Abstract
Studies on stimulated Raman scattering (SRS) in an ytterbium (Yb)-doped all-fiber amplifier setup seeded by a mode-locked all-normal dispersion Yb-doped fiber oscillator have been carried out. Oscillator pulses at 40 MHz repetition rate, centered at about 1060 nm having a spectral width of ~10 nm, were amplified in an all-fiber multi-stage amplifier setup in chirped pulse amplification configuration. We observed that the length of the fiber used as a stretcher plays a crucial role in SRS generation. Experimentally, 8.4 W power in the first SRS band at ~1120 nm was obtained from total amplifier output power of 10.8 W with a 30 m length of stretcher fiber, leading to as high as ~77% conversion efficiency. This is the highest average output power and conversion efficiency achieved without any external seed source at Stokes wavelength or with a synchronous pumping mechanism. Numerical simulations have also been carried out to show that there is an optimum stretcher fiber length for which maximum conversion of the amplifier power into the first SRS band takes place.
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