侧面泵浦Nd：YAG-KGW波长捷变喇曼激光器研究
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摘要
本文研究了侧面泵浦Nd:YAG-KGW波长捷变固体喇曼激光器技术。
为研发多功能集成一体小型化的可控多波长固体激光器,尝试解决两个技术问题:(1)传导冷却方式下,泵浦与散热之间的“空间干涉”问题;(2)多波长激光器的波长受控输出即“波长捷变”问题。针对这两个技术问题,提出了两个相应的技术解决方案:分布式侧面泵浦技术和可控多波长固体喇曼激光器波长快速切换受控输出技术。
首先研究了喇曼基波源激光模块的分布式侧面泵浦技术。设计了分段间隔侧泵结构,提出并设计了交错分布补偿式侧泵结构;进行了热光效应仿真;设计了两个分段间隔侧泵的1064nm激光器验证实验,从实验层面上检验了方法和技术的有效性。理论分析和实验结果表明:分布式侧泵平衡了泵浦与散热之间的“空间冲突”,减小了激光棒径向平均温度梯度,减少了热光危害。
其次研究了固体喇曼激光器的波长受控输出技术。设计了双波长捷变的‘T’型腔方案:利用钨酸钆钾KGd(WO_4)_2喇曼晶体(KGW)的偏振依靠属性,并借助λ/2电光偏振开关实现两个一级喇曼线的双波长捷变。提出并设计了两个新型谐振腔—‘H’型腔和喇曼可扩展腔,来实现喇曼激光器的多波长捷变运转。
最后对分布式侧面泵浦波长捷变固体喇曼激光器进行了实验研究。设计了一个单波长运转的喇曼激光器实验,从实验层面考查了采用分段间隔侧泵激光器模块作为喇曼激光器基波源的应用效果及仿真计算的有效性,实验获得最大脉冲能量126mJ、峰值功率21MW,Diode-Stokes光-光效率18.2%;设计了分段间隔侧泵双波长捷变固体喇曼激光器实验,从实验层面考查了双波长快速切换受控输出技术的有效性。输出1177nm(1159nm)波长时,脉冲能量达114mJ(98mJ) ,峰值功率为19MW(15MW) , Diode-Stokes光-光效率为15.3%(13.2%);对于采用传导致冷方式的Nd:YAG-KGW喇曼激光器,这些指标是迄今为止最好的指标。
研究表明:分布式侧泵是解决“空间冲突”,摆脱复杂液冷装置的有效方法;波长快速切换受控输出技术是实现多波长调制和编码的有效解决方案。
This thesis focuses on a segmented circular LD arrays side-pumped all-solid-state Nd:YAG /KGd(WO_4)_2 Raman laser operating in wave-agility.
Side-pumped geometry design of lasers concerns on how to solve the space conflict between pump and heat-removal device due to the demands for larger lateral surface of a laser rod. The thesis tries to provide a configuration of the segmented periodical side pumping to get rid of the complex liquid cooling system and balance the space conflict. It has probably potential to be used in compact and miniature laser systems, especially in low and medium power applications.
The investigation of wavelength-agility lidar focuses on how to solve the quick wavelength-switch among multiwave. The thesis tries to provide a practical method of quick wavelength-switch to realize the wavelength-selective, output-modulated and coding operation in a solid-state Raman laser.
First, segmented circular LD arrays side-pumped and the side-pumped structure with alternating compensated arrangement have been proposed to solve the space conflict between pump and heat-removal device. Design optimization and simulation on the temperature distribution and the thermo-optic effects of laser rods have been performed. Two experiments on segmented side-pumped Nd: YAG a laser rod have also been carried out to verify the availability of side-pumped geometry design. The results indicate the conflict can be balanced better by the segmented side-pumped geometry in a periodical arrangement between circular LD arrays and holders. This novel design has great potential to be used in compact and miniature laser systems.
Next,the quick wavelength-switch among multiwave of Raman laser has been investigated. The three designs of T-shape folded cavity configuration, H-shape and Raman extended cavity configuration have been demonstrated. The investigation focuses on T-shape folded cavity configuration. Aλ/2 electro-optical switch SW was introduced in the configuration, by which we can conveniently control the linear polarization direction of fundamental beam. By virtue of the polarization-dependent property of KGd(WO_4)_2 crystal, the purpose of controlling and selecting Raman wavelengths can be finally reached. The related parameters in Raman laser have been calculated. The simulation on thermal loading in Raman crystal and the curvature optimization of Raman mirrors have also been performed.
The experiment of segment-pumped Nd:YAG-KGW Raman laser operating in 1177nm validated that the fundamental resource employing segmental side-pumped Nd:YAG module is available in intracavity Raman laser. A maximum pulse energy of 126mJ and a peak power of 21MW are achieved, corresponding to an overall Diode-Stokes conversion efficiency of 18.2%. The experimental results support the validity of calcaulation and simulation in Raman laser.
Finally, the experimental investigation on a segmented circular LD arrays side-pumped all-solid-state Nd: YAG /KGd(WO_4)_2 Raman laser operating in two colors modulation has been carred out. The output wavelength can be switched quickly between 1159nm and 1177nm and the Raman output modulated in spectra-time domains was achieved. Raman pulse energy up to 114mJ at 1177nm and 98mJ at 1159nm were obtained respectively, corresponding to an overall Diode-Stokes conversion efficiency of 15.3% at 1177nm and 13.2% at 1159nm. To our knowledge, these are the best performance reported to date for an EO Q-switched tunable folded cavity Nd:YAG-KGW Raman laser with conductive cooling and air exchanging.
The investigation reveals that the segmented LD arrays side-pumped configuration provides a way to get rid of the complex liquid cooling system and the quick wavelength-switch among multiwave of Raman laser provides a solution to realize the output-modulated and coding operation in spectra-time domains.
