Temperature control circuit based on thermoelectric cooler and quantum cascade laser employing temperature control circuit

Abstract

A temperature control circuit based on a thermoelectric cooler, comprising: a temperature acquisition module, configured to detect the temperature of an area to be detected and output a temperature signal; a controller, configured to control the temperature according to the temperature signal input by the temperature acquisition module. thermoelectric cooler for control; and thermoelectric cooler for cooling. And a quantum cascade laser using it. The temperature control accuracy of the temperature control circuit of the present invention is less than or equal to 0.1°C. With a small air cooling device, it can replace the traditional water cooling system, realize the stable temperature control of the quantum cascade laser at room temperature, greatly reduce the volume of the cooling system, and at the same time, there is no mechanical Vibration is conducive to the stable operation of the system; in addition, the temperature control circuit is small in size, easy to install, long in service life, easy to operate, and has no noise, especially suitable for temperature control of portable laser systems.

Description

technical field [0001] The invention belongs to the field of semiconductor devices and electronic circuits, and more specifically relates to a temperature control circuit of a quantum cascade laser (QCL), especially a temperature control circuit based on a thermoelectric cooler (TEC) and a quantum level control circuit using it. connected lasers. Background technique [0002] Quantum cascade lasers have a wide range of applications in gas detection, drug and explosive detection, air pollution monitoring, infrared countermeasures, and terahertz imaging. Because the quantum cascade laser is different from the general semiconductor laser, its driving voltage is higher (generally above 10V), the threshold current is larger (hundreds of mA to above 1A), and because of its low conversion efficiency (about 10%), Therefore, the heat generation is large, and the stability of temperature control is required to be high. Generally, quantum cascade lasers use a water-cooled system, but...

AI Technical Summary

Problems solved by technology

Because the quantum cascade laser is different from the general semiconductor laser, its driving voltage is higher (generally above 10V), the threshold current is larger (hundreds of mA to above 1A), and because of its low conversion efficiency (about 10%), Therefore, the heat generation is large, and the stability of temperature control is required to be high.

Usually quantum cascade lasers use a water-cooled system, but due to its large size, complex structure, and accompanying mechanical vibration and noise, it is difficult to realize the portable application of quantum cascade lasers

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