Emulation of the operation and degradation of high-power laser bars using simulation tools

Abstract

We report on the simulation of high-power laser bars and the emulation of their ageing behaviour, using simulation tools originally developed for single emitter laser diodes. Simulations of a simplified bar indicated that the hotter emitters located at the centre of the bar emit more power than their cooler neighbours, while degradation emulations showed that the centre emitters degrade faster. Although the degraded emitters produced less light, they drew an increasingly large fraction of the total current. These insights into the operation and degradation of the bar motivated new experimental investigations, which confirmed the predicted behaviour.

Simulation of high-brightness diode lasers with optical feedback from modules and systems

“…Barlase is based on multiple, coupled instances of Speclase. It is able to simulate an entire array of lasers, including the current competition between the individual laser emitters and the thermal crosstalk between them [4].…”

“…While some reflections at the emitter level may be part of the required feedback, parasitic reflections at the system level must also be considered. Finally, external feedback also affects the degradation of high-power laser bars [3,4]. In this work, we seek to simulate the effects of these reflections by coupling a commercial optical modelling tool (Zemax) to a physics-based simulation tool for laser diodes and bars [1,4].…”

Degree of Polarization of Cathodoluminescence from a (100) GaAs Substrate with SiN Stripes

“…[7]. Laser emitters in regions of appreciable shear have been shown to emit less power than emitters in the center of the chip, where the shear strain is zero or small [13][14][15][16][17][18]. This reduction in power for emitters in regions of appreciable shear strain can be explained by birefringence owing to the presence of shear strain [7,[17][18][19].…”

Thermal analysis and package optimization for the multi-wavelength laser bar module

“…High chip temperature will directly lead to the decline of semiconductor laser lifetime and reliability, even damaging the chip. Therefore, the thermal characteristics become a key factor restricting the further improvement of the performance of semiconductor multi-wavelength modules [8][9][10] . At present, the research focus of semiconductor laser thermal management at home and abroad mainly focuses on the form of a single-wavelength single tube, bar array, etc., while the lack of comprehensive analysis of thermal characteristics of multi-wavelength modules with different wavelengths.…”