1 中国科学院福建物质结构研究所光电材料化学与物理重点实验室, 福建 福州 350002
2 中国科学院大学, 北京 100049
3 福州大学化学学院, 福建 福州 350108
精确的简并范围是运用横模频率简并原理产生结构光场的重要条件。本文基于激光频谱研究了共焦腔处于1/2简并态时激光横模频率简并的现象,并提出一种更准确的简并范围测量方法。实验中详细观测输出激光频谱信号随腔长的变化。利用频谱信息,实现了对腔内不同阶横模在发生简并时动力学行为变化的监测。研究结果表明,当腔内不同阶横模发生频率简并时,不同简并族的横模未因模式竞争被抑制,而是共存于腔内。同时,利用激光频谱随腔长的变化,实现了对简并范围更准确的测量。简并过程中重点监测的两个频率信号随着腔进入简并态合并成一个频率信号,该状态在一段腔长范围内稳定存在。据此测得更精确的简并范围,对应腔长约为0.20 mm。此外,对实验中测得的频谱信号进行理论对比,频谱信号的实验值与理论值基本吻合。
激光器 横模 频谱 简并 简并范围 中国激光
2021, 48(20): 2001003
1 福州大学化学学院, 福建 福州 351100
2 中国科学院福建物质结构研究所, 福建 福州 351100
3 中国科学院上海硅酸盐研究所, 上海 200000
4 福建师范大学化学与材料学院, 福建 福州 351100
报道了基于a切Er,Yb∶YAl3(BO3)4晶体的被动调Q微片激光器的性能。使用波长为976 nm的光纤耦合半导体二极管作为端面抽运光源,使用初始透过率为96%的Co 2+∶MgAl2O4晶体作为可饱和吸收体,耦合输出镜在1500~1600 nm波段范围的透过率为2.5 %,整个微片激光器的腔长为2.7 mm。在注入功率为7.2 W 时,激光器成功得到了发射波长为1530 nm、重复频率为127 kHz的稳定线性偏振的脉冲输出,对应的脉冲能量和脉冲宽度分别为1.8 μJ和12 ns。
大气光学 a切Er Yb∶YAl3(BO3)4晶体; Co
2+∶ MgAl2O4晶体; 被动调Q 微片激光器 线性偏振 中国激光
2021, 48(13): 1301004
Author Affiliations
Abstract
1 Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
2 Fuzhou University, Fuzhou 350002, China
3 Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China
4 Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
5 Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Device, Fuzhou 350108, China
End-pumped by a 976 nm diode laser, a high-repetition-rate microchip laser passively Q-switched by a crystal is reported. At a quasi-continuous-wave pump power of 20 W, a 1553 nm passively Q-switched laser with the repetition rate of 544 kHz, pulse duration of 8.3 ns, and pulse energy of 3.9 μJ was obtained. To the best of our knowledge, the 544 kHz is the highest reported value for the 1.5 μm passively Q-switched pulse laser. In the continuous-wave pumping experiment, the maximum repetition rate of 144 kHz with the pulse duration of 8.0 ns and pulse energy of 1.7 μJ was obtained at the incident pump power of 6.3 W.
1.5?μm microchip laser passive Q-switching Er:Yb:YAl34 crystal high-repetition-rate laser pulse Chinese Optics Letters
2021, 19(7): 071402
Author Affiliations
Abstract
1 College of Chemistry, Fuzhou University, Fuzhou 350108, China
2 Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
3 Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China
4 University of Chinese Academy of Sciences, Beijing 100049, China
5 Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Fuzhou 350108, China
The behavior of self-polarization emission in lasers has been proved in some cases. However, the degree and direction of polarization were often sensitive and unstable. We experimentally observed different beam profiles versus the angle of the polarizer relative to the polarization direction of the laser. In order to explore the polarization mechanism, the dynamics of intracavity polarized eigenmodes was analyzed theoretically. Simulative results were well consistent with our experimental observations. It indicated that the linear self-polarization emission was a composite state rather than an intrinsic state. This study contributed to the improvement of the polarization stability in passively Q-switched lasers.
self-polarization emission polarized eigenmodes coherent combination Chinese Optics Letters
2021, 19(2): 021401
1 中国科学院福建物质结构研究所, 福州 350102
2 中国福建光电信息科学与技术创新实验室(闽都创新实验室), 福州 350108
3 长江大学, 荆州 434023
为测定粉末材料的紫外波段二阶非线性光学特性, 根据Kurtz-Perry粉末倍频效应理论, 开展了紫外粉末二阶非线性光学性能测试的研究。测试光源为氙灯泵浦的Nd∶YAG-KTP电光调Q激光器, KTP为二倍频晶体, 输出波长532 nm, 单脉冲能量100 mJ, 重复频率1~10 Hz, 脉冲宽度为8 ns。为保证266 nm光的透过率, 采用紫外融石英做窗口片, 型号为JGS1; 为保证测试的准确性, 选择光栅光谱仪分光。经紫外常用的KDP、LBO、BBO等测试, 证明本方法具有稳定可靠、判别精度高、操作简单等优点, 可以有效地定性或半定量测试材料的紫外二阶非线性光学性能, 为研究紫外二阶非线性光学材料提供了一种重要的测试手段。
二阶非线性光学 紫外 粉末 second-order nonlinear optic UV powder
Author Affiliations
Abstract
1 Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Institute of Optoelectronic Engineering, Jinan University, Guangzhou 510632, China
We observe a nonlinear response of a dual-wavelength Nd:YAG laser when subjected to low-frequency periodic modulations of cavity losses. The modulation frequency is far from the relaxation oscillation frequency. The harmonic resonances of the two laser wavelengths associated with antiphase intensity oscillations are demonstrated and resonances up to the fourth order were observed. For relatively weak modulation, the intensity oscillation frequency of the laser is equal to the modulation frequency. Harmonic resonances occur under a stronger modulation. We find that more harmonic components appear when the modulation frequency is increased. Furthermore, with enhancing the modulation, the dominant frequency of the intensity oscillations of both wavelengths is shifted toward the higher-order harmonic frequency.
140.3425 Laser stabilization 140.3480 Lasers, diode-pumped 190.2640 Stimulated scattering, modulation,etc. Chinese Optics Letters
2016, 14(1): 011403
1 福州大学 材料科学与工程学院, 福州 350108
2 中国科学院 福建物质结构研究所, 福州 350002
腔内反射增强技术可有效提高紫外激光四倍频效率,但反射增强腔存在多次反射光斑不重合、光束发散角不一致的问题。为了获得更好的光束质量, 设计了一种实现多次反射绿光光束可重现的反射腔结构, 采用传输矩阵法计算了反射光束及四倍频转换等参量。结果表明, 可重现的反射腔不仅能有效避免反射增强腔内光束半径不一致导致的光束质量差的问题, 还可进一步提升四倍频效率。
激光光学 四倍频 反射增强腔计算 反射光束重现 laser optics fourth harmonic generation reflective enhanced cavity calculation reproduction of reflected beam
