Influence of Stimulated Raman Scattering on Propagation Properties of High-Power Laser

Ye, 郑也 Zheng; Qingle, 倪庆乐 Ni; Lin, 张琳 Zhang; Xiaoxi, 刘小溪 Liu; Junlong, 王军龙 Wang; Xuefeng, 王学锋 Wang

doi:10.3788/cjl202148.0701005

Cited by 5 publications

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“…In recent years, due to the superior characteristics of low quantum defect, the favorable band structure of trivalent Ytterbium (Yb 3+ ) ions, and good beam quality, Yb-doped silica fibers have been considered the ideal amplifying medium for high-power fiber lasers and amplifiers [1][2][3][4][5][6]. Yb-doped fiber lasers have rapidly expanded their market shares in the commercial laser region and have been widely used in scientific research and industrial processing areas [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. For different working environments, the Yb-doped fiber lasers should be specially designed, such as satisfying the demands of anti-interference and anti-vibration requirements [15].…”

Section: Introductionmentioning

confidence: 99%

Influence of Pre-Radiation and Photo-Bleaching on the Yb-Doped Fiber Laser Radiated with Gamma-ray

et al. 2023

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To improve the radiation resistance of Yb-doped fiber lasers, we investigate the influence of pre-radiation and photo-bleaching on the gamma-radiated laser’s performance. When the gamma radiation dose is within 10 krad(Si) with a radiation dose rate less than 0.4 rad(Si)/s, compared to the output power of a non-pre-radiated Yb-doped fiber laser, the pre-radiation technique could enhance the radiation resistance against gamma-ray. However, the mode instability threshold was decreased, which was caused by the cumulated radiation-induced attenuation of pre-radiation and radiation. Based on an electronic probe micro-analyzer, the Yb-doped active fiber was Yb-doped aluminophosphosilicate ternary fiber; therefore, the radiated defects were mainly hole-related defects. A laser diode centered at 532 nm was chosen as the photo-bleaching laser source, which could recover 45.2% of the radiated-induced attenuation and increase the mode instability threshold. This work demonstrates the influence of pre-radiation and photo-bleaching on the radiation resistance against the gamma-ray of Yb-doped fiber lasers, which are of significance in the design and fabrication of related fiber lasers.

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Section: Introductionmentioning

confidence: 99%

Influence of Pre-Radiation and Photo-Bleaching on the Yb-Doped Fiber Laser Radiated with Gamma-ray

et al. 2023

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紧凑型光谱组束系统中光纤阵列扰动对光束质量的影响分析

Wang Yongneng,

Li Fujian,

Rao Daxing

et al. 2023

中国激光

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谱合成系统串扰及其对合束特性的影响

Yan Qingqing,

Zhong Zheqiang,

Zhang Bin

et al. 2023

中国激光

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Objective In diode laser array (DLA) gratingexternal cavity spectral beam combining (SBC) systems, the combining efficiency and beam quality are very important indicators. However, the beam crosstalk caused by imperfect factors including the divergence angle and deflection angle of DLA emitters results in the degradation of the output beam quality and combining efficiency. Therefore, to understand the physical mechanism of crosstalk in the roundtrip propagation of the beams in a DLA gratingexternal cavity SBC system and further analyze its influence on the performance of the SBC system , the relationship between the crosstalk and the combining efficiency or beam quality is established. In addition, the influences of key factors, including the DLA spacing, focal length of the lens, and line density of the grating, on the performance of the SBC system are analyzed.Methods To study the behavior of beam crosstalk and its influence on the performance of an SBC system , a roundtrip propagation model of a DLA is established. On this basis, by taking the semiconductor laser rate equation involving beam crosstalk injection into consideration, a physical model of combining efficiency of the SBC system is also developed. Furthermore, the influence of the divergence angle and deflection angle on the beam combining performance is studied using numerical calculations and statistical analysis. Results and DiscussionsWith only the divergence angle considered, there is no obvious crosstalk (Fig. 4). This is because the beam emitted by each emitter can be fed back to itself after being reflected by the external cavity. Even when the divergence angle increases to 12 mrad, the beam quality factor M 2 , beam combining efficiency η, and feedback intensity κ are not strongly affected by the divergence angle. With only the deflection angle considered, the feedback beam from the external cavity exhibits different degrees of deviation (Fig. 5). With an increase in the deflection angle, the feedback beam reflected to its own emitter decreases in intensity, whereas the feedback intensity from the other emitters increases, resulting in crosstalk. When the effects of the divergence and deflection angles are considered comprehensively, the feedback beam to the emitters deviates significantly, resulting in an obvious degradation of the output beam quality and combining efficiency (Fig. 6). For a given maximum divergence angle, the combining efficiency remains almost unchanged as the maximum deflection angle increases and then decreases sharply beyond a certain angle.The output beam quality exhibits the same trend. For a given maximum deflection angle, the beam combining efficiency remains almost unchanged up to a divergence angle of 12 mrad, whereas the beam quality decreases significantly. In addition, the DLA spacing, focal length of the lens, and line density of the grating have almost no influence on the combining efficiency with an increase in the maximum deflection angle up to a certain angle, after which the efficiency decreases dramatic...

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Influence of Stimulated Raman Scattering on Propagation Properties of High-Power Laser

Cited by 5 publications

References 0 publications

Influence of Pre-Radiation and Photo-Bleaching on the Yb-Doped Fiber Laser Radiated with Gamma-ray

Influence of Pre-Radiation and Photo-Bleaching on the Yb-Doped Fiber Laser Radiated with Gamma-ray

紧凑型光谱组束系统中光纤阵列扰动对光束质量的影响分析

谱合成系统串扰及其对合束特性的影响

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