阅读说明：本技术 一种实现激光器稳定输出的方法及激光器系统 (Method for realizing stable output of laser and laser system ) 是由 杨直 赵卫 杨小君 王屹山 李强龙 于 2020-03-27 设计创作，主要内容包括：本发明公开了一种实现激光器稳定输出的方法及激光器系统。本发明通过测量和分析计算激光器内部各个发热元器件的发热情况,仿真模拟激光器最佳工作状态时所需要保持的制冷量,对激光器内部各个发热元器件实时进行温度探测,同时根据对比探测到的实时温度与最优化制冷方案中的温度,及时修正冷却方案中激光器内部各个发热元器件的制冷量,以达到从全局域出发,最终实现激光器光机热平衡的目的。使得激光器具有较强的环境自适应能力、输出光束质量好、长时间工作稳定性优异的产品性能。(The invention discloses a method for realizing stable output of a laser and a laser system. The invention calculates the heating condition of each heating component in the laser through measurement and analysis, simulates the refrigerating capacity required to be kept when the laser works in the best state, detects the temperature of each heating component in the laser in real time, and corrects the refrigerating capacity of each heating component in the laser in a cooling scheme in time according to the detected real-time temperature and the temperature in the optimized refrigerating scheme, so as to achieve the aim of realizing the photo-mechanical heat balance of the laser from the whole area. The laser has the advantages of strong environment self-adaptive capacity, good output beam quality and excellent product performance in long-time working stability.)

1. A method for realizing stable output of a laser is characterized by comprising the following steps: the method comprises the following steps:

1) respectively drawing the relation curves of the refrigerating capacity of each heating element in the laser shell under rated power, the heat dissipation power of the refrigerating assembly and the surface temperature;

2) according to a laser simulation model provided with refrigeration components, obtaining the heat dissipation power value and the surface temperature value of the refrigeration components after adjustment of each refrigeration component when the minimum deformation of a laser base plate is achieved; obtaining the refrigerating capacity corresponding to the minimum deformation of the laser bottom plate according to the relation curve in the step 1);

3) building laser system with dynamic thermal balance capability

Installing corresponding refrigeration components for each heating component in the laser shell according to the refrigeration capacity found in the step 2), and arranging a temperature detector on each heating component; then the temperature detector, the refrigeration assembly and the laser control unit are in data connection, and a laser system with dynamic heat balance capability is built;

4) controlling output stability of a laser

The laser control unit adjusts the refrigerating capacity of the corresponding refrigerating assembly according to the temperature change of each heating component, so that the temperature values of the heating components return to the temperature value which originally maintains the minimum deformation of the laser bottom plate, and the stable output of the laser is realized.

2. The method of claim 1, wherein: if the temperature change of a certain heating component is too large, so that the adjustment of the refrigeration assembly can not recover the original temperature, the method also comprises the following steps:

the computer reconstructs a laser bottom plate temperature distribution diagram according to the temperature distribution of each heating element acquired by the temperature sensor, simulates and calculates the thermal deformation of the laser bottom plate at the moment again, and sets the refrigerating capacity of the refrigerating assembly according to the thermal deformation;

repeatedly correcting the refrigerating capacity and re-simulating the thermal deformation of the laser bottom plate until a new minimum deformation quantity of the laser main body bottom plate is obtained;

the computer sends the new refrigerating capacity to each refrigerating assembly, so that the minimum thermal deformation of the laser bottom plate is maintained, and the stable output of the laser is realized.

3. The method for realizing stable output of laser according to claim 1 or 2, wherein: the specific implementation process of the step 1) is as follows:

1.1) determining each heating component inside the laser shell;

1.2) arranging a refrigeration assembly on each heating component;

1.3) enabling each heating component to work under rated power to obtain the heat dissipation power of the refrigeration component corresponding to each heating component;

1.4) changing the refrigerating capacity of each refrigerating assembly to obtain a relation curve of the refrigerating capacity of each heating element under rated power, the heat dissipation power of the refrigerating assembly and the surface temperature.

