Design and fabrication of wideband chirped tilted fiber Bragg gratings

Zhao, Xin; Tian, Xuemin; Wang, Meng; Li, Hongye; Rao, Binyu; Wang, Zefeng

doi:10.1016/j.optlastec.2021.107790

Cited by 10 publications

(5 citation statements)

References 18 publications

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“…The larger the loss rate of the CTFBG, the stronger the intensity of . However, the intensity of is usually below 20 dB [ 13 , 14 , 17 ] , and thus has a negligible effect on . Furthermore, mainly depends on two aspects.…”

Section: Design and Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The second method achieved a high SRS suppression rate by cascading several CTFBGs (multiple CTFBGs). However, this superimposes the insertion losses of individual CTFBGs, resulting in a significant increase in the insertion loss of multiple CTFBGs (>6%) [17] . Song et al [18] proposed a scheme of cascading multiple CTFBGs (multiplexed CTFBG) to achieve a loss rate of more than or equal to 25 dB and insertion loss of less than or equal to 3%.…”

Section: Introductionmentioning

confidence: 99%

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Mitigation of stimulated Raman scattering in a high-power fiber master oscillator power amplifier laser based on a dual-structure fiber grating

Jiao,

Kong,

Guo

et al. 2023

High Pow Laser Sci Eng

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With the increasing power of fiber lasers, single chirped and tilted fiber Bragg gratings (CTFBGs) cannot completely mitigate continuously enhanced system-excited stimulated Raman scattering (SRS). Although improving the loss rate of a single CTFBG or cascading multiple CTFBGs can provide better suppression of the stronger SRS, excessive insertion loss may cause significant attenuation of the output power. Confronting the challenge, we firstly present an SRS mitigation method based on a dual-structure fiber grating in this paper. The dual-structure fiber grating comprises a CTFBG and a fiber Bragg grating structure, which were designed and fabricated on a passive 25/400 double-clad fiber. To evaluate the performance of the grating, a 3 kW fiber master oscillator power amplifier laser is established. The experimental results demonstrate that the SRS mitigation rate of the grating is greater than 30 dB (99.9%), whereas the insertion loss is only approximately 3%, thus allowing for minimal deterioration of the output power. This solves the contradiction between high suppression rate and high insertion loss faced by CTFBGs, which in turn makes dualstructure fiber gratings particularly suitable for mitigating SRS in 3-5 kW high-power fiber lasers.

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Section: Design and Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mitigation of stimulated Raman scattering in a high-power fiber master oscillator power amplifier laser based on a dual-structure fiber grating

Jiao,

Kong,

Guo

et al. 2023

High Pow Laser Sci Eng

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“…Around the central wavelength ~ 13.2 THz downshift from pump wavelength corresponding to the peak Raman gain, the actual linewidth of Raman Stokes is relatively broad [333,335,399]. Thus, there is a problem that the rejection bandwidth of most of the CT-FBGs is not wide enough to cover the whole Raman spectral range at the highpower level, which results in ineradicable sidebands on both sides of the output spectrum [395,397,400]. To broaden the SRS suppression bandwidth of CT-FBGs, a simple tandem writing technique that inscribes two CT-FBGs with different inscription tilt angles has been reported, giving a 3 dB bandwidth of broader than 20 nm [400].…”

Section: Chirped and Tilted Fbg (Ct-fbg) And Long Period Fbg (Lp-fbg)...mentioning

confidence: 99%

“…However, CT-FBGs have some drawbacks such as timeconsuming pretreatment and back-propagating light caused by Bragg reflection, which may seriously affect the laser output power, efficiency and beam quality [401]. Hence, the transmission grating, i.e., LP-FBG [390,393,394,[396][397][398][399][400][401][402][403][404][405], may be a better alternative. LP-FBG can eliminate SRS band by coupling the Stokes light from the core mode to the forward cladding mode, through which the reflected light could be effectively avoided [404], as illustrated in Fig.…”

Section: Chirped and Tilted Fbg (Ct-fbg) And Long Period Fbg (Lp-fbg)...mentioning

confidence: 99%

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

et al. 2022

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The success of high-power fiber lasers is fueled by maturation of active and passive fibers, combined with the availability of high-power fiber-based components. In this contribution, we first overview the enormous potential of rare-earth doped fibers in spectral coverage and recent developments of key fiber-based components employed in high-power laser systems. Subsequently, the emerging functional active and passive fibers in recent years, which exhibit tremendous advantages in balancing or mitigating parasitic nonlinearities hindering high-power transmission, are outlined from the perspectives of geometric and material engineering. Finally, novel functional applications of conventional fiber-based components for nonlinear suppression or spatial mode selection, and correspondingly, the high-power progress of function fiber-based components in power handling are introduced, which suggest more flexible controllability on high-power laser operations. Graphical abstract

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