Fiber End Caps


  • End Caps with Diameters up to 8 mm
  • Available Uncoated or with 1064 nm VAR Coating
  • ≥Ø5 mm Caps Have Taper or Stem for Splicing
  • Ideal for High-Power Coupling or to Protect Photonic Crystal Fiber

FEC1

Ø1 mm End Cap

FEC15

Ø1.5 mm End Cap

FEC5-1064

Ø5 mm End Cap with Taper,
1064 nm VAR Coating

FEC8S-1064

Ø8 mm End Cap with Taper and Stem,
1064 nm VAR Coating

Application Idea

FEC8S-1064 End Cap Spliced onto a Ø400 µm Core Fiber
(Not Shown to Scale)

Related Items


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Image of an FEC5-1064 Ø5 mm end cap with tapered lead-in prepared for splicing in the GLZ4001EC CO2 End Cap Splicer.

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Coupling Light into and Out of Standard Fiber vs. End-Capped Fiber

Features

  • Ø1 mm to Ø8 mm UV Fused Silica Coreless End Caps
  • Tapered Lead-in Simplifies Splicing Fiber onto ≥Ø5 mm Caps
  • Versions with 1064 nm VAR-Coated Face to Reduce Back Reflections at the Air-to-Glass Interface
  • >80% Clear Aperture for Each End Face
  • ≤5 arcsec Parallelism Between End Faces
  • Protect Fiber End Face by Reducing Energy Density at Air-to-Glass Interface
  • Ideal for High-Power Fiber Lasers and Amplifiers, Biomedical Imaging, and Protecting Photonic Crystal Fiber
  • Splice onto Optical Fiber Using Our Vytran® CO2 End Cap Splicer

Thorlabs' UV fused silica end caps range in size from Ø1 mm to Ø8 mm. End caps with a 5 mm or 8 mm cap diameter have either a stem or tapered lead-in on one end to simplify splicing them onto a fiber. They are also available with a 1064 nm antireflection coating on the side opposite the taper to reduce back reflections. Complete specifications along with profiles and dimensions are in the table below.

Each end cap is coreless (no waveguide) to allow the incoming light to expand evenly in the homogeneous material. When spliced onto a fiber, the end cap reduces the intensity at the air-to-glass interface of the fiber face to prevent potential damage from high-power sources, such as Q-switched lasers or fiber amplifiers. End caps can also be used to seal off the air holes in photonic crystal fiber to prevent water from entering.

Application Note
These caps can be spliced onto optical fiber using our Vytran® CO2 End Cap Splicer. The GLZ4001EC Splicer is an advanced splicer that is designed for splicing numerous types of fiber directly onto a large-diameter