High stability laser generating circuit based on PID control

Abstract

The invention provides a high stability laser generating circuit based on PID control, belonging to the electronic equipment technical field. The high stability laser generating circuit comprises a laser module (1), a power control module (2) and a temperature control module (3), and is characterized in that the power control module (2) is composed of a power setting module (21), a power sampling module (22), a PID calculation module (23), an LD driving module (24) and an overtemperature power off module (25). The high stability laser generating circuit has high stability, and is provided with an overtemperature power off function.

Description

technical field [0001] The invention belongs to the technical field of electronic equipment, in particular to a high-stability laser generating circuit based on PID control. Background technique [0002] With its low threshold, high power, high beam quality, good reliability, compact structure and good heat dissipation, fiber lasers are widely used in laser fiber communication, laser space long-distance communication, industrial shipbuilding, automobile manufacturing, laser engraving, Laser marking, laser cutting, printing roll, metal and non-metal drilling / cutting / welding (brazing, quenching, cladding and deep welding), military defense security, medical equipment and other fields. A fiber laser is a laser that uses a rare earth-doped fiber as a gain medium. Fiber lasers are developed on the basis of fiber amplifiers and are composed of three basic elements: pump source, rare earth element-doped fiber, and resonant cavity. The working principle is: the photons at the pump ...

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Problems solved by technology

[0003] In the fiber laser, a laser generating circuit (pump source) must provide the energy source for the entire fiber laser. As the core part of the fiber laser, the main technical index of the pump source is the stability of the output laser. In the laser generating circuit, the system composed of butterfly laser module, current driver and temperature controller is widely used due to its advantages of convenient use, rich functions, high stability and easy integration. The prior art closest to the present invention is In 2014, our research group applied for the invention patent "a high-stability fiber laser pump source", the application number is 2014103102505. In this document, the butterfly laser module is used as the light source, and the constant current driver with high stability is used. It is driven and controlled by a constant temperature controller. In addition to controlling the temperature of the butterfly laser module, it also controls the temperature of other nuclear devices in the system, which effectively improves the stability of the output laser. However, this technology still has certain limitations. Defects: 1. The driver adopts an ordinary linear proportional control method, and the butterfly laser module is an electro-optical conversion device. During the conversion process, the output optical signal and the input electrical signal will inevitably be delayed. When the power needs to be changed frequently, The output power will not be able to keep up with the changes of the electrical signal accurately and quickly, or when the driving current is changed, the output optical power will oscillate near the target power; 2. There is no over-temperature protection measure in the system, once the heat generated by the butterfly laser module When the temperature control capability of the thermostat is exceeded or the thermostat fails, the temperature of the laser will rise sharply, which will easily burn out the butterfly laser module

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