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We present a flexible all-polarization-maintaining (PM) mode-locked ytterbium(Yb):fiber laser based on a nonlinear amplifying loop mirror (NALM). Inaddition to providing detailed design considerations, we discuss the differentoperation regimes accessible by this versatile laser architecture andexperimentally analyze five representative mode-locking states. These fivestates were obtained in a 78-MHz configuration at different intracavity groupdelay dispersion (GDD) values ranging from anomalous (-0.035 ps$^2$) to normal(+0.015 ps$^2$). We put a particular focus on the characterization of theintensity noise as well as the free-running linewidth of thecarrier-envelope-offset (CEO) frequency as a function of the differentoperation regimes. We observe that operation points far from the spontaneousemission peak of Yb (~1030 nm) and close to zero intracavity dispersion can befound, where the influence of pump noise is strongly suppressed. For such anoperation point, we show that a CEO linewidth of less than 10-kHz at 1 sintegration can be obtained without any active stabilization.

Flexible all-PM NALM Yb:fiber laser design for frequency comb applications: operation regimes and their noise properties