Self-consistent far-field blooming analysis for high-power Fabry-Perot laser diodes

Inverse Thermal Lens Effects on the Far-Field Blooming of Broad Area Laser Diodes

“…4 is mainly caused by the rising order of lateral lasing modes, each current step turns on an additional mode of higher order. Simultaneously, the fundamental mode is weakened by the increasing mode competition and by current crowding near the contact edges, which provides more gain to higher-order modes [3]. These findings are in good agreement with the experimental investigation of lateral modes [1], [4].…”

“…Numerical simulation is a valuable tool to study this complex interaction of electronic, thermal, and optical processes. Previously, we published selfconsistent electro-thermal-optical simulations of the far-field blooming for a distributed feedback laser [2] and for a Fabry-Perot laser, [3] for which the simulated changes of laser power ( Fig. 1), bias, wavelength, number of lateral modes, near field width, and far field angle with increasing current are all in good agreement with earlier measurements [1], [4].…”

“…In the following, we use the previously studied Fabry-Perot laser [3] as an example to analyze the effects of pedestal heat sinking. The GaAs-based laser diode features a compressively strained double quantum well (QW) InGaAs/GaAsP active region that is sandwiched between AlGaAs waveguide and cladding layers [1], [4].…”

“…The heat power distribution is calculated using the local densities of carriers and current. Joule heat, non-radiative recombination heat inside the quantum wells, and heat caused by modal absorption were identified as main heat sources [3]. Besides the laser chip, the 1041-1135/$31.00 © 2013 IEEE simulation domain also includes the submount to accurately calculate the temperature profile T(x,y).…”

“…The modal far-fields are obtained from the Fourier transform of the modal near-field at the laser facet [9]. Further details on models and parameters are given elsewhere [3], [10].…”