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Published on: February 28, 2016
Influence of Pump Current Waveform on The Mitigation of Transverse Mode Instability in Fiber Laser Oscillator
Junyu Chai1,2,3, Wenguang Liu1,2,3, Xiaolin Wang1,2,3
1College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China.
Abstract:
We carry out a detailed investigation of TMI mitigation by pump modulation based on multiple current waveforms in a fiber laser oscillator. Compared with continuous wave (CW), the modulation of various waveforms, including sinusoidal wave, triangular wave, and pulse wave with a duty cycle of 50% and 60%, can increase the TMI threshold. The average output power of a stabilized beam is boosted via the adjustment of phase difference between the signal channels. The TMI threshold is increased to 270 W under a modulation of pulse wave (duty cycle: 60%) with a phase difference of 440 μs, where the beam quality is 1.45. This threshold can be further improved by adding groups of pump LDs and drivers, which is a promising approach for beam stabilization of high-power fiber lasers.
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