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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 investigated linear-cavity with ultra-low repetition rate Erbium-doped fiber laser mode-locked by a high modulation depth SESAM. Output pulses were highly-chirped, at energy up to 14 nJ and minimum repetition rate was 25 kHz.
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.
A new InGaAs/InAlAs multi-layer design of broadband SESAM including precise phase shift compensation is proposed. Simulation demonstrates a uniform modulation depth up to 25% for the wavelength from 1000 to 1080 nm.
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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