Drive and temperature control circuit of quantum cascade laser

Abstract

The invention relates to a drive and temperature control circuit of a quantum cascade laser, which belongs to the technical field of electrons. The drive and temperature control circuit is used for supplying accurate and adjustable pulse width modulation (PWM) drive voltage to the quantum cascade laser and for precisely controlling the working environment temperature of the quantum cascade laser. The drive and temperature control circuit comprises a single chip microprocessor, an adjustable voltage stabilizing source, a temperature control module, a PWM control module and a load protection module. The drive and temperature control circuit is simple in design and convenient to use; the work status of the laser load can be comprehensively monitored, an over-current protection function is realized, high-voltage breakdown is prevented, the pulse width adjustability is good, the pulse width can be minimized to ns grade, adjustable pulse width and adjustable working frequency can be realized, stable working temperature is achieved, and laser generated by the quantum cascade laser which is sensitive to the ambient temperature can be maintained at constant optical wavelength.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a driving circuit of a quantum cascade laser (QCL) for generating precise and adjustable narrow pulse signals and a temperature control circuit with adjustable temperature. technical background [0002] Quantum cascade laser (QCL) is a new type of unipolar semiconductor device based on the transition of electrons between conduction band and subband in semiconductor quantum wells and the principle of phonon-assisted resonant tunneling. Different from the electron-hole recombination stimulated emission mechanism of traditional p-n junction semiconductor lasers, only electrons participate in the stimulated emission process of QCL, and the selection of lasing wavelength can be realized by the energy band cutting of the potential well and barrier in the active region. It is an ideal light source for gas monitoring and free space communication. It has wide application ...

AI Technical Summary

Problems solved by technology

Since the traditional three-terminal adjustable voltage regulator output circuit module uses a variable resistor with low precision and large volume, the precision of the output voltage Vout is low and cannot meet the application requirements of high precision.

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