Fiber Pump Semiconductor Lasers With Optical Antiguiding Layers for Horizontal Transverse Modes

Ridge-type semiconductor lasers with antiguiding cladding layers for horizontal transverse modes

“…The guiding layers, barrier layers, and active layers are all undoped to suppress internal optical loss due to free carrier absorption. It should be noted that this structure is the same as that of [12]. …”

“…Layer parameters such as band gap energy, refractive index, thickness, electron effective mass, hole effective mass, and doping concentration are the same as those in [12]. The refractive index and thickness are as follows: The refractive index and thickness of the n-GaAs substrate are 3.54 and 100 μm, respectively.…”

“…Physical parameters and their numerical values, which are used in the simulation, are the same as those in [12]. It is assumed that distributions of light and carriers are uniform along the cavity axis, thermal effects are not included, and temperature is 300 K. Fig.…”

“…[10] However, thick cladding layer at both sides of the mesa necessarily leads to an increase in threshold current due to lateral expansion of injected current. [11] To overcome this problem, a novel ridge structure with antiguiding layers has been recently proposed [12], but it is considered that the fabricating process is relatively complicated.…”

Ridge-Type Semiconductor Lasers with Optical Antiguiding Layers for Horizontal Transverse Modes: Dependence on Step Positions

“…10) To overcome this problem, a novel ridge structure with optical antiguiding layers has been recently proposed by the authors. 11) In this study, the dependence of the lasing characteristics of the novel ridge structure with steps in the optical guiding layers on step position is theoretically investigated. It is found that steps in both the upper guiding layer, which is adjacent to the p-cladding layer, and the lower guiding layer, which is adjacent to the n-cladding layer, increase kink level and the contribution of the steps in the upper guiding layer is higher than that of the steps in the lower guiding layer.…”