These fibers enable single mode transmission from 400 - 680 nm and feature an acrylate jacket. The S405-XP and SM400 fibers both consist of an undoped, pure silica core, and the SM400 fiber is surrounded by a depressed, fluorine-doped cladding. Details on the physical and optical properties of these fibers are provided in Tables G1. Patch cables that incorporate these fibers are available from stock, see. Here, we present a complete study of our single-mode fiber-tip STEs' optical damage thresholds covering the kilohertz, megahertz, and gigahertz repetition-rate regimes as well as continuous-wave irradiation. As a very important finding, we introduce the necessity of classifying the optical damage. This application note describes optical damage of fiber facets in pulsed systems and guidelines are given on the damage thresholds and how these depend on the pulse length. It provides an expert-curated supplier directory, buyer-focused technical background information, and structured selection criteria to support professional procurement decisions. What is. We found that the threshold power for fiber fuse propagation in photonic crystal fiber (PCF) and hole-assisted fiber (HAF) can exceed 18 W, which is more than 10 times that in conventional single-mode fiber (SMF).