A Frequency Precisely Adjustable Pulse Generation Circuit for Semiconductor Laser

Abstract

The invention discloses a frequency precision adjustable pulse generation circuit for a semiconductor laser. The frequency precision adjustable pulse generation circuit comprises a microcontroller, aDDS module and an avalanche transistor pulse generation circuit. The microcontroller is connected with the DDS module. The DDS module is connected with the avalanche transistor pulse generation circuit. The DDS module serves as a trigger signal, and the avalanche transistor pulse generation circuit receives the trigger signal so as to excite a capacitor to generate a pulse signal. According to theinvention, the microcontroller is used to write different frequency control words to an AD9851 chip in the DDS module through Keil software and STC-ISP software, so as to generate different frequencies as trigger signals to be provided to the avalanche transistor pulse generation circuit of the latter stage, and thus, the pulse signals of different frequencies are obtained. The adjustable frequency range is 0 to 60 MHz, the pulse width can also be adjusted by changing the supply voltage, and easy application to the driving of the semiconductor laser can be realized.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a frequency precision adjustable pulse generating circuit for semiconductor lasers. Background technique [0002] In modern science and technology, semiconductor lasers have developed increasingly mature, and among them, semiconductor lasers are mainly pulsed lasers, which are small in size and long in life, and can be pumped by simple injection current. Electrically compatible with integrated circuits and thus monolithically integrated with them. Moreover, current modulation can be directly performed at different frequencies to obtain laser pulse outputs modulated at different frequencies. It has been widely used in laser communication, optical storage, optical gyroscope, laser printing, ranging and radar. Therefore, it is of great significance to study the pulse generation circuit with continuously adjustable frequency. [0003] The commonly used frequency adjustable met...

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Problems solved by technology

But if you want to get a precise frequency accurate to Hz, analog adjustment becomes difficult to achieve

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