Weak index guided interband cascade laser with no top clad layer grown or with thin top clad layer

摘要

Novel ICL layering design, a ridge that will significantly reduce the optical losses and improve power conversion efficiency of interband cascade lasers designed for both DFB single mode and high power applications Waveguide architecture and processing protocol. Semiconductor top cladding and metal contact layers are eliminated or significantly reduced. Instead, by using a dielectric or air layer to supplement the dielectric or air top cladding, or a thin top cladding, in conjunction with lateral current injection and weak index guiding, the invention can It substantially reduces the internal losses of the ICL, which results in lower lasing threshold, higher efficiency and higher maximum power. [Selected figure] Figure 3C.