Hollow-core fibers (HCF) are revolutionizing laser transmission applications, offering unmatched performance for a variety of laser types. HCFs are particularly beneficial for high-power ultra-short pulse lasers, where their unique design helps mitigate nonlinear effects and prevent damage that typically occurs in solid-core fibers. They also excel in transmitting narrow linewidth lasers with minimal spectral broadening, ensuring precision and stability. Moreover, HCFs are adept at handling a broad range of wavelengths, from UV to visible to mid-infrared, providing versatility across numerous applications. To achieve polarization-maintaining (PM), specially designed PM-HCFs maintain the integrity of the polarization state over long distances, which is crucial for applications requiring high polarization purity. This combination of capabilities makes HCF an ideal choice for advanced laser transmission needs.