PUB - Publikationen an der Universität Bielefeld

We demonstrate a compact watt -level all polarization -maintaining (PM) femtosecond fiber laser source at 1100 nm. The fiber laser source is seeded by an all PM fiber mode -locked laser employing a nonlinear amplifying loop mirror. The seed laser can generate stable pulses at a fundamental repetition rate of 40.71 MHz with a signal-to-noise rate of >100 dB and an integrated relative intensity noise of only -0.061%. After two -stage external amplification and pulse compression, an output power of -1.47 W (corresponding to a pulse energy of -36.1 nJ) and a pulse duration of -251 fs are obtained. The 1100 nm femtosecond fiber laser is then employed as the excitation light source for multicolor multi -photon fluorescence microscopy of Chinese hamster ovary (CHO) cells stably expressing red fluorescent proteins. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement