Semiconductor laser driving current control method and multi-mode working driving power supply

Abstract

Driving current value needed is obtained through experiment testing calibration method for semiconductor laser to reach certain output power under different temperatures so as to get coincidence relation between temperature and driving current value. The said coincidence relation in list form is inputted into microprocessor by using keyboard input unit. Based on detected operating temperature of LD, changing driving current compensates variation of output power caused by changing temperature in order to realize stable LD output power. The invention also discloses driving power for semiconductor laser operated based on multiple modes in order to realize the disclosed method. The invention is applicable to diversified areas of semiconductor laser being as light source or pump source.

Description

technical field [0001] The invention belongs to the technical field of semiconductor lasers, and in particular relates to a control method of a driving current of a semiconductor laser and a structural design of a driving power supply for a semiconductor laser or a semiconductor laser array. Background technique [0002] Semiconductor lasers (LD for short) or semiconductor laser arrays (LD array for short) are small in size, light in weight, high in efficiency and good in reliability, and have been used more and more widely. The principle is to rely on the radiative recombination of injected non-equilibrium carriers (electrons, holes), and release the energy generated by the recombination in the form of photons to emit laser light. The non-equilibrium carriers of the semiconductor laser are injected by its driving power supply. [0003] The function of the semiconductor laser drive power supply (LD drive power supply for short) is to provide the required drive current for t...

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Problems solved by technology

[0011] In order to overcome the defect in the prior art that the traditional semiconductor laser drive power supply cannot guarantee the stability of the output optical power without temperature control, or has to add a complex and energy-consuming temperature control system to ensure the stability of the output optical power; To overcome the shortcomings of the optical power source controller proposed by Regev et al., the algorithm is complex, the reliability is not high, the working mode is single, and it is inconvenient to modify the relationship list between the working parameters of the semiconductor laser and the driving current, the present invention proposes a method of driving the current of the semiconductor laser The control method is characterized in that: the output characteristics of the semiconductor laser at different temperatures are obtained by using the experimental test calibration method, that is, the required driving current value for the semiconductor laser to reach a certain output power, thereby obtaining the temperature and the driving current value. One-to-one correspondence, the above correspondence is input into the microcontroller in the form of a list through the keyboard input unit; the temperature sensor is used to monitor the working temperature of the semiconductor laser in real time, and the corresponding driving current value is determined according to the above correspondence, and the semiconductor laser drive power supply automatically Adaptively output this current to ensure that the semiconductor laser has a stable output power at different temperatures

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