Mr. Zhejian Hong Profile

Zhejian Hong

at National Univ of Defense Technology

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Proceedings Article | 18 June 2021 Paper

Theoretical and experimental research on quasi-CW fiber laser based on overshoot pump modulation

Zhejian Hong, Yingchao Wan, Xiaoming Xi, Hanwei Zhang, Xiaolin Wang, Xiaojun Xu

Proceedings Volume 11850, 118501D (2021) https://doi.org/10.1117/12.2599776

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For diode pump fiber laser, there’s potential to achieve high power quasi-CW output by applying overshoot pulse modulation to diode, meaning that applying several times of currents to the diode to attain remarkably higher power than rated value. In this paper, we first build up the physical modal of the quasi-CW fiber laser based on time-dependent rate equations and solve them with parallelizable bidirectional method for simulation. The result shows that for square wave pump with 1kHz frequency and 500μs duration, the output peak power is about 5.1kW with 2kW forward pump and 4kW backward pump. Applying overshoot pulse modulation to 3 diodes at 976nm to pump ytterbium-doped fiber oscillator, we obtain 500Hz, 1kHz frequency and 100, 200μs duration output, respectively. With 1kHz frequency and 200μs duration pump with an average power of 192W, the average output power is 192W with 60.8% optical efficiency at 1080nm, of which the M² beam quality is about 1.5. The output waveform shows good consistency of the pump diode with low delay between. It’s the very first time in the country to attain pulse fiber laser output by applying overshoot pulse modulation to diode to our acknowledgment.

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