We demonstrated efficient frequency doubling of the ultrafast laser system at the wavelength range of 1620 – 1700 nm. The laser system was based on Er3+ fiber laser with Raman soliton self-frequency shift (SSFS) stage. The power of SSFS radiation was up to 110 mW/10.9 MHz with a pulse duration of 125 fs. PPLN crystal with several quasi-phase matching periods was used for efficient frequency doubling in the tuning range. The highest SHG power of 55 mW was obtained at 1675 nm with conversion efficiency of > 50%. The developed laser will be used for bladder cancer diagnosis by multi-photon bioimaging.
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