity laser. Experiments [14] have verified the
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