365赌球

王金艳; 马放; 郑磊; 田东贺; 陈曦; 郑权

doi:10.37188/CO.2023-0058

365赌球

doi: 10.37188/CO.2023-0058

王金艳 ^1,,
马放 ¹,
郑磊 ¹,
田东贺 ¹,
陈曦 ^1,,,
郑权 ^{1, 2}

1.
长春新产业光电技术有限公司, 吉林长春 130103
2.
中国科学院长春光学精密机械与物理研究所, 吉林长春 130033

基金项目:长春市科技发展计划重点研发专项（No. 21ZGG15）

详细信息

作者简介:
王金艳（1988—），女，吉林长春人，高级工程师，2013年于长春理工大学获得光学硕士学位，现任职于长春新产业光电技术有限公司，主要从事固体激光器技术与应用方面的研究。 Email：[email protected]

陈　曦（1985—），女，吉林长春人，高级工程师，2012年于长春理工大学获得光学硕士学位，现任职于长春新产业光电技术有限公司，主要从事固体激光器技术与应用方面的研究。 E-mail：[email protected]

中图分类号:TN248.1
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365赌球最新网址
- 网络出版日期: 2023-07-13

365赌球

WANG Jin-yan ^{1
,},
MA Fang ¹,
ZHENG Lei ¹,
TIAN Dong-he ¹,
CHEN Xi ^{1
,,},
ZHENG Quan ^{1, 2}

1.
Changchun New Industries Optoelectronics Tech. Co., Ltd., Changchun 130103, China
2.
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of science, Changchun 130033, China

Funds:Supported by

More Information

Corresponding author: [email protected]

摘要

摘要:
紫外激光器是研究紫外共振拉曼光谱的重要工具，拉曼信号可以通过共振拉曼效应得到增强，提高拉曼测量的探测极限。本文研究了一种输出波长为228 nm的窄脉宽全固态紫外激光器。首先，以Nd:YVO₄作为增益介质，采用电光调Q腔倒空技术，实现纳秒量级914 nm基频光输出。然后经过偏硼酸锂(LBO)晶体产生二次谐波，最终经偏硼酸钡(BBO)晶体获得四次谐波228 nm紫外激光。研究了不同重复频率时基频光和倍频光功率的变化规律，优化了紫外激光的输出效率。当总抽运功率为30W时，在10kHz重复频率下，获得最高平均功率为84 mW的228 nm紫外激光输出。228 nm激光在5 kHz~25 kHz重复频率范围内连续可调，脉冲宽度保持在2.8~2.9 ns。能够满足紫外光谱检测技术领域的应用需求。
- 228 nm激光器 /
- 紫外激光 /
- 腔倒空技术 /
- 二次谐波
Abstract:
Ultraviolet lasers play an important role in the study of ultraviolet resonance Raman spectroscopy. The Raman resonant Raman effect enhance Raman signals and reduces the detection limit of Raman measurement. This paper focuses on the study of an all-solid-state deep-ultraviolet laser with an output wavelength of 228 nm. The laser uses Nd:YVO₄ as a gain medium and electro-optic q-switched cavity dumping technique to achieve a fundamental frequency output of 914 nm in pulse widths of several nanoseconds. Then, the second-harmonic generation is achieved by LiB₃O₅(LBO), and the fourth-harmonic 228 nm UV laser is obtained by beta-barium-borate (BBO). The variation of fundamental and second harmonic laser power at different repetition rates is investigate. The average power of Nd:YVO₄ is saturated and decreases with increased repetition rate due to the low gain at 914 nm. The output efficiency of UV laser is optimized by adjusting the focus lens. At the pump power of 30 W, the highest average power of a 228nm UV laser is 84 mW at 10 kHz. The repetition rate of UV laser is continuously adjustable within the range of 5 kHz−25 kHz, and the pulse width is maintained at 2.8 to 2.9 ns which meets the application requirements in the field of UV spectroscopy detection technology.
- 228 nm laser /
- deep ultraviolet laser /
- cavity dumped laser /
- second harmonic generation

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图 1 Nd³⁺离子跃迁能级图

Figure 1. Nd³⁺ ion transition energy-level diagram

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图 2 914 nm基频光实验装置示意图

Figure 2. Experimental setup of 914 nm fundamental frequency laser

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图 3 简化谐振腔示意图

Figure 3. Schematic diagram of a simple resonant cavity

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图 4 不同腔长时，晶体内基模半径随抽运功率的变化

Figure 4. Variation of the the fundamental mode radius in crystals with different cavity length and pump power

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图 5 228 nm激光实验装置

Figure 5. 228 nm laser experimental setup

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图 6 914nm激光的平均功率与脉冲能量

Figure 6. Average output power and peak power at different repetition rate for 914nm laser

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图 7 457nm激光的平均功率与脉冲能量

Figure 7. Average output power and the peak power at different repetition rate for 457nm laser

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图 8 228 nm光谱测试图

Figure 8. Spectrum of 228 nm laser

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图 9 228 nm激光平均功率与脉宽随频率的变化

Figure 9. Average output power and pulse width of 228 nm laser at different repetition rate

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图 10 228 nm激光功率稳定性

Figure 10. Power stability of 228 nm laser

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图 11 288 nm输出脉冲序列和脉宽：(a)、(b)分别为10 kHz时的脉冲序列和脉宽；(c)、(d)分别为18 kHz时的脉冲序列和脉宽

Figure 11. Oscilloscope traces of pulse trains and pulse width of 228 nm laser：(a), (b) Pulse trains and pulse width at 10 kHz respectively; (c), (d) Pulse trains and pulse width at 18 kHz respectively

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图 12 紫外激光光斑强度分布图：(a)二维空间强度分布；(b)三维空间强度分布；(c)水平方向强度分布；(d)竖直方向强度分布

Figure 12. Spot intensity distribution diagram of ultra-violet laser: (a) Two-dimensional spatial intensity distribution; (b) Three-dimensional spatial intensity distribution; (c) Horizontal intensity distribution; (d) Vertical intensity distribution

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