Passively Mode-Locked 2.7 and 3.2 μm GaSb-Based Cascade Diode Lasers

The passively mode-locked type-I quantum well cascade diode lasers operating near 2.7 and 3.2 μm generated trains of the ~10 ps long pulses with average power up to 10 mW. The devices based on laser heterostructures with reinforced carrier confinement requires increased reverse bias voltages applied...

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Bibliographic Details
Published in:Journal of lightwave technology 2020-04, Vol.38 (7), p.1895-1899
Main Authors: Feng, T., Shterengas, L., Hosoda, T., Kipshidze, G., Belyanin, A., Teng, C.C., Westberg, J., Wysocki, G., Belenky, G.
Format: Article
Language:English
Subjects:
Cascade lasers
Emission spectra
Feedback
Gas lasers
GaSb
Heterostructures
Intermodal
Laser mode locking
Lasers
Measurement by laser beam
mode-locked lasers
optical frequency comb
Quantum cascade lasers
Quantum wells
Radio frequency
Semiconductor lasers
Waveguide lasers
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Summary:The passively mode-locked type-I quantum well cascade diode lasers operating near 2.7 and 3.2 μm generated trains of the ~10 ps long pulses with average power up to 10 mW. The devices based on laser heterostructures with reinforced carrier confinement requires increased reverse bias voltages applied to absorber sections to operate in mode-locked regime. The autocorrelation measurements showed that lasers generated strongly chirped pulses with temporal width an order of magnitude above transform limit. The application of the external feedback led to narrowing of the laser emission spectra accompanied by an order of magnitude reduction of the intermodal beat note linewidth. The multiheterodyne beat notes have been observed for devices stabilized by external feedback.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2020.2971605