High-stability laser pumping source with overtemperature protection function

Abstract

The invention discloses a high-stability laser pumping source with an overtemperature protection function and belongs to the technical field electronic equipment. The laser pumping source structurally comprises a laser module (1), a power control module (2) and a temperature control module (3). The laser pumping source is characterized by further comprising a display driving module (3) structurally, and the power control module (2) is composed of a power setting module (21), a power sampling module (22), a PID operation module (23), an LD driving module (24), an overtemperature processing module (25) and a soft starting module (26). The laser pumping source is high in stability and has the functions of overtemperature alarming power-off and soft starting.

Description

technical field [0001] The invention belongs to the technical field of electronic equipment, in particular to a high-stability laser pumping source device with an over-temperature protection function. 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 i...

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Problems solved by technology

[0003] In the fiber laser, a laser 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 various laser generating circuits , the system composed of a butterfly laser module, a current driver, and a temperature controller is widely used due to its advantages of convenient use, rich functions, high stability, and easy integration. In 2014, the invention patent "a high stability fiber laser pump source" was applied, the application number is 2014103102505. In this document, the butterfly laser module is used as the light source, and the constant current driver and the constant temperature controller with high stability are used. To drive and control the temperature, in addition to the temperature control of the butterfly laser module, the temperature control of other nuclear devices in the system is also carried out, which effectively improves the stability of the output laser, but this technology still has certain 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 Accurately and quickly keep up with changes in electrical signals, or when changing the driving current, the output optical power will oscillate near the target power; Second, there is no over-temperature protection measure in the system, once the heat generated by the butterfly laser module exceeds the temperature controller When the temperature control capability of the laser is high or the temperature controller fails, the temperature of the laser will rise sharply, and it is easy to burn out the butterfly laser module

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