A 1 μm laser output based on an Er-doped fiber femtosecond laser

The spectral intensity near 1 µm in a supercontinuum (SC) generated from an Er-doped fiber femtosecond optical frequency comb is enhanced effectively by cascading an Yb-doped fiber amplifier after spectral broadening. A 1 µm laser output with a dechirped pulse width of 72 fs and a spectral width of 25 nm is achieved. Through further power amplification, the output power of 1 µm laser can be up to 750 mW and the pulse width after compression is 85 fs. The spectral enhancement technology provides an effective optical source for a 1 µm optical frequency comb based on an Er-doped fiber femtosecond laser.