窄带脉冲周期极化光学参量放大技术研究
发布时间：2019-04-30 07:25
【摘要】：基于二阶非线性光学效应的光学参量下转换技术是获得可调谐变频相干光辐射的有效途径。尤其是近些年来周期极化晶体的出现,为参量光源提供了又一次飞跃式发展的契机。然而普通光学参量振荡器(optical parametric oscillator,OPO)受到泵浦光线宽、参量增益带宽的影响,往往处于多纵模运转状态,其输出参量光线宽难以满足高分辨率光谱分析等某些应用的需求,因此为了压缩参量光的光谱,人们发展了种子注入式OPO。但种子注入OPO往往需要复杂的反馈控制系统,这不仅使其成本高昂、而且不利于小型集成化和使用方便。在这样的背景下,本文理论分析了采用基于周期极化晶体的光学参量放大器(optical parametric amplifier,OPA)来实现窄带脉冲参量激光输出的可能性,并通过后续实验初步验证了该方案的可行性。相比于种子注入OPO,虽然该方案对泵浦源性能有较高要求,但整个实验装置结构简单、无需谐振腔和复杂的控制系统,同时又能获得良好的光谱压缩效果,是窄线宽参量光源发展的一个新方向。本文开展的主要工作如下所述:一、通过文献调研,总结和分析国内外研究现状,并在归一化三波混频耦合振幅方程组的基础上,开展了窄带OPA的数值模拟,通过理论计算验证了单程参量放大可以获得有效的窄带参量光输出,得到了实验所需的泵浦光峰值功率、种子光平均功率以及对应晶体长度等信息。为后续实验的开展奠定了理论基础。二、为了开展近红外窄带OPA实验,首先搭建了LBO-Nd:YAG内腔倍频532nm脉冲激光作为泵浦源,然后对光纤耦合输出的820 nm种子光进行了性能测试,最后实验验证了两级放大、近红外窄带OPA的出光,并获得了280 mW的平均功率和140μJ的脉冲能量,输出信号光线宽为14.9 pm。同时,通过实验经验总结了窄带脉冲OPA实验对泵浦源的性能要求。三、在前一部分实验的基础上,采用了商业化的高性能1064 nm微芯激光器作为泵浦源,以及1971 nm单频掺铥光纤激光器作为种子源,通过单级的参量放大获得了有效的2μm波段、双波长窄带参量光输出。1971.13 nm信号光脉冲能量达25μJ,线宽小于82.7 pm,2313.62 nm空闲光脉冲能量达17.8μJ,线宽小于102.3pm。结果表明,该结构是获得窄带近、中红外脉冲激光的可行方案,并具有进一步提升输出功率的潜力。
[Abstract]:The optical parameter down-conversion technique based on second-order nonlinear optical effect is an effective way to obtain tunable frequency coherent optical radiation. Especially, the appearance of periodic polarized crystals in recent years provides another opportunity for the development of parametric light source. However, ordinary optical parametric oscillator (optical parametric oscillator,OPO) is affected by pump light width and parametric gain bandwidth. It is often in multi-longitudinal mode operation, and its output parametric light width is difficult to meet the needs of some applications, such as high-resolution spectral analysis. Therefore, in order to compress the spectrum of parametric light, seed injection OPO. has been developed. However, the complex feedback control system is often needed for seed injection into OPO, which not only makes it expensive, but also is not conducive to small integration and convenient use. Under this background, the possibility of using optical parametric amplifier (optical parametric amplifier,OPA) based on periodically polarized crystal to achieve narrow-band pulse parametric laser output is theoretically analyzed in this paper. The feasibility of the scheme is verified by the follow-up experiments. Compared with seed injection OPO, although this scheme has higher performance requirements for pump source, the whole experimental device has simple structure, no need of resonant cavity and complex control system, and can obtain good spectral compression effect at the same time. It is a new direction in the development of narrow linewidth parametric light source. The main work of this paper is as follows: 1. Through literature investigation, the research status at home and abroad is summarized and analyzed, and on the basis of normalized three-wave mixing coupled amplitude equations, numerical simulation of narrow-band OPA is carried out. It is verified by theoretical calculation that one-pass parametric amplification can obtain an effective narrow-band parametric optical output. The peak power of pump light, the average power of seed light and the corresponding crystal length are obtained in the experiment. It lays a theoretical foundation for the development of the follow-up experiments. Secondly, in order to carry out the near infrared narrow-band OPA experiment, the LBO-Nd:YAG intracavity frequency-doubled 532nm pulse laser is constructed as the pump source, and then the performance test of the 820 nm seed light output by the fiber coupling is carried out. Finally, the two-stage amplification is verified by the experiment. The output of near infrared narrow band OPA is obtained, and the average power of 280 mW and pulse energy of 140 渭 J are obtained. The light width of the output signal is 14.9 pm.. At the same time, the performance requirements of narrow-band pulse OPA experiment for pump source are summarized through the experimental experience. Thirdly, based on the previous experiments, the commercial high-performance 1064 nm microcore laser and 1971 nm single-frequency thulium-doped fiber laser are used as the pump source and 1971 nm single-frequency thulium-doped fiber laser as seed source, and the effective 2 渭 m band is obtained by single-stage parametric amplification. The pulse energy of 1971.13 nm signal is 25 渭 J, the linewidth less than 82.7 pm,2313.62 nm is 17.8 渭 J, and the linewidth is less than 102.3 pm. The results show that this structure is a feasible way to obtain narrow-band near-mid-infrared pulse laser and has the potential to further improve the output power.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248;TN722
本文编号：2468593
[Abstract]:The optical parameter down-conversion technique based on second-order nonlinear optical effect is an effective way to obtain tunable frequency coherent optical radiation. Especially, the appearance of periodic polarized crystals in recent years provides another opportunity for the development of parametric light source. However, ordinary optical parametric oscillator (optical parametric oscillator,OPO) is affected by pump light width and parametric gain bandwidth. It is often in multi-longitudinal mode operation, and its output parametric light width is difficult to meet the needs of some applications, such as high-resolution spectral analysis. Therefore, in order to compress the spectrum of parametric light, seed injection OPO. has been developed. However, the complex feedback control system is often needed for seed injection into OPO, which not only makes it expensive, but also is not conducive to small integration and convenient use. Under this background, the possibility of using optical parametric amplifier (optical parametric amplifier,OPA) based on periodically polarized crystal to achieve narrow-band pulse parametric laser output is theoretically analyzed in this paper. The feasibility of the scheme is verified by the follow-up experiments. Compared with seed injection OPO, although this scheme has higher performance requirements for pump source, the whole experimental device has simple structure, no need of resonant cavity and complex control system, and can obtain good spectral compression effect at the same time. It is a new direction in the development of narrow linewidth parametric light source. The main work of this paper is as follows: 1. Through literature investigation, the research status at home and abroad is summarized and analyzed, and on the basis of normalized three-wave mixing coupled amplitude equations, numerical simulation of narrow-band OPA is carried out. It is verified by theoretical calculation that one-pass parametric amplification can obtain an effective narrow-band parametric optical output. The peak power of pump light, the average power of seed light and the corresponding crystal length are obtained in the experiment. It lays a theoretical foundation for the development of the follow-up experiments. Secondly, in order to carry out the near infrared narrow-band OPA experiment, the LBO-Nd:YAG intracavity frequency-doubled 532nm pulse laser is constructed as the pump source, and then the performance test of the 820 nm seed light output by the fiber coupling is carried out. Finally, the two-stage amplification is verified by the experiment. The output of near infrared narrow band OPA is obtained, and the average power of 280 mW and pulse energy of 140 渭 J are obtained. The light width of the output signal is 14.9 pm.. At the same time, the performance requirements of narrow-band pulse OPA experiment for pump source are summarized through the experimental experience. Thirdly, based on the previous experiments, the commercial high-performance 1064 nm microcore laser and 1971 nm single-frequency thulium-doped fiber laser are used as the pump source and 1971 nm single-frequency thulium-doped fiber laser as seed source, and the effective 2 渭 m band is obtained by single-stage parametric amplification. The pulse energy of 1971.13 nm signal is 25 渭 J, the linewidth less than 82.7 pm,2313.62 nm is 17.8 渭 J, and the linewidth is less than 102.3 pm. The results show that this structure is a feasible way to obtain narrow-band near-mid-infrared pulse laser and has the potential to further improve the output power.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248;TN722
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