4. The method of claim 3, wherein: the specific implementation process of the step 2) is as follows:

2.1) establishing a laser simulation model provided with a refrigeration assembly;

2.2) according to the relation curve obtained in the step 1 and the distribution position of each heating component in the laser model, simulating the temperature field distribution and the thermal deformation of each heating component on the laser simulation model, and constructing a thermal deformation three-dimensional distribution map in the laser;

2.3) repeatedly adjusting the heat dissipation power of the hottest large deformation area and the surface temperature value of the refrigeration assembly on the thermal deformation three-dimensional distribution map until the thermal deformation three-dimensional distribution map of the minimum deformation of the laser base plate is obtained;

2.4) obtaining the heat dissipation power value and the surface temperature value of each refrigeration assembly after adjustment when the deformation amount of the bottom plate is the minimum according to the thermal deformation three-dimensional distribution map of the minimum deformation amount of the laser bottom plate;

and 2.5) finding out the refrigerating capacity required by each heating component when the minimum deformation of the laser bottom plate is realized according to the heat dissipation power value and the surface temperature value of each refrigerating component after the adjustment of each refrigerating component and the relation curve in the step 1.

5. The method of claim 4, wherein the heat generating components comprise L D pump module, laser crystal module, electro-optical or acousto-optical modulator module, and circuit control modules mounted on the laser substrate.

6. The method of claim 1, wherein: the refrigeration assembly comprises a water cooling plate, a water cooling machine, a water cooling pipeline and a flow valve;

the water cooling plates are multiple and are respectively arranged between each heating component and the laser bottom plate;

the water cooling pipelines are respectively arranged between each water cooling plate and the water cooling machine and used for supplying water to the water cooling plates through the water cooling machines;

the flow valves are multiple and are respectively installed on each water-cooling pipeline and used for adjusting water flow passing through each water-cooling pipeline.

7. The method of claim 1, wherein: the refrigerating assembly comprises a semiconductor refrigerating sheet, a temperature controller and a cable;

the semiconductor refrigerating pieces are multiple and are respectively arranged between each heating component and the laser bottom plate;

the temperature controller is positioned outside the laser shell and is electrically connected with the semiconductor refrigerating sheet through a cable.

8. A laser system comprises a laser main body, a water cooler and a laser control unit; the method is characterized in that: the device also comprises a water cooling plate, a temperature detector, a water cooling pipeline and a flow valve;

the water cooling plates are multiple and are respectively arranged between each heating component in the laser main body and the bottom plate of the laser main body;

the temperature detectors are arranged on each heating element respectively and used for detecting the real-time temperature value of each heating element;

the water cooling pipelines are respectively arranged between each water cooling plate and the water cooling machine and used for supplying water to the water cooling plates through the water cooling machines;

the flow valves are respectively arranged on each water-cooling pipeline and used for adjusting the water flow passing through each water-cooling pipeline;

and the temperature detector and the flow valve are in data connection with the laser control unit.

9. The laser system as recited in claim 8, wherein said heat generating components comprise L D pump module, laser crystal module, electro-optical or acousto-optical modulator module, and circuit control modules mounted on the laser substrate.

10. The laser system of claim 8, wherein: the laser control unit is a built-in computer of the laser main body.

11. A laser system includes a laser main body and a laser control unit; the method is characterized in that: the refrigerator also comprises a semiconductor refrigerating sheet, a temperature controller, a cable and a temperature sensor;

the semiconductor refrigerating pieces are multiple and are respectively arranged between each heating component and the laser bottom plate;

the temperature controller is positioned outside the laser shell and is electrically connected with the semiconductor refrigerating sheet through a cable;

the temperature detectors are arranged on each heating element respectively and used for detecting the real-time temperature value of each heating element;

the temperature detector, the semiconductor refrigerating sheet and the temperature controller are all in data connection with the laser control unit.

12. The laser system as recited in claim 11, wherein said heat generating components comprise an L D pump module, a laser crystal module, an electro-optic or acousto-optic modulator module, and circuit control modules mounted on the laser substrate.

