Interband cascade lasers with room temperature threshold current densities below 100 A/cm2

Temperature Effect on THz Quantum Cascade Lasers

A simple semi-phenomenological model, which accurately predicts the dependence of thresholdcurrent for temperature of Resonant-phonon three well quantum cascade laser based on verticaltransitions is offered. We found that, the longitude optical phonon scattering of thermally excitedelectrons is the most important limiting factor for thermal performance of high frequency THz QCLs.In low frequenc...

Direct liquid cooling of room-temperature operated quantum cascade lasers

A compact packaging module for direct liquid cooling of roomtemperature quantum cascade lasers is implemented. The light was coupled out of the hermetically sealed package through a mid-infrared fibre epoxy-bonded to the laser. The threshold current reduces by 10%, compared to convectional substrate-side cooled lasers when using low boiling temperature (boiling point (b.p.)1⁄4 34 C) 3M HFE7000 ...

Extremely low room-temperature threshold current density diode lasers using InAs dots in In0.15Ga0.85As quantum well

Introduction: It has been predicted that the threshold current density of quantum dot lasers should be lower than that of quantum well lasers due to the reduction of density of states [1]. In particular, efforts have been made in the past few years to reduce the threshold current density of quantum dot lasers on GaAs substrates [2, 3]. A recently developed approach is to put the InAs dots in a ...

Demonstration of the self-mixing effect in interband cascade lasers

Analysis of the temperature performance of type-II interband cascade lasers

The temperature performance of type-II semiconductor lasers has been analyzed by comparing the temperature-concentration dependence for a charge-carrier subsystem at the threshold with steady-state temperature-concentration relationship implied by the carrier heating process. The low material gain characteristic of type-II heterostructures and the high resistance of the thermal link to the heat...