Related Experiment Video
Updated: Feb 2, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
Low voltage-defect quantum cascade lasers based on excited-states injection at λ ∼ 8.5 μm
Abstract:
A quantum cascade laser emitting at λ∼8.5 μm based on the excited-state injection is presented. The operating voltage is reduced for a low-voltage defect in the excited-state design, compared with the conventional ground-state injection design. The threshold voltage and voltage defect are as low as 6.3 V and 54 mV for a 30-stage active region, respectively. Devices were fabricated through standard buried-heterostructure processing to decrease the heat accumulation. A continuous-wave optical power of 340 mW is obtained at 283 K with a threshold current density of 2.7 kA/cm2. Such a design has the potential to further improve the wall plug efficiency for increased voltage efficiency.
Related Concept Videos
Quantum Numbers
Intracellular Signaling Cascades
The Quantum-Mechanical Model of an Atom
Rab Cascades
Voltage
Amplifying Signals via Enzymatic Cascade