13. The laser system of claim 12, wherein: the laser control unit is a built-in computer of the laser main body.

Technical Field

The invention belongs to the technical field of lasers, and particularly relates to a method for realizing stable output of a laser and a laser system.

Background

Among all the parameters of the laser, the output power and stability of the laser are the most basic technical indicators of the output characteristics of the laser, and are also particularly important indicator parameters, and directly affect the quality and efficiency of processing.

The main factors influencing the output power and the stability of the laser include working current, working voltage, working temperature and the like, wherein the working temperature not only influences the stability of the output power of the laser, but also influences the pointing stability of the laser, the beam quality and other key parameters, and the application requirements of the parameters in the fields such as laser processing and the like are extremely strict, for example, the pointing stability of the laser is in rad/DEG C, and the basis for measuring the advantages and disadvantages of the laser is the capability of keeping the pointing direction of the beam along with the change of the environmental temperature.

For example, in the field of laser micromachining, the precision of micromachining can reach 1.5um, and the minimum size of an etchable microstructure is tens of micrometers, so that high-precision material machining requires that a laser beam used as an optical knife keeps nearly unchanged transmission characteristics in the working process, and the tiny jitter of the laser beam causes the light beam focused on the material to seriously deviate or lose focus, thereby causing the machining quality to be degraded and the machining precision to be reduced.

Meanwhile, the laser product applied to the industrial field has the external environment no longer being a constant-temperature and constant-humidity laboratory environment, and the self-adaptive capacity after temperature change is the first challenge of the laser product.

Therefore, how to design and produce a laser product with strong environment self-adaptive capability, good beam quality and excellent long-time working stability is a bottleneck technology which is particularly important for the current industrialized laser product.

Disclosure of Invention

The invention provides a method for realizing stable output of a laser, aiming at ensuring that the laser has stronger environment self-adaptive capacity, good output beam quality and excellent product performance in long-time working stability.

Meanwhile, the invention also provides a laser system with strong environment self-adaption capability and strong output stability.

The basic design principle of the invention is as follows:

the invention provides a method for realizing stable output of a laser, which comprises the steps of analyzing and calculating the heating condition of each heating component in the laser, simulating the refrigerating capacity required to be kept when the laser works in the optimal state, detecting the temperature of each heating component in the laser in real time, and correcting the refrigerating capacity of each heating component in the laser in a cooling scheme in time according to the detected real-time temperature and the temperature in an optimized refrigerating scheme, so as to achieve the aim of starting from a whole local area and finally realizing the optical-mechanical heat balance of the laser.

The specific technical scheme of the invention is as follows:

a method for realizing stable output of a laser comprises the following steps:

1) respectively drawing the relation curves of the refrigerating capacity of each heating element in the laser shell under rated power, the heat dissipation power of the refrigerating assembly and the surface temperature;

2) according to a laser simulation model provided with refrigeration components, obtaining the heat dissipation power value and the surface temperature value of the refrigeration components after adjustment of each refrigeration component when the minimum deformation of a laser base plate is achieved; then, according to the relation curve in the step 1, obtaining the refrigerating capacity corresponding to the minimum deformation of the laser bottom plate;

3) building laser system with dynamic thermal balance capability

According to the refrigerating capacity found in the step 2, installing corresponding refrigerating components for each heating component in the laser shell, and arranging a temperature detector on each heating component; then the temperature detector, the refrigeration assembly and the laser control unit are in data connection, and a laser with dynamic heat balance capability is built;

4) controlling output stability of a laser

The laser control unit adjusts the refrigerating capacity of the corresponding refrigerating assembly according to the temperature change of each heating component, so that the temperature values of the heating components return to the temperature value which originally maintains the minimum deformation of the laser bottom plate, and the stable output of the laser is realized.

Further, if the temperature change of a certain heating component is too large, so that the adjustment of the refrigeration assembly cannot recover the original temperature, the method further comprises the following steps:

the computer reconstructs a laser bottom plate temperature distribution diagram according to the temperature distribution of each heating element acquired by the temperature sensor, simulates and calculates the thermal deformation of the laser bottom plate at the moment again, and sets the refrigerating capacity of the refrigerating assembly according to the thermal deformation;

repeatedly correcting the refrigerating capacity and re-simulating the thermal deformation of the laser bottom plate until a new minimum deformation quantity of the laser main body bottom plate is obtained;

the computer sends the new refrigerating capacity to each refrigerating assembly, so that the minimum thermal deformation of the laser bottom plate is maintained, and the stable output of the laser is realized.

Further, the specific implementation process of step 1) is as follows:

1.1) determining each heating component inside the laser shell;

1.2) arranging a refrigeration assembly on each heating component;

1.3) enabling each heating component to work under rated power to obtain the heat dissipation power of the refrigeration component corresponding to each heating component;

1.4) changing the refrigerating capacity of each refrigerating assembly to obtain a relation curve of the refrigerating capacity of each heating element under rated power, the heat dissipation power of the refrigerating assembly and the surface temperature.

Further, the specific implementation process of step 2) is as follows:

2.1) establishing a laser simulation model provided with a refrigeration assembly;

2.2) according to the relation curve obtained in the step 1 and the distribution position of each heating component in the laser model, simulating the temperature field distribution and the thermal deformation of each heating component on the laser simulation model, and constructing a thermal deformation three-dimensional distribution map in the laser;

2.3) repeatedly adjusting the heat dissipation power of the hottest large deformation area and the surface temperature value of the refrigeration assembly on the thermal deformation three-dimensional distribution map until the thermal deformation three-dimensional distribution map of the minimum deformation of the laser base plate is obtained;

2.4) obtaining the heat dissipation power value and the surface temperature value of each refrigeration assembly after adjustment when the deformation amount of the bottom plate is the minimum according to the thermal deformation three-dimensional distribution map of the minimum deformation amount of the laser bottom plate;

2.5) according to the heat dissipation power value and the surface temperature value of the refrigeration assembly after being adjusted by each refrigeration assembly, finding out the refrigerating capacity required by each heating element when the minimum deformation of the laser bottom plate is achieved from the relation curve in the step 1;

the refrigeration component can be selected from various modes, and the invention provides two modes which are respectively as follows:

the water-cooled refrigeration assembly comprises a water-cooled plate, a water-cooled machine, a water-cooled pipeline and a flow valve;

the water cooling plates are multiple and are respectively arranged between each heating component and the laser bottom plate;

the water cooling pipelines are respectively arranged between each water cooling plate and the water cooling machine and used for supplying water to the water cooling plates through the water cooling machines;

the flow valves are multiple and are respectively installed on each water-cooling pipeline and used for adjusting water flow passing through each water-cooling pipeline.

The electric cooling type refrigeration assembly comprises a semiconductor refrigeration piece, a temperature controller and a cable;

the semiconductor refrigerating pieces are multiple and are respectively arranged between each heating component and the laser bottom plate;

the temperature controller is positioned outside the laser shell and is electrically connected with the semiconductor refrigerating sheet through a cable.

Based on the above method, the present invention provides two laser system structures:

the first laser system comprises a laser main body, a water cooler, a laser control unit, a water cooling plate, a temperature detector, a water cooling pipeline and a flow valve;

the water cooling plates are multiple and are respectively arranged between each heating component in the laser main body and the bottom plate of the laser main body;

the temperature detectors are arranged on each heating element respectively and used for detecting the real-time temperature value of each heating element;

the water cooling pipelines are respectively arranged between each water cooling plate and the water cooling machine and used for supplying water to the water cooling plates through the water cooling machines;

the flow valves are respectively arranged on each water-cooling pipeline and used for adjusting the water flow passing through each water-cooling pipeline;

and the temperature detector and the flow valve are in data connection with the laser control unit.

A second laser system including a laser main body and a laser control unit; the method is characterized in that: the refrigerator also comprises a semiconductor refrigerating sheet, a temperature controller, a cable and a temperature sensor;

the semiconductor refrigerating pieces are multiple and are respectively arranged between each heating component and the laser bottom plate;

the temperature controller is positioned outside the laser shell and is electrically connected with the semiconductor refrigerating sheet through a cable;

the temperature detectors are arranged on each heating element respectively and used for detecting the real-time temperature value of each heating element;

the temperature detector, the semiconductor refrigerating sheet and the temperature controller are all in data connection with the laser control unit.

Furthermore, the heating components in the method and the laser system comprise an L D pumping module, a laser crystal module, an electro-optical or acousto-optical modulator module and circuit control modules mounted on a laser base plate.

Further, the method and the laser system have the laser control unit which is a built-in computer of the laser body.

The invention has the beneficial effects that:

the invention provides a method for realizing full-local real-time management aiming at the defect that the output characteristic of a laser is influenced by the heat accumulation of a device of the conventional high-power laser (not limited to a solid high-power laser), so that the laser is adaptively adjusted and kept in a light machine heat balance state along with the change of a working state and an environment, and further, the laser output with higher power stability, higher environmental reliability and higher light beam pointing stability is realized.

Meanwhile, the laser can adapt to more diversified external environment temperature changes, and provides better product performance for the downstream application industry of the high-power laser.

The method improves the stability of the output laser of the whole laser in the aspect of the thermal management design of the laser, is a direct and effective technical method for improving the reliability and the environmental adaptability of the laser, and solves the problems of poor environmental adaptability and low stability of a light source in the field of high-precision laser application.

Drawings

FIG. 1 is a flow chart of an implementation of the method of the present invention.

Fig. 2 is a graph of the relationship between the cooling capacity and the heat dissipation power and surface temperature of the cooling assembly.

Fig. 3 is a schematic diagram of the laser system structure of embodiment 1.

Fig. 4 is a schematic diagram of the laser system structure of embodiment 2.

The reference numbers are as follows:

1-a laser shell, 2-a water cooler, 3-a water cooling plate, 4-a water cooling pipeline, 5-a flow valve, 6-a heating element, 7-a laser bottom plate and 8-a computer; 9-display, 10-semiconductor refrigerating sheet, 11-temperature controller, 12-cable.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

A method for realizing stable output of a laser, as shown in fig. 1, mainly includes the following implementation steps:

step 1: determining each heating element in the laser shell;

step 2: respectively drawing a relation curve of refrigerating capacity of each heating element in the laser shell under rated power, heat dissipation power of the refrigerating assembly and surface temperature, as shown in fig. 2;

and step 3: according to a laser simulation model provided with refrigeration components, obtaining the heat dissipation power value and the surface temperature value of the refrigeration components after adjustment of each refrigeration component when the minimum deformation of a laser base plate is achieved; then, according to the relation curve in the step 2, the refrigerating capacity corresponding to the minimum deformation of the laser bottom plate is obtained;

and step 3: building laser system with dynamic thermal balance capability

According to the refrigerating capacity found in the step 2, installing corresponding refrigerating components for each heating component in the laser shell, and arranging a temperature detector on each heating component; then the temperature detector, the refrigeration assembly and the laser control unit are in data connection, and a laser system with dynamic heat balance capability is built;

and 4, step 4: controlling output stability of a laser

The laser control unit adjusts the refrigerating capacity of the corresponding refrigerating assembly according to the temperature change of each heating component, so that the temperature values of the heating components return to the temperature value which originally maintains the minimum deformation of the laser bottom plate, and the stable output of the laser is realized;

and 5: if the temperature change of a certain heating component is too large, the adjustment of the refrigeration assembly cannot recover the original temperature: the computer reconstructs a laser bottom plate temperature distribution diagram according to the temperature distribution of each heating element acquired by the temperature sensor, simulates and calculates the thermal deformation of the laser bottom plate at the moment again, and sets the refrigerating capacity of the refrigerating assembly according to the thermal deformation;

repeatedly correcting the refrigerating capacity and re-simulating the thermal deformation of the laser bottom plate until a new minimum deformation quantity of the laser main body bottom plate is obtained;

the computer sends the new refrigerating capacity to each refrigerating assembly, so that the minimum thermal deformation of the laser bottom plate is maintained, and the stable output of the laser is realized.