Semiconductor laser and its temperature control method

Abstract

A semiconductor laser and a temperature control method therefor, comprising: firstly collecting the temperature and humidity of an external environment of a semiconductor laser or the temperature and humidity in an accommodating cavity body (311); then according to the collected temperature and humidity, determining a working case temperature which can prevent a water vapor condensation phenomenon, so as to adjust a temperature control point according to the determined working case temperature; and according to a function relationship between an input current and the working case temperature and output light power of the laser, calculating the input current corresponding to the present working case temperature and adjusting same under the precondition of ensuring that the output light power of the laser is roughly stable. According to the temperature control method, by monitoring a change in the temperature and humidity of an environment / cavity body, a working case temperature and a power supply current of a laser is adjusted in real time, both preventing water vapor condensation and ensuring stable output light power.

Description

technical field [0001] The present application relates to semiconductor lasers, in particular to a temperature control method in semiconductor lasers. Background technique [0002] Laser light sources have the advantages of high brightness, wide color gamut, good reliability, energy saving and environmental protection, and are more and more widely used in various projection devices. Semiconductor lasers are commonly used as laser light sources, and their electro-optical conversion efficiency and reliability are closely related to the working shell temperature of the laser. For example, when the shell temperature of a red laser diode is 25°C, the input current is 3A, and the laser can output 2.5W red light; when the shell temperature is 35°C, the same output is 2.5W red light, and the input current needs to reach 3.75A, that is, the input power needs to be increased at least 25%. Therefore, for this type of semiconductor laser, in order to obtain better electro-optical effi...

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Problems solved by technology

However, there are the following problems that are difficult to solve: First, the working shell temperature of the laser is lower than the ambient temperature. When the ambient humidity is high, the water vapor in the air will condense on the surface of the TEC cold end and other surfaces whose temperature is lower than the ambient temperature, which may lead to a drop in optical power. , short circuit, damaged optical parts and other product failures seriously affect the reliability of the projection device; second, as the ambient temperature rises, the temperature difference between the hot and cold ends of the TEC increases, and the cooling efficiency COP of the TEC drops rapidly, resulting in a breakdown of the projection device. Efficiency drops

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