High-Efficiency Ignition Laser Source Based on Diode Laser Beam Combination Technology

doi:10.3788/CJL202249.0701002

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	High-Efficiency Ignition Laser Source Based on Diode Laser Beam Combination Technology
	H. Jinliang; Z. Jun; S. Xiaonan; P. Hangyu; Q. Li and W. Lijun
	2022
发表期刊	Zhongguo Jiguang/Chinese Journal of Lasers
ISSN	02587025
卷号	49 期号:7
摘要	Objective Recently, with the rapid development of diode lasers, it has been widely used in industrial processing, aerospace, military, and other fields, especially in ignition and detonation fields because of its unique advantages, such as small size, high efficiency, wide wavelength range, and high reliability. The traditional electric ignition technology generates heat to detonate the gunpowder through the thermal resistance wire. However, this method has potential risks, such as electrostatic discharge and electromagnetic radiation. Additionally, it is difficult to apply to the complex environmental changes of the modern battlefield. Laser ignition technology has been proved to be a proper solution to the above problems. This technology transforms the energy generated by the laser into heat energy to detonate the gunpowder. It has better antistatic interference and antielectromagnetic interference ability to ensure the reliability and safety of the explosive device than traditional technologies. Although laser ignition technology has great application advantages, it has strict requirements for power and power density of laser beams. Additionally, the ignition light source needs to adopt a series of optical components, such as a collimating lens, focusing lens, and optical fiber. Once the microlens deforms or the optical fiber bends, it will influence the laser power; thereby, damaging the equipment. Therefore, the laser ignition system must be equipped with the optical path self-inspection function, and the operation of self-inspection must be performed before working to ensure the system's reliability and stability. Methods This paper proposes a high-efficiency laser ignition source. First, we design an optical structure of single fiber and dual-wavelength output. A high-power 976 nm ignition and low-power of 1310 nm detection lasers are simultaneously coupled into a 105 m/NA 0. 22 optical fiber using space and wavelength combining techniques. Simulation results of the ZEMAX optical design software verify the feasibility of the solution. Second, the laser beam divergence angle and beam size are reduced effectively using a self-focusing lens. The laser power density and ignition efficiency improve significantly under the same distance condition. Additionally, the reduction of the laser divergence angle effectively avoids the problem that the reflectivity of the laser is random when it is irradiated to the window mirror of the gunpowder. Thus, the quantitative criterion of the continuity detection of the optical path is more accurate. Finally, aiming at the critical detection function of the ignition laser system, the optical path self-inspection and synchronous output power self-inspection of high-power ignition laser can be achieved using spectroscope coating film and optical path structure. This can meet the application requirements of high efficiency and reliability of ignition laser source in this field. Results and Discussions The photo of the diode laser ignition light source is shown in Fig. 5. When the operating current is set to 12 A, and the operating voltage is 2 V, the free-running output power of the 976 nm ignition laser is 12.05 W. After the beam shaping and fiber coupling, the output power from the fiber is 10.92 W, and the fiber coupling efficiency reaches 90. 62 %. A laser beam is measured at a distance of 80 mm from the luminous surface before and after self-focusing lens shaping (Fig. 7). After self-focusing lens shaping, the divergence angle of the laser becomes smaller, and the beam size of the laser transmitted at the same distance also becomes smaller. Consequently, the optical power density increases significantly at the same power. We measure the power of 1310 nm detection light and PD responsiveness under different operating current conditions. When the operating current is set to 15 mA, the output power measured after fiber coupling is 1.08 mW, and the voltage is maintained at 1 V, which meets the application requirements of output power from fiber higher than 1 mW. The response photo urrent of PD through the spectroscope is shown in Fig. 9(b). The response current of PD to 1310 nm laser increases linearly with good consistency through this beam combination structure. We also measure the photocurrent response of 1310 nm laser after fiber coupling. According to the curve, the responsivity is about 0.82, and it has a good consistency. Combining with the PD response results before coupling, we can judge whether there is a problem with the optical power of detecting laser and the optical path of the ignition system. The 976 nm laser reflected by the spectroscope is fed back by PD, and the operating ignition laser power is put into the system. This can be determined from the corresponding relationship between the photocurrent of PD response and the laser injection current. The response current of PD to the 976 nm ignition laser increases linearly (Fig. 10). Conclusions An optical structure with a single fiber dual-wavelength output and self-inspection function is designed using spatial combining, wavelength beaming, and beam shaping techniques. We obtain a 976 nm ignition laser with an output power greater than 10 W and a 1310 nm detection laser with an output power greater than 1 mW. The structure can simultaneously realize the power and optical path self-inspection of 976 nm ignition and 1310 nm detection laser. The divergence angle and beam size of the laser are effectively reduced using a self-focusing lens. This can improve laser power density and solve the randomness problem of the PD detector. It is crucial to realize the quantitative detection of optical detection system feedback and improve the effectiveness of the optical path continuity testing. 2022 Science Press. All rights reserved.
DOI	10.3788/CJL202249.0701002
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收录类别	ei
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/66714
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	H. Jinliang,Z. Jun,S. Xiaonan,et al. High-Efficiency Ignition Laser Source Based on Diode Laser Beam Combination Technology[J]. Zhongguo Jiguang/Chinese Journal of Lasers,2022,49(7).
APA	H. Jinliang,Z. Jun,S. Xiaonan,P. Hangyu,&Q. Li and W. Lijun.(2022).High-Efficiency Ignition Laser Source Based on Diode Laser Beam Combination Technology.Zhongguo Jiguang/Chinese Journal of Lasers,49(7).
MLA	H. Jinliang,et al."High-Efficiency Ignition Laser Source Based on Diode Laser Beam Combination Technology".Zhongguo Jiguang/Chinese Journal of Lasers 49.7(2022).

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