5.4 W, 2.35 µm cascaded Raman fiber laser pumped by dissipative soliton resonance-like pulses

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Abstract
We present a nonlinear amplifying loop mirror-based mode-locked fiber laser. By adjusting the pump power, the proposed laser exhibits a dissipative soliton resonance (DSR)-like pulse operation with a maximum pulse width of 150 ns. Subsequently, a three-stage Tm3+-doped fiber amplifier is implemented using a single-mode double-cladding Tm3+-doped fiber to increase the DSR-like pulse output power to 52.5 W, achieving a pump slope efficiency of 47.1% in the main amplifier. A 25 m first-order Raman-gain fiber (UHNA7) is pumped by a DSR-like pulse, and 16.3 W of pure 2.135 µm first-order Raman light with a spectral purity of 73.4% is obtained. Finally, 5.4 W of 2.35 µm second-order Raman light with a spectral purity of 66% is obtained using a 10 m 98% germania-core fiber as a second-order Raman-gain fiber cascaded after UHNA7 fiber. To the best of our knowledge, this is the highest output power ever obtained from a 2.3 µm laser.
Funding Information
  • Shenzhen Pingshan District Science and Technology Innovation Fund (KY2022QJKCZ001, PSKG202003, PSKG202007)
  • Basic and Applied Basic Research Foundation of Guangdong Province (2023A1515111114)
  • Fundamental research project of Department of Education of Guangdong Province (2021ZDJS106)
  • National Key Research and Development Program of China (2022YFB3605800)
  • National Natural Science Foundation of China (62105225, 62275174)

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