强激光与粒子束
2023, 35(7): 071007
Author Affiliations
Abstract
1 State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
2 Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China
3 IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
4 Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900, China
5 Collaborative Innovation Center of Light Manipulation and Applications, Shangdong Normal University, Jinan 250358, China
At the surfaces of crystals, linear susceptibility tensors would differ from their counterparts in the interior of the bulk crystal. However, this phenomenon has not been shown in a visible way yet. In previous researches, numerous types of nonlinear Cherenkov radiation based on different materials have been studied, while linear Cherenkov radiation is barely reported. We experimentally prove the generation of linear Cherenkov radiation on the potassium dihydrogen phosphate (KDP) crystal surface and theoretically analyze its phase-matching scheme. In our study, o-polarized light and e-polarized light can mutually convert through the linear Cherenkov process. According to this result, we figure out new nonzero elements at off-diagonal positions in the linear susceptibility tensor matrix at crystal surfaces, compared with the normal form of a bulk KDP.
linear susceptibility Cherenkov-type harmonic generation crystal boundary Chinese Optics Letters
2021, 19(3): 031901
Author Affiliations
Abstract
1 Institute of Super-Microstructure and Ultrafast Process in Advanced Materials, School of Physics and Electronics, Central South University, Changsha 410083, China
2 Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900, China
In this Letter, a new method is presented to calculate the interactive length between the fundamental wave and second harmonic generation (SHG) for the configuration of total internal reflection on the inner surface of a nonlinear crystal. Three independent experiments are designed to measure the bandwidths of this second harmonic wave. The theoretical expression of the intensity of SHG is obtained through a nonlinear coupled wave equation. The interactive length of this phase-matched SHG can be calculated mathematically by utilizing the measured bandwidths and the intensity equation. There is no existing method to obtain the interactive length either from theoretical calculations or by experimental measurement. This method can be applied to estimate the extremely short interactive volume in nonlinear processes.
190.4410 Nonlinear optics, parametric processes 190.2620 Harmonic generation and mixing Chinese Optics Letters
2019, 17(8): 081902
Author Affiliations
Abstract
1 Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China
2 IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
3 Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900, China
Collinear phase-matching of sum-frequency generation (SFG) has been studied thoroughly previously, while non-collinear schemes are sometimes more flexible in application. However, this phase-matching type is more difficult to meet and control. We employ a convenient method to obtain harmonic generation in bulk potassium dihydrogen phosphate (KDP), using an incident wave vector and a reflected wave vector to create a triangle phase-matching relationship. With a simple, flexible set-up, we can observe 351 nm SFG, and the conversion efficiency is up to ~3.6% per reflection. Furthermore, we believe this approach has potential application value and improvement space.
140.3610 Lasers, ultraviolet 190.2620 Harmonic generation and mixing 190.4400 Nonlinear optics, materials Chinese Optics Letters
2019, 17(8): 081401
1 中国工程物理研究院应用电子学研究所, 四川 绵阳 621900
2 中国工程物理研究院研究生部, 北京 100088
报道了最大输出功率为1.3 W,波长为910~930 nm的单频、可调谐锥形半导体激光放大系统,研究了锥形半导体放大系统输出功率随注入电流和种子光功率的变化。功率为13.6 mW、波长为920 nm的单频种子光经隔离器和聚焦透镜后,功率减小为12.4 mW;入射到注入电流为4 A的锥形放大器中时,输出激光的功率可达1300 mW,增益达到20.21 dB,线宽为660 fm。当种子光功率从0增大到13.6 mW时,放大功率随之增大。该系统获得的激光可以用于四倍频后窄线宽连续可调谐中(深)紫外激光的研究。
激光光学 半导体激光器 锥形半导体放大器 光功率放大 单频可调谐激光 激光与光电子学进展
2018, 55(12): 121401
1 中国工程物理研究院 应用电子学研究所, 四川 绵阳 621900
2 中国工程物理研究院 研究生院, 北京 100088
3 中国工程物理研究院 高能激光科学与技术实验室, 四川 绵阳 621900
4 南开大学 物理科学学院, 天津 300071
5 南开大学 弱光非线性光子学教育部重点实验室, 天津 300457
6 山西大学 极端光学协同创新中心, 太原 030006
阐述了一种基于单块周期极化铌酸锂晶体级联三倍频实现440 nm蓝光输出的实验方案。根据周期极化铌酸锂晶体的Sellmeier方程以及倍频与和频的相位匹配条件,在一块周期极化铌酸锂晶体上设计了两段不同的极化周期,使其在同一工作温度下能分别实现倍频与和频,在先后经过倍频与和频后,实现级联三倍频输出。实验采用Nd:YAG产生的1319 nm光作为基频光,重频400 Hz,脉宽110 ns,横向和纵向光束质量因子分别为1.81和2.65。耦合进周期极化铌酸锂晶体后,出射光中检测到660 nm的红光和440 nm的蓝光。通过调整工作温度和入射基频光功率,得到2.4 mW的最大蓝光输出,此时工作温度55.5 ℃,基频光功率530 mW。实验结果验证了单块晶体实现级联三倍频440 nm蓝光输出的可行性。
固体激光器 级联三倍频 周期极化晶体 solid-state laser cascaded third-harmonic generation periodically poled crystal 强激光与粒子束
2018, 30(4): 041005
Author Affiliations
Abstract
1 State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
2 Key Laboratory for Laser Plasmas (Ministry of Education), Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
3 Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900, China
We observe conical sum-frequency generation in a bulk anomalous-like dispersion medium, which is attributed to complete phase-matching of one fundamental wave and the scattering wave of the other fundamental wave. In addition, efficient sum-frequency output is achieved making use of total internal reflection with conversion efficiency of 7.9% by only one reflection. The experiment proposes a new phase-matching mode under an anomalous-like dispersion condition, which suggests potential applications in efficient frequency conversion.
190.0190 Nonlinear optics 190.5890 Scattering, stimulated Chinese Optics Letters
2017, 15(12): 121901
Author Affiliations
Abstract
1 Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
2 Shanghai Institute of Laser Plasma, Shanghai, China
3 Key Laboratory for Laser Plasma (Ministry of Education), IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
4 e-mail: 5040729023@sjtu.edu.cn
5 China Academy of Engineering Physics, Mianyang, Sichuan 621900, China
We report on the experimental realization of Cerenkov sum-frequency generation across the material dispersion in a one-dimensional, periodically poled ferroelectric crystal. Three schemes of sum-frequency generation, confined only in the vicinity of domain walls and in the form of nonlinear Cerenkov radiation, are demonstrated in normal, degenerated, and anomalous-dispersion-like configurations. We exploit their phase-matching geometries, which exhibit a whole scenario of the evolution of Cerenkov radiation varying with the dispersion relationship among the interaction waves. In addition, two sets of conical sum-frequency generation with different radius and center are demonstrated, which result from scattering assistant phase-matching processes.
Upconversion Nonlinear optics Scattering Collection Of theses on high power laser and plasma physics
2015, 13(1): 106
Author Affiliations
Abstract
1 Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
2 Shanghai Institute of Laser Plasma, Shanghai, China
3 Key Laboratory for Laser Plasma (Ministry of Education), IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
4 e-mail: 5040729023@sjtu.edu.cn
5 China Academy of Engineering Physics, Mianyang, Sichuan 621900, China
We report on the experimental realization of Cerenkov sum-frequency generation across the material dispersion in a one-dimensional, periodically poled ferroelectric crystal. Three schemes of sum-frequency generation, confined only in the vicinity of domain walls and in the form of nonlinear Cerenkov radiation, are demonstrated in normal, degenerated, and anomalous-dispersion-like configurations. We exploit their phase-matching geometries, which exhibit a whole scenario of the evolution of Cerenkov radiation varying with the dispersion relationship among the interaction waves. In addition, two sets of conical sum-frequency generation with different radius and center are demonstrated, which result from scattering assistant phase-matching processes.
Upconversion Nonlinear optics Scattering Photonics Research
2015, 3(4): 106
1 上海交通大学物理系, 上海 200240
2 中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
通过研究畴壁切伦科夫倍频,发现畴壁存在巨大增强的非线性系数。由此造成的畴壁“定域性”使其可以对非线性极化波产生相速度调制,进而影响切伦科夫倍频。提出并证实了极限切伦科夫倍频的存在,并分析了它和准相位匹配倍频产生的区别。
非线性光学 铁电晶体畴壁 切伦科夫倍频 定域性 相速度调制