Pulse-to-pulse wavelength switching of a nanosecond fiber laser by four-wave mixing seeded stimulated Raman amplification

作者：Eibl Matthias; Karpf Sebastian; Hakert Hubertus; Bloemker Torben; Kolb Jan Philip; Jirauschek Christian; Huber Robert^*

来源：Optics Letters, 2017, 42(21): 4406-4409.

DOI：10.1364/OL.42.004406

We report on a multi-color fiber laser based on four-wave mixing (FWM) and stimulated Raman scattering (SRS), delivering rapidly wavelength switchable narrowband output at 1064, 1122, and 1186 nm. High-power pulses from a nanosecond pulsed fiber master oscillator power amplifier at 1064 nm are combined with 1122 nm of seed light for Raman amplification at the first Stokes order in a standard single-mode fiber. With increasing power, we observe a narrowband spectral component at 1186 nm, without any additional seed or resonator at this wavelength. We analyze this occurrence of a narrowband second Stokes order both experimentally and theoretically and suggest it is a result of FWM seeding of the SRS amplification in the fiber. We demonstrate that the wavelength shifting can be controlled electronically within microseconds for very rapid and even pulse-to-pulse wavelength changes. This wavelength conversion method can extend the spectral coverage of single-wavelength fiber lasers for biomedical imaging.

• 出版日期2017-11-1