Carrier dynamics and gain saturation in quantum-well lasers

Gain saturation and carrier distribution effects in molecular beam epitaxy grown GaAsSb/GaAs quantum well lasers

GaAsSb/GaAs quantum well QW lasers grown by solid source molecular beam epitaxy are fabricated into ridge lasers and tested. These devices have a lasing wavelength around 1.2 m that is substantially blueshifted relative to the electroluminescence peak. The magnitude of the blueshift increases as the cavity length is shortened, indicating that the blueshift increases with injection level. This b...

Carrier Dynamics in Quantum Cascade Lasers

A fully quantum-mechanical model for carrier scattering transport in semiconductor intersubband devices was applied to modelling of carrier dynamics in quantum cascade lasers. The standard model uses the envelope function and effective mass approximations to solve electron band structure under an applied bias. The k ·p model has been employed in p-type systems where the more complex band struct...

Carrier dynamics and saturation effect in (113)B InAs/InP quantum dot lasers

Quantum dot (QD) lasers exhibit many interesting and useful properties such as low threshold current, temperature insensitivity or chirpless behavior. In order to reach the standards of long-haul optical transmissions, 1.55 μm InAs QD lasers on InP substrate have been developed. Based on time resolved photoluminescence (PL) measurements, carrier dynamics behavior is at first investigated. Elect...

Carrier Lifetime and Recombination in Long-Wavelength Quantum-Well Lasers

We present a novel analysis for correcting the measured differential carrier lifetime to account for carrier population in both the barrier and separate confinement heterostructure (SCH) regions of quantum-well (QW) lasers. This analysis uses information obtained from the measured spontaneous emission spectra to correct the measured lifetime and obtain the intrinsic well lifetime. Once the intr...

Femtosecond pump-probe studies of carrier transport and gain dynamics in quantum cascade lasers