Femtosecond fiber laser at 780 nm for two-photon autofluorescence imaging
We present a Er:fiber based femtosecond laser at 780 nm with 256-MHz repetition rate, 191-fs pulse duration, and over 1-W average power. Apart from the careful third-order dispersion management, we introduce moderate self-phase modulation to broaden the output spectrum of the Er:fiber amplifier and achieve 193-fs pulse duration and 2.43-W average power. Over 40% frequency doubling efficiency was obtained by a periodically poled lithium niobate crystal. Delivering through a hollow-core photonics bandgap fiber, this robust laser becomes an ideal and convenient light source for two-photon autofluorescence imaging.
Wang Aimin,Yang Wan,Wu Danlei,Wu Runlong,Liu Guanyu,Chen Bingying,Feng Lishuang,Zhang Zhigang. Femtosecond fiber laser at 780 nm for two-photon autofluorescence imaging[J].Chinese Optics Letters,2019,17(7):07.