Experimental investigation of high-power broadband all-fiber nanosecond superfluorescent source

Ning, Chaoyu; Zou, Shuzhen; Yu, Haijuan; He, Chaojian; Dong, Zhiyong; Miao, Zhangwang; Chen, Xuechun; Xu, Shuang; Zuo, Jiexi; Li, Xinyao; Lin, Xuechun

doi:10.1016/j.optlastec.2023.110354

Optics & Laser Technology

2024

DOI: 10.1016/j.optlastec.2023.110354

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Experimental investigation of high-power broadband all-fiber nanosecond superfluorescent source

Chaoyu Ning,

Shuzhen Zou,

Haijuan Yu

et al.

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Cited by 2 publications

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Over 10‐W, 2.0‐μm, Broadband, All‐Fiber Amplified Spontaneous Emission Source Based on Spectrum Combination

Ding,

Zhai,

Ouyang

et al. 2024

Advanced Photonics Research

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Herein, Tm‐doped fiber (TDF) amplified spontaneous emission (ASE) and Ho‐doped fiber ASE to realize a high‐power, 2.0‐μm‐broadband, all‐fiber ASE source are combined. By in‐band pumping the Ho‐doped fiber ASE with TDF ASE, an output power of 17.7 W is achieved. Subsequently, a 1500–1970/1980–2200‐nm wavelength division multiplexer is utilized to combine the Tm‐doped and Ho‐doped fiber ASE sources. The combined ASE source exhibits a maximum output power of 10.9 W, a full width at half maximum of 67 nm, a spectral range of 1910–2086 nm, a root–mean–square power fluctuation of 0.17% in 30 min, no self‐pulsing, and no self‐excited oscillation. To the best of knowledge, such a high output power has not been previously reported for Ho‐doped fiber ASE sources and 2.0‐μm‐broadband all‐fiber ASE sources. Thus, spectrum combination can effectively yield a high‐power fiber ASE source with a broad bandwidth.

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Over 10‐W, 2.0‐μm, Broadband, All‐Fiber Amplified Spontaneous Emission Source Based on Spectrum Combination

Ding,

Zhai,

Ouyang

et al. 2024

Advanced Photonics Research

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High repetition frequency tunability active Q-switched all-fiber laser by multi-gain sub-rings smoothing multipeak pulse and suppressing ASE self-saturation

Chen,

Wang,

et al. 2024

Opt. Express

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This paper provides a method to effectively suppress the severe ASE self-saturation when achieving high repetition frequency tunability with high output power and narrow pulse width in active Q-switched all-fiber lasers. By studying the regularity of the system's multi-stable state, we first ensured that the laser system operated in a steady state. Then output avoids uneven distribution of pulse energy or missing pulses due to period bifurcation state or chaos state. By adding multiple gain sub-rings within the cavity, the sub-ring structure itself indirectly mitigates the ASE self-saturation while smoothing the pulse. The method will avoid the severe power loss caused by traditional smoothing methods by adjusting the AOM rising edge time. It will also avoid lowering the ASE lasing threshold at high repetition frequency. Meanwhile, the intra-cavity backward ASE can be effectively absorbed by inserting the gain fiber in the sub-rings to directly mitigate the ASE self-saturation. The system's continuously adjustable repetition frequency can be as high as over 300 kHz. It ensures that output power above the watt level and a < 0.2 nm narrow bandwidth can be maintained while tuning the repetition frequency. The narrowest smoothing pulse width of 28 ns has been reached.

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Experimental investigation of high-power broadband all-fiber nanosecond superfluorescent source

Cited by 2 publications

References 43 publications

Over 10‐W, 2.0‐μm, Broadband, All‐Fiber Amplified Spontaneous Emission Source Based on Spectrum Combination

Over 10‐W, 2.0‐μm, Broadband, All‐Fiber Amplified Spontaneous Emission Source Based on Spectrum Combination

High repetition frequency tunability active Q-switched all-fiber laser by multi-gain sub-rings smoothing multipeak pulse and suppressing ASE self-saturation

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