Abstract
We demonstrate highly stable mode-locked Yb-doped fiber oscillators using a nonlinear amplifying loop mirror, delivering linearly polarized laser pulses with high energy at a low repetition rate of several MHz. These lasers are composed of polarization-maintaining fibers and fiber-based components without intra-cavity dispersion compensation. The spectral and temporal characteristics are systematically investigated at different repetition rates. Spectral bandwidth of 31 nm is realized in the case of 6 MHz repetition rate, and the pulse energy reaches 10 nJ. A pair of gratings compresses the output pulse to 93 fs. RMS power stability is as low as 0.04% in 10 hours, which shows excellent stability. We believe that this type of fiber oscillator is an ideal seed for further high power amplification.
Highlights
Fiber lasers have attracted plenty of attentions in recent years since the outstanding thermooptical properties, structural compactness, long-term stability, and excellent beam quality [1,2]
The pulse properties of mode-locked fiber oscillator are crucial to fiber amplifiers because they affect temporal and spectral features of the amplified pulses
We report highly-stable mode-locked all-PM Yb-doped fiber oscillators using NALM, delivering linearly polarized pulses at repetition rates of several MHz
Summary
Fiber lasers have attracted plenty of attentions in recent years since the outstanding thermooptical properties, structural compactness, long-term stability, and excellent beam quality [1,2]. X. Zhou et al obtained 28-fs dispersion managed (DM) mode-locked fiber laser based on NPE by inserting a pair of gratings in the oscillator cavity, but the pulse energy was less than 1 nJ [20]. PM NOLM and NALM fiber oscillators with short (100 fs) pulse duration, low (
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