角泵浦Nd:YAG复合板条基模激光器及其光束对称性研究
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摘要
本论文研究角泵浦的Nd:YAG复合板条基模激光器及其光束对称性。
在选择适当的增益材料和泵浦源的基础上,论文首先使用光线追迹的数值分析方法重点计算了单角泵浦时激光介质各项参数对泵浦吸收效率和均匀性的影响,给出了各参数的最佳范围并据此设计加工了优化复合板条。实验中,通过使激光器在工作在dωL / dfth< 0的稳区边缘,在满泵浦功率45.9W下得到11.94W激光输出,光光效率26%,两方向光束质量分别为1.18和1.34,首次实现了角泵浦固体激光器的基模运转。
为了研究角泵浦激光器输出不对称性的热效应根源,论文建立了较为完善的复合板条热力学模型,采用有限差分法计算得到了板条内部的温度分布模型以及热焦距随泵浦功率变化的规律,并在未出激光条件下进行了验证实验,实验结果与理论计算结果基本相符。通过热分析,论文提出三种方法来改善复合板条热焦距的对称性,对于可行性较高的绝热槽热沉方案,数值计算分析结果表明:当绝热槽槽宽0.325 mm,槽深2 mm时,板条两方向的热焦距大致相等。实验结果表明,绝热槽热沉可以使板条两方向热焦距比由原来的3.86倍缩小到2.19倍,一定程度上改善了热焦距的不对称性,同时提出考虑端面效应和提高绝热槽加工精度可以进一步使两方向热焦距大致对称。
随后,论文采用等价腔分析方法,分析了一种通过改变谐振腔参数来得到对称激光输出的谐振腔设计,并进行了实验验证。实验结果表明,这种谐振腔设计方法可以在一定泵浦功率范围内保持激光输出的对称性。该方法简单实用,同样适用于因非对称散热或非对称泵浦而造成输出不对称的其它泵浦方式。
论文还对角泵浦固体激光器的温度特性进行了光线追迹分析和实验研究。在LD泵浦电流40A,LD温度15℃至25℃时,激光器输出功率变化小于5%,光束质量基本无变化。进一步由理论分析可以预期,在LD温度为10℃至30℃甚至更大范围内,激光器的基模输出仍将保持相当好的稳定性。理论分析和实验结果均表明角泵浦固体激光器具有较好的温度适应特性。
This thesis focuses on the LD bar corner-pumped TEM00 CW composite Nd:YAG laser and symmetry of the output.
After the fit gain medium and pump source were been chosen, ray-tracing algorithm was used to simulate the pump absorption efficiency and pump absorption distribution of LD corner-pumped laser with different parameters of Nd:YAG composite slab crystal. The optimized slab was designed and manufactured according to the results of the ray-tracing simulating. Resonator experiment was performed to suppress the oscillation of higher-order modes and realize TEM00 operation. Experiment results showed that the output power was 11.94W with the optical-optical efficiency of above 26%, and the M2 factors of beam quality at width and thickness directions were 1.18 and 1.34, respectively. It was the first time that corner-pumped solid-state lasers operated in fundmental mode.
For studying the thermal effects which induced the asymmetry of the output of corner-pumped lasers, an appropriate thermodynamics mode was established and finite difference method was used to calculate the temperature distribution of composite slab and the thermal focal length as fuction of pump power. The experimental results agreed well with the calculated results under non-lasing conditions. According to the thermal analysis, heat sink with the adiabatic groove was used to improve the asymmetry of the thermal focal length of composite slab. The numerical analysis indicated that the thermal focal length of two directions could be equal when the width of groove was 0.325 mm and the depth of it was 2 mm. The experiment results showed that the difference of the thermal focal length of two directions decreased from 3.86 times to 2.19 times when the Heat sink with the adiabatic groove was employed. Improving process precision of groove and the calculation taking into account end effect were put forward to ulteriorly improve the asymmetrical thermal focal length.
At last, the influence of LD temperature fluctuation on the performance of corner-pumped TEM00 laser was investigated by numerical ray tracing method and laser experiment. At a drive current of 40A, when the LD temperature varies from 15℃to 25℃, the fluctuation of output power is less than 5% and the beam quality remains almost invariable. Furthermore, it could be anticipated that the TEM00 output should still remain stabe, with the LD temperature variation in the range between 10 degree and 30 degree or even in a wider range according to the simulation. Both the theoretical analysis and experimental results show that the corner-pumped TEM00 laser has a good tolerance to temperature fluctuation.
在选择适当的增益材料和泵浦源的基础上,论文首先使用光线追迹的数值分析方法重点计算了单角泵浦时激光介质各项参数对泵浦吸收效率和均匀性的影响,给出了各参数的最佳范围并据此设计加工了优化复合板条。实验中,通过使激光器在工作在dωL / dfth< 0的稳区边缘,在满泵浦功率45.9W下得到11.94W激光输出,光光效率26%,两方向光束质量分别为1.18和1.34,首次实现了角泵浦固体激光器的基模运转。
为了研究角泵浦激光器输出不对称性的热效应根源,论文建立了较为完善的复合板条热力学模型,采用有限差分法计算得到了板条内部的温度分布模型以及热焦距随泵浦功率变化的规律,并在未出激光条件下进行了验证实验,实验结果与理论计算结果基本相符。通过热分析,论文提出三种方法来改善复合板条热焦距的对称性,对于可行性较高的绝热槽热沉方案,数值计算分析结果表明:当绝热槽槽宽0.325 mm,槽深2 mm时,板条两方向的热焦距大致相等。实验结果表明,绝热槽热沉可以使板条两方向热焦距比由原来的3.86倍缩小到2.19倍,一定程度上改善了热焦距的不对称性,同时提出考虑端面效应和提高绝热槽加工精度可以进一步使两方向热焦距大致对称。
随后,论文采用等价腔分析方法,分析了一种通过改变谐振腔参数来得到对称激光输出的谐振腔设计,并进行了实验验证。实验结果表明,这种谐振腔设计方法可以在一定泵浦功率范围内保持激光输出的对称性。该方法简单实用,同样适用于因非对称散热或非对称泵浦而造成输出不对称的其它泵浦方式。
论文还对角泵浦固体激光器的温度特性进行了光线追迹分析和实验研究。在LD泵浦电流40A,LD温度15℃至25℃时,激光器输出功率变化小于5%,光束质量基本无变化。进一步由理论分析可以预期,在LD温度为10℃至30℃甚至更大范围内,激光器的基模输出仍将保持相当好的稳定性。理论分析和实验结果均表明角泵浦固体激光器具有较好的温度适应特性。
This thesis focuses on the LD bar corner-pumped TEM00 CW composite Nd:YAG laser and symmetry of the output.
After the fit gain medium and pump source were been chosen, ray-tracing algorithm was used to simulate the pump absorption efficiency and pump absorption distribution of LD corner-pumped laser with different parameters of Nd:YAG composite slab crystal. The optimized slab was designed and manufactured according to the results of the ray-tracing simulating. Resonator experiment was performed to suppress the oscillation of higher-order modes and realize TEM00 operation. Experiment results showed that the output power was 11.94W with the optical-optical efficiency of above 26%, and the M2 factors of beam quality at width and thickness directions were 1.18 and 1.34, respectively. It was the first time that corner-pumped solid-state lasers operated in fundmental mode.
For studying the thermal effects which induced the asymmetry of the output of corner-pumped lasers, an appropriate thermodynamics mode was established and finite difference method was used to calculate the temperature distribution of composite slab and the thermal focal length as fuction of pump power. The experimental results agreed well with the calculated results under non-lasing conditions. According to the thermal analysis, heat sink with the adiabatic groove was used to improve the asymmetry of the thermal focal length of composite slab. The numerical analysis indicated that the thermal focal length of two directions could be equal when the width of groove was 0.325 mm and the depth of it was 2 mm. The experiment results showed that the difference of the thermal focal length of two directions decreased from 3.86 times to 2.19 times when the Heat sink with the adiabatic groove was employed. Improving process precision of groove and the calculation taking into account end effect were put forward to ulteriorly improve the asymmetrical thermal focal length.
At last, the influence of LD temperature fluctuation on the performance of corner-pumped TEM00 laser was investigated by numerical ray tracing method and laser experiment. At a drive current of 40A, when the LD temperature varies from 15℃to 25℃, the fluctuation of output power is less than 5% and the beam quality remains almost invariable. Furthermore, it could be anticipated that the TEM00 output should still remain stabe, with the LD temperature variation in the range between 10 degree and 30 degree or even in a wider range according to the simulation. Both the theoretical analysis and experimental results show that the corner-pumped TEM00 laser has a good tolerance to temperature fluctuation.
引文
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