为研发多功能集成一体小型化的可控多波长固体激光器,尝试解决两个技术问题:(1)传导冷却方式下,泵浦与散热之间的“空间干涉”问题;(2)多波长激光器的波长受控输出即“波长捷变”问题。针对这两个技术问题,提出了两个相应的技术解决方案:分布式侧面泵浦技术和可控多波长固体喇曼激光器波长快速切换受控输出技术。
首先研究了喇曼基波源激光模块的分布式侧面泵浦技术。设计了分段间隔侧泵结构,提出并设计了交错分布补偿式侧泵结构;进行了热光效应仿真;设计了两个分段间隔侧泵的1064nm激光器验证实验,从实验层面上检验了方法和技术的有效性。理论分析和实验结果表明:分布式侧泵平衡了泵浦与散热之间的“空间冲突”,减小了激光棒径向平均温度梯度,减少了热光危害。
其次研究了固体喇曼激光器的波长受控输出技术。设计了双波长捷变的‘T’型腔方案:利用钨酸钆钾KGd(WO_4)_2喇曼晶体(KGW)的偏振依靠属性,并借助λ/2电光偏振开关实现两个一级喇曼线的双波长捷变。提出并设计了两个新型谐振腔—‘H’型腔和喇曼可扩展腔,来实现喇曼激光器的多波长捷变运转。
最后对分布式侧面泵浦波长捷变固体喇曼激光器进行了实验研究。设计了一个单波长运转的喇曼激光器实验,从实验层面考查了采用分段间隔侧泵激光器模块作为喇曼激光器基波源的应用效果及仿真计算的有效性,实验获得最大脉冲能量126mJ、峰值功率21MW,Diode-Stokes光-光效率18.2%;设计了分段间隔侧泵双波长捷变固体喇曼激光器实验,从实验层面考查了双波长快速切换受控输出技术的有效性。输出1177nm(1159nm)波长时,脉冲能量达114mJ(98mJ) ,峰值功率为19MW(15MW) , Diode-Stokes光-光效率为15.3%(13.2%);对于采用传导致冷方式的Nd:YAG-KGW喇曼激光器,这些指标是迄今为止最好的指标。
研究表明:分布式侧泵是解决“空间冲突”,摆脱复杂液冷装置的有效方法;波长快速切换受控输出技术是实现多波长调制和编码的有效解决方案。
This thesis focuses on a segmented circular LD arrays side-pumped all-solid-state Nd:YAG /KGd(WO_4)_2 Raman laser operating in wave-agility.
Side-pumped geometry design of lasers concerns on how to solve the space conflict between pump and heat-removal device due to the demands for larger lateral surface of a laser rod. The thesis tries to provide a configuration of the segmented periodical side pumping to get rid of the complex liquid cooling system and balance the space conflict. It has probably potential to be used in compact and miniature laser systems, especially in low and medium power applications.
The investigation of wavelength-agility lidar focuses on how to solve the quick wavelength-switch among multiwave. The thesis tries to provide a practical method of quick wavelength-switch to realize the wavelength-selective, output-modulated and coding operation in a solid-state Raman laser.
First, segmented circular LD arrays side-pumped and the side-pumped structure with alternating compensated arrangement have been proposed to solve the space conflict between pump and heat-removal device. Design optimization and simulation on the temperature distribution and the thermo-optic effects of laser rods have been performed. Two experiments on segmented side-pumped Nd: YAG a laser rod have also been carried out to verify the availability of side-pumped geometry design. The results indicate the conflict can be balanced better by the segmented side-pumped geometry in a periodical arrangement between circular LD arrays and holders. This novel design has great potential to be used in compact and miniature laser systems.
Next,the quick wavelength-switch among multiwave of Raman laser has been investigated. The three designs of T-shape folded cavity configuration, H-shape and Raman extended cavity configuration have been demonstrated. The investigation focuses on T-shape folded cavity configuration. Aλ/2 electro-optical switch SW was introduced in the configuration, by which we can conveniently control the linear polarization direction of fundamental beam. By virtue of the polarization-dependent property of KGd(WO_4)_2 crystal, the purpose of controlling and selecting Raman wavelengths can be finally reached. The related parameters in Raman laser have been calculated. The simulation on thermal loading in Raman crystal and the curvature optimization of Raman mirrors have also been performed.
The experiment of segment-pumped Nd:YAG-KGW Raman laser operating in 1177nm validated that the fundamental resource employing segmental side-pumped Nd:YAG module is available in intracavity Raman laser. A maximum pulse energy of 126mJ and a peak power of 21MW are achieved, corresponding to an overall Diode-Stokes conversion efficiency of 18.2%. The experimental results support the validity of calcaulation and simulation in Raman laser.
Finally, the experimental investigation on a segmented circular LD arrays side-pumped all-solid-state Nd: YAG /KGd(WO_4)_2 Raman laser operating in two colors modulation has been carred out. The output wavelength can be switched quickly between 1159nm and 1177nm and the Raman output modulated in spectra-time domains was achieved. Raman pulse energy up to 114mJ at 1177nm and 98mJ at 1159nm were obtained respectively, corresponding to an overall Diode-Stokes conversion efficiency of 15.3% at 1177nm and 13.2% at 1159nm. To our knowledge, these are the best performance reported to date for an EO Q-switched tunable folded cavity Nd:YAG-KGW Raman laser with conductive cooling and air exchanging.
The investigation reveals that the segmented LD arrays side-pumped configuration provides a way to get rid of the complex liquid cooling system and the quick wavelength-switch among multiwave of Raman laser provides a solution to realize the output-modulated and coding operation in spectra-time domains.
引文
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