Stimulated Raman scattering is an important factor limiting the further improvement of the output performance of high-power fiber lasers. Long-period fiber bragg grating (LPFG) has been demonstrated as an effective component for suppressing Stimulated Raman Scattering (SRS) in high-power fiber lasers. The LPFG with a wide rejection bandwidth is expected to provide more an efficient suppression of SRS. In this study, we experimentally validate a simple cascaded inscription method for achieving wideband LPFGs. A fiber laser oscillator with a low SRS threshold and several comparative experiments are conducted to evaluate the performance of LPFGs. Unlike the general fiber filter that can only suppress SRS intensity, a novel shift in the output spectra indicate the effectiveness of cascaded LPFGs (CLPFGs) in SRS suppression.

Conflicts of Interest

The authors declare no conflicts of interest.

Open Research

Data Availability Statement

The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.

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Volume67, Issue8

August 2025

e70318

Effective Inhibition of Stimulated Raman Scattering in Fiber Oscillator by Wide Bandwidth Long-Period Fiber Gratings

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Conflicts of Interest

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Data Availability Statement

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Effective Inhibition of Stimulated Raman Scattering in Fiber Oscillator by Wide Bandwidth Long-Period Fiber Gratings

ABSTRACT

Conflicts of Interest

Open Research

Data Availability Statement

References

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