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Spatial hole burning in actively mode-locked quantum cascade lasers
(Institute of Electrical and Electronics Engineers, 2009-08)
A theoretical study of active mode-locking in quantum cascade lasers including spatial hole-burning is presented. It is found that spatial hole-burning reduces the pulse duration at the expense of slight pulse instability ...
Low-threshold terahertz quantum-cascade lasers with one-well injector operating up to 174 K
(Institute of Electrical and Electronics Engineers, 2009-08)
We report operation of v ~ 2.7 THz quantum-cascade lasers (QCLs) up to 174 K. A new three-well active region, one-well injector scheme is utilized to lower the operating current densities. While the temperature performance ...
Mode-locking via active gain modulation in quantum cascade lasers
(Institute of Electrical and Electronics Engineers, 2009-06)
A mode-locking mechanism by active gain modulation is studied numerically and experimentally. The parameter window for the emission of stable pulse trains was found. Pulses as short as 3 ps (~0.5 pJ) were characterized by ...