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The paper summarizes recent advances in Er and Yb doped mode locked fiber lasers with saturable absorbers such as semiconductor and carbon nanotube saturable absorbers.
We demonstrate the long linear-cavity with ultra-low repetition rate Ytterbium-doped fiber laser mode-locked by a SESAM. Output pulses were highly-chirped, with energies high to 75.2 nJ and minimum repetition rate was 191 kHz.
381 kHz repetition-rate operation of an Yb-doped fiber laser oscillator and amplifier was demonstrated. The single pulse energy was 734 nJ after the single stage amplification.
A long ring-cavity, low repetition rate Yb-doped fiber laser was demonstrated. Pulses with repetition rate of about 381.3 kHz and single pulse energy above 300 nJ were obtained.
A novel ring cavity incorporated with both semiconductor saturable absorber mirror and grating pair is proposed and demonstrated in a Yb-doped fiber laser. The laser proves self-starting and delivers 84-fs pulses at 1038 nm with a spectral bandwidth of 22 nm. The pulse energy is 0.55 nJ.
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