Pulsed and CW performance of 7-stage interband cascade lasers.
We report a narrow-ridge interband cascade laser emitting at λ ≈3.5 μm that produces up to 592 mW of cw power with a wallplug efficiency of 10.1% and beam quality factor of M(2) = 3.7 at T = 25 °C. A pulsed cavity length study of broad-area lasers from the same wafer confirms that the 7-stage structure with thicker separate confinement layers has a reduced internal loss of ≈3 cm(-1). More generally, devices from a large number of wafers with similar 7-stage designs and wavelengths spanning 2.95-4.7 μm exhibit consistently higher pulsed external differential quantum efficiencies than earlier state-of-the-art ICLs.
Chadwick L
CL
Canedy
Joshua
J
Abell
Charles D
CD
Merritt
William W
WW
Bewley
Chul Soo
CS
Kim
Mijin
M
Kim
Igor
I
Vurgaftman
Jerry R
JR
Meyer