脉冲LD端面抽运单掺铥激光器瞬态热效应研究.docx

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Abstract：
Pulse LD front face pumped single doped thulium laser has many excellent properties, such as high output power, high efficiency, and stable performance, which make it widely used in various fields. However, its transient thermal effects are also an important factor affecting its performance. Through the study of the transient thermal effects of pulse LD front face pumped single doped thulium laser, it is helpful to analyze its internal heat transfer mechanism, further improve its thermal management, and improve its performance.
Introduction：
Pulse LD front face pumped single doped thulium laser has attracted great attention due to its excellent properties, such as high output power, high efficiency, and stable performance, which make it widely used in various fields, such as medical treatment, material processing, and information processing. However, the transient thermal effects of pulse LD front face pumped single doped thulium laser also have an important impact on its performance. The transient thermal effects refer to the process in which the heat generated by the pump light absorbed by the system is transferred and dissipated, leading to changes in the temperature distribution of the system and resulting in changes in its optical and electrical properties. Therefore, the study of the transient thermal effects of pulse LD front face pumped single doped thulium laser is of great significance for further improving its performance.
Content：
1. The principle of pulse LD front face pumped single doped thulium laser
The pulse LD front face pumped single doped thulium laser is mainly composed of a pump LD, a single doped thulium crystal, and a cavity structure. The pump LD is used to provide excitation energy for the single doped thulium crystal, and the thulium atoms are excited to the upper energy level. Under the action of the cavity structure, the excited thulium atoms will emit laser light. The pulse LD front face pumping method is used to achieve high efficiency of the excitation process, and the generated heat will be concentrated in the front face of the thulium crystal.
2. Transient thermal effects of pulse LD front face pumped single doped thulium laser
During the process of pulse LD front face pumping of single doped thulium laser, a large amount of heat will be generated in the front face of the thulium crystal due to the absorption of pump light. The heat flux density in the front face will be quite high, which will cause a rapid increase in temperature. The temperature distribution of the system will be affected by many factors, such as the heat source distribution, the thermal conductivity of the material, the heat transfer coefficient with the surrounding medium, and the convective heat transfer. In addition, the transient thermal effects will lead to changes in the refractive index, absorption coefficient, and other optical properties of the thulium crystal, thereby affecting the output power and wavelength of the laser.
3. Study on transient thermal effects of pulse LD front face pumped single doped thulium laser
In order to study the transient thermal effects of pulse LD front face pumped single doped thulium laser, many scholars have carried out related research. For example, some scholars use finite element method to establish a thermal model of the system and analyze the temperature distribution of the system under different operating conditions. Some scholars use high-speed infrared thermal imaging technology to observe the transient temperature changes of the thulium crystal front face, and analyze the influence of the input energy, crystal size, and cooling conditions on the temperature change. Some scholars use numerical simulation to analyze the thermal stresses generated by the thermal expansion of the thulium crystal and the substrate material during the cooling process. Some scholars use experimental methods to verify the thermal model and analyze the thermal response time of the system. Through these studies, the internal heat transfer mechanism of the system can be analyzed, and the thermal management of the system can be further improved.
Conclusion：
The study of transient thermal effects of pulse LD front face pumped single doped thulium laser is of great significance for further improving its performance. The transient thermal effects will lead to changes in the temperature distribution, optical properties, and electrical properties of the system, and the internal heat transfer mechanism of the system can be analyzed through the study of the transient thermal effects. In future research, more attention should be paid to the optimization of the thermal management system, and the impact of transient thermal effects on the stability and reliability of the system should be further studied.