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Introduction In an era defined by rapid technological advancement, blockchain technology has emerged as a crucial innovation that is reshaping industries across the globe. Originally conceived to support the cryptocurrency Bitcoin, blockchain's potential has been recognized far beyond its initial application, promising transformative benefits in sectors such as banking, healthcare, supply chain, and beyond. This article delves into the significance of blockchain technology, exploring its fundamental principles and the profound impact it could have on the futu

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We experimentally investigate characteristics of saturable absorbers (SAs) based on nonlinear Kerr beam cleanup effect (NL-KBC). The SAs are formed by a long graded-index multimode fiber (GRIN MMF) with a short single-mode fiber served as a diaphragm. We studied the evolution of output spectrum and beam profiles from the GRIN MMF in order to investigate the mechanism of these SAs. We further performed saturable absorption measurements to evaluate their modulation depths and saturation intensities. We experimentally observed an