Abstract

Controlling an ultrafast laser oscillator repetition rate is crucial for the emerging laser burst micromachining. The efficiency of a material surface treatment process as well as the quality of live tissue ablation depends, to a considerable extent, on the number of laser pulses in a burst window. In the following article, we present an all-PM fiber harmonically mode-locked Mamyshev ring oscillator capable of producing laser pulses with a tunable period. The oscillator can be operated at any frequency, being a multiple of the fundamental repetition rate up to 305 MHz at 19th harmonic. We found that the operation frequency is limited by the available pump power only. What is worth noting is that the energy of the emitted pulses is independent of the operating frequency. The essential laser parameters are excellent: an amplitude noise of 0.1% and fundamental frequency suppression levels of 70 dB at every repetition rate. Additionally, the mechanism of harmonic mode-locking is discussed in detail and is found to be caused by gain depletion and recovery effect.

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