Protect Fiber End Face by Reducing Energy Density at Air-to-Glass Interface.≤5 arcsec Parallelism Between End Faces.Versions with 1064 nm VAR-Coated Face to Reduce Back Reflections at the Air-to-Glass Interface.Tapered Lead-in Simplifies Splicing Fiber onto ≥Ø5 mm Caps.Ø1 mm to Ø8 mm UV Fused Silica Coreless End Caps.