Spectral Beam Combining of Fiber Lasers by Using Reflecting Volume Bragg Gratings

Zhou, Taidou; Liang, Xiaobao; Li, Chao; Zhao, Lei; Wang, Jianjun; Feng, Jing

doi:10.1088/0256-307x/33/12/124205

Cited by 7 publications

(2 citation statements)

References 19 publications

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“…[1][2][3][4][5] To match the diverse demand of those applications, it is highly desired to improve the spectral purity and to extend the operation wavelength of high-power fiber lasers. For example, the spectral purity and operation wavelength are critical in the applications of spectral beam combination [6,7] and nonlinear frequency conversion. [8] Unfortunately, the power scaling of single-mode fiber lasers is currently limited by the multiple restrictions of pump brightness, stimulated Raman scattering (SRS), and transverse mode instability (TMI).…”

Section: Introductionmentioning

confidence: 99%

Impact of amplified spontaneous emission noise on the SRS threshold of high-power fiber amplifiers

Liu¹,

Ren²,

Ma³

et al. 2023

Chinese Phys. B

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Impact of amplified spontaneous emission (ASE) noise on the stimulated Raman scattering (SRS) threshold of high-power fiber amplifiers is demonstrated numerically through a spectral evolution approach. The simulation results confirm that ASE noise among the Raman wavelength band could reduce the SRS threshold of high-power fiber amplifiers significantly. As for ASE noise originated the main amplifier, it becomes stronger and reduces the SRS threshold at shorter operation wavelength below 1052 nm. As for ASE noise originated from the seed laser, it reduces the SRS threshold at different operation wavelength on the condition that the Raman ratio is over -90 dB in the seed laser. The theoretical method and results in this work could provide a well reference to extend the operation wavelength of high-power fiber lasers.

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Section: Introductionmentioning

confidence: 99%

Impact of amplified spontaneous emission noise on the SRS threshold of high-power fiber amplifiers

Liu¹,

Ren²,

Ma³

et al. 2023

Chinese Phys. B

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“…Zhou et al reported the modulation of combined beam characteristics by volume Bragg gratings with thermal deformation. The transmitted and the diffracted beams experience wave-front aberrations with different degrees, thus leading to distinct beam deterioration [16]. Yang et al presented the influence of multilayer dielectric grating thermal deformation on the SBC system and the beam quality of the combined beam degraded with increasing incident laser-beam power density [17].…”

Section: Introductionmentioning

confidence: 99%

Dynamic of Grating Thermal Deformation on Beam Quality for Spectral Beam Combining

Deng

Zhan

et al. 2022

Front. Phys.

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For spectral beam combining, an experimental system of dynamic beam quality caused by the thermal deformation of a grating has been designed and established. According to the theoretical model established, the distribution of the temperature field, as well as the thermal deformation of the grating, has been analyzed. Further, the combined beam quality and the intensity distribution have been numerically calculated in detail. The results show that the maximum temperature and the grating thermal deformation increase with the extension of irradiation time, resulting in side lobes appearing in the intensity distribution. In the experiment, the measured combined beam quality factor Mx2 was 1.29 without the thermal deformation. When the grating was heated by pump lasers at different times, Mx2 can arrive at 1.34, 1.37, and 1.41, respectively. The results reveal that the combined beam quality increases with the increase in irradiation time and changes rapidly at the beginning of heating, consistent with the theoretical analysis. The discussion and analysis of the dynamic beam quality are potentially valuable for reducing the influence of thermal deformation on the beam quality.

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Thermal analysis of multilayer dielectric grating with high power laser irradiation

Wang

Yuan

et al. 2020

AIP Advances

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We have established a thermal distribution model of the multilayer dielectric grating with laser irradiation based on the Beer–Lambert theory and the thermal conduction theory. The temperature change on the surface and inside of the grating is simulated according to the laser irradiation time, laser power, substrate size, and substrate material. The actual thermal behavior of a 50 × 50 × 10 mm3 multilayer dielectric grating with fused silica substrate is measured with 10 kW fiber laser irradiation. The results show a dynamic equilibrium between the energy absorbed in the laser irradiation area and the energy transferred in the thermal transfer area when the maximum temperature of the grating is kept stable. The simulation results are in good agreement with the experimental data, which provides a reference for understanding the thermal dynamics process of the multilayer dielectric grating with high power density laser irradiation.

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Spectral Beam Combining of Fiber Lasers by Using Reflecting Volume Bragg Gratings

Cited by 7 publications

References 19 publications

Impact of amplified spontaneous emission noise on the SRS threshold of high-power fiber amplifiers

Impact of amplified spontaneous emission noise on the SRS threshold of high-power fiber amplifiers

Dynamic of Grating Thermal Deformation on Beam Quality for Spectral Beam Combining

Thermal analysis of multilayer dielectric grating with high power laser irradiation

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