Abstract
A compact, stable, low-cost femtosecond fiber-based laser source operating in the 980 nm would benefit two-photon fluorescence microscopy. In recent year, there has been extensive research on the development of femtosecond fiber lasers operating in the 1020-1100nm facilitated by the high gain and large bandwidth of ytterbium doped fiber amplifiers. However the realization of such sources in the three-level operation regime of ytterbium ions at 980 nm is more challenging. Firstly, to shift the gain to 980nm, population inversion exceeding 50% is required, implying the use of a short Yb-doped fiber with small core to cladding ratio [1, 2]. Therefore after direct amplification of picoseconds pulses, this fiber amplifier would not induce sufficient spectral broadening to support femtosecond pulses. Secondly, the narrow gain bandwidth centered at 977nm seriously limits the potential for short pulse amplification. So far, demonstrations of ultrafast fiber based sources at 980nm have been limited to 3.5 ps pulses at 10MHz, with an average power of 35mW [3].
© 2009 IEEE
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