大芯径集束光纤强激光耦合装置设计

魏少强; 李云飞; 张钧尧; 魏永杰

doi:10.5768/JAO202344.0610007

大芯径集束光纤强激光耦合装置设计

doi: 10.5768/JAO202344.0610007

魏少强^{1, 2,},
李云飞^{1, 2},
张钧尧^{1, 2},
魏永杰³

1.
核工业理化工程研究院激光技术研究所，天津 300180
2.
粒子输运与富集技术重点实验室，天津 300180
3.
河北工业大学机械工程学院，天津 300130

基金项目: 天津市自然科学基金（18JCTPJC56600）

详细信息

作者简介:
魏少强（1987—），男，硕士，工程师，主要从事可调谐激光技术研究。Email：619549110@qq.com

中图分类号: TN248
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- 被引次数: 0
出版历程
- 收稿日期: 2023-04-17
- 修回日期: 2023-09-27
- 网络出版日期: 2023-10-23
- 刊出日期: 2023-11-22

Design of strong laser coupling device for large core diameter bunched fiber

WEI Shaoqiang^{1, 2
,},
LI Yunfei^{1, 2},
ZHANG Junyao^{1, 2},
WEI Yongjie³

1.
Research Institute of Laser Technology, Research Institute of Physical and Chemical Engineering of Nuclear Industry, Tianjin 300180, China
2.
Science and Technology on Particle Transport and Separation Laboratory, Tianjin 300180, China
3.
School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China

摘要

摘要: 光纤传输是常用的激光传输方式，随着光纤制备工艺的提升，大芯径、大数值孔径的传能光纤被广泛应用于多模激光传输。高效的激光耦合是光纤稳定传输的前提，为实现宽波段、高功率密度的激光耦合，根据混合模类高斯光束传输变换特性和耦合装置初始参数，结合像差分析，设计了一套大芯径四合一集束光纤与单芯光纤之间的非球面镜耦合装置，并通过机械装置装调实验得到了最高60.6%的光纤耦合效率。搭配自研激光共振电离飞行时间质谱仪，实现了钕同位素三色三步光电离路径对应激光饱和功率密度的测量，验证了装置满足复色激光共振激发电离特定同位素的光谱实验需求。
- 大芯径光纤耦合 /
- 类高斯光束 /
- 非球面透镜 /
- 像差分析
Abstract: Fiber transmission is a common mode of laser transmission, with the improvement of optical fiber preparation technology, energy transfer fiber with large core diameter and large numerical aperture is widely used in multi-mode laser transmission. Efficient laser coupling is the premise of stable transmission of optical fiber, in order to achieve laser coupling with wide band and high power density, according to the transmission transformation characteristics of mixed-mode Gaussian-like beam and the initial parameters, combined with aberration analysis, an aspherical lens coupling device between large-core four-in-one bunched fiber and single-core fiber was designed, and the maximum fiber coupling efficiency of 60.6% was obtained through mechanical installation experiments. Coupled with a self-developed laser resonance ionization time of flight mass spectrometer, the laser saturation power density corresponding to the three-color, three-step photoionization path of neodymium isotope was measured, and it was verified that the device could meet the spectral experiment requirements of specific isotope resonance excitation ionization induced by complex lasers.
- large-core fiber coupling /
- Gaussian-like beam /
- aspherical lens /
- aberration analysis

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图 1 光纤耦合装置示意图

Fig. 1 Schematic diagram of optical fiber coupling device

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图 2 几何光束聚焦模型

Fig. 2 Focusing model of geometric beam

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图 3 Code V软件优化图

Fig. 3 Code V software optimized diagram

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图 4 耦合装置机械调整结构

Fig. 4 Structure diagram of mechanical adjustment for coupling device

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图 5 多步光电离路径的激光饱和功率密度扫描曲线

Fig. 5 Laser saturation power density scanning curve of multi-step photoionization path

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表 1 非球面方程各系数值

Table 1 Coefficient values of aspheric equation

Lens	R	K	A	B	C	D	E	F	G	H	J
Collimating lens	31.20	1.05	−8.32×e⁻⁶	1.07×e⁻⁸	1.68×e⁻⁹	1.01×e⁻¹¹	−5.29×e⁻¹⁴	−2.41×e⁻¹⁵	−3.66×e⁻¹⁷	−1.64×e⁻¹⁹	1.15×e⁻²⁰
Focusing lens	20.50	−1.00	−1.22×e⁻⁵	9.09×e⁻⁸	4.57×e⁻¹⁰	2.04×e⁻¹²	−4.04×e⁻¹⁴	−7.88×e⁻¹⁶	7.80×e⁻¹⁸	0.00	0.00

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表 2 耦合装置实验结果

Table 2 Experimental results of coupling device

Wavelength /nm	Laser power /W	4-in-1 fiber output power/W	Single-core fiber output power/W	Efficiency /%	Input core/µm
567	1.17	1.10	6.57	60.6	365
567	1.00	0.94			365
580	3.50	3.40			550
641	6.00	5.40			550

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