Abstract
This article proposes a modelling method for laser diodes optical output power including its dependency on temperature. The device used for this study is a 40 W Monocrom’s diode, with 808 nm wavelength emitted light and with a 19 emitters CS mount laser bar, mounted using the patented Monocrom’s clamping method. The aim of this study is to propose a Pspice modelling of the laser diode device, mainly focusing in the optical output power variation with the temperature and allowing its computer simulation. Also to setup a characterization system to obtain the necessary parameters values for the optical model mathematical expressions. Therefore, the article explains the proposed method for the optical output power model generation of the laser bar diode and how its parameters values are obtained, an optical output power measurement setup and its calibration, the obtained Pspice model and its simulation, and the characterization system that allows to obtain the necessary parameters with short rise up time current slopes. Finally, evaluation of results and related conclusions are exposed.
Highlights
A Pspice or any other modelling method allowing computer simulation of the optical output power of a laser diode device in its control driver, including its dependency on temperature, is useful because laser diode devices increase temperature during the laser effect provoking the decrease of the optical output power and its efficiency
The hypothesis about the optical power slope efficiency variation with temperature and the existing theory of the threshold current dependency on the temperature, both used in the mathematical modelling, have been confirmed with measured results in a climatic chamber
Modelling method and related Pspice program have been implemented in a 40 W, 808 nm laser bar diode, and its simulation results are obtained in the devices operational temperature range
Summary
A Pspice or any other modelling method allowing computer simulation of the optical output power of a laser diode device in its control driver, including its dependency on temperature, is useful because laser diode devices increase temperature during the laser effect provoking the decrease of the optical output power and its efficiency. In those industrial applications where the optical output power need to be constant different methods are used to achieve this purpose, either keeping the temperature constant or readjusting the laser diode current with photodiodes based feedback circuits [10]. The novelties of this work are the optical output power modelling proposal considering temperature variations, which includes the mathematical model and related hypothesis validation, the proposed Pspice optical power modelling schema and the characterization system for temperature dependent parameters measurement
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