High Power Laser Science and Engineering (Jan 2024)

A 1.8 kW high power all-fiber Raman oscillator

  • Chenchen Fan,
  • Xiulu Hao,
  • Yang Li,
  • Min Fu,
  • Zilun Chen,
  • Tianfu Yao,
  • Jinyong Leng,
  • Pu Zhou

DOI
https://doi.org/10.1017/hpl.2024.63
Journal volume & issue
Vol. 12

Abstract

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Fiber Bragg grating-based Raman oscillators are capable of achieving targeted frequency conversion and brightness enhancement through the provision of gain via stimulated Raman scattering across a broad gain spectrum. This capability renders them an exemplary solution for the acquisition of high-brightness, specialized-wavelength lasers. Nonetheless, the output power of all-fiber Raman oscillators is typically limited to several hundred watts, primarily due to limitations in injectable pump power and the influence of higher-order Raman effects, which is inadequate for certain application demands. In this study, we introduce an innovative approach by employing a graded-index fiber with a core diameter of up to 150 μm as the Raman gain medium. This strategy not only enhances the injectable pump power but also mitigates higher-order Raman effects. Consequently, we have successfully attained an output power of 1780 W for the all-fiber Raman laser at 1130 nm, representing the highest output power in Raman fiber oscillators with any configuration reported to date.

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