Technology and applications of ultrafast fiber lasers
2012
We briefly review the key technology of modern fiber based femtosecond laser sources summarizing advantages and
disadvantages of different mode-locking solutions. A description of possible extensions of a FemtoFiber-type modelocked
Er-doped fiber laser oscillator (1560 nm) reveals the flexibility with respect to wavelength coverage (488 nm ..
2200 nm) and pulse duration (10 fs .. 10 ps). The resulting FemtoFiber family and its versions for instrument integration
allow one to use these state-of-the-art light sources in many important applications, e.g. THz spectroscopy and
microscopy. We show that, depending on the fiber laser model and the THz emitter, THz radiation can be produced with
4-10 THz bandwidth and detected with up to 60 dB signal-to-noise ratio (SNR). Electronically controlled optical
scanning (ECOPS) - a unique method for fast, precise and comfortable sampling of the THz pulse or other pump-probe
experiments - is described and recommended for efficient data acquisition. As examples for modern microscopy with
ultrafast fiber lasers we present results of two-photon fluorescence, coherent microscopy techniques (SHG/THG/CARS)
and fluorescence lifetime imaging (FLIM).
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