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Spectroscopic detection of water, isotopic CO2, and methane is performed inside the cavity of a degenerate OPO pumped by an ultrafast Er- or Tm-fiber laser, in the corresponding spectral ranges of 2.7–3.7 and 3.1–5.8 μm.
We demonstrate wavelength tunable coherent Raman soliton generation in a Tm fiber amplifier seeded with a passively mode locked Tm fiber oscillator and subsequent octave spanning continuum generation in highly-nonlinear fibers.
We observed a 200-nm spectrum broadening of the third harmonics (520 nm) of an Er-doped mode-locked fiber laser (1560 nm) based on cross-phase modulation in a photonic crystal fiber.
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