Population inversion in an optically pumped single quantum well

Population inversion in an optically-pumped single quantum well

An optically-pumped intersubband laser generator is proposed in which the continuum states above an A1 0.2Ga 0.8.4s GaAs A1 o2Ga o.sAs single quantum well with a width of L = 17 nm serve as the highest level in a four-level laser system. The design allows much greater flexibility in the choice of pumping source and simplifies considerabb the device fabrication. We have obtained the electronic s...

Population inversion in optically pumped asymmetric quantum well terahertz lasers

Gain Optimization in Optically Pumped AlGaAs Unipolar Quantum-Well Lasers

A method is described for the optimized design of quantum-well (QW) structures, in respect to maximizing the stimulated gain in optically pumped intersubband lasers. It relies on applying supersymmetric quantum mechanics (SUSYQM) to an initial Hamiltonian, in order to both map one bound state below the spectral range of the initial Hamiltonian, and to generate a parameter-controlled family of i...

Optically pumped laser characteristics of blue Znx8Cdy8Mg1Àx8Ày8SeÕZnxCdyMg1ÀxÀySe single quantum well lasers grown on InP

We report the operation of a photopumped blue Znx8Cdy8Mg12x82y8Se/ZnxCdyMg12x2ySe separate confinement heterostructure single quantum well laser grown lattice matched to InP with a relatively thick quaternary quantum well ~;50 Å!. Laser emission at 492 nm in the blue was observed. The lasing linewidth is about 5 nm. Based on the temperature dependency of the threshold pumping intensity, the cha...

High Sensitivity Optically Pumped Quantum Magnetometer

Quantum magnetometers based on optical pumping can achieve sensitivity as high as what SQUID-based devices can attain. In this paper, we discuss the principle of operation and the optimal design of an optically pumped quantum magnetometer. The ultimate intrinsic sensitivity is calculated showing that optimal performance of the magnetometer is attained with an optical pump power of 20 μW and an ...