Anti-resonance preform with two contact points

An anti-resonance element preform for producing an anti-resonant hollow-core fiber, comprising

• a first longitudinal axis,
• an ARE outer element designed in a circular arc-like manner, and an ARE inner element,
• wherein the ARE outer element and the ARE inner element are connected to one another along two connecting lines, which are arranged essentially in parallel to the first longitudinal axis,
• wherein
• the ARE outer element has an inner space, which is at least partially limited by an ARE outer wall and into which the ARE inner element, designed in a circular arc-like manner, protrudes at least partially,
• wherein
• the ARE outer element has a first circle radius R_outer and
• the ARE inner element has a second circle radius R_inner,
• the ARE outer element has a first center angle α_outer and
• the ARE inner element has a second center angle α_inner,
• wherein the first circle radius R_outer and the second circle radius R_inner are essentially of identical length,
• and the anti-resonance element preform has the following features:
• R_outer and R_inner smaller than 12 mm, and
• R_outer and R_inner larger than 0.5 mm,
• wherein
• α_outer smaller than 350° and α_inner larger than 30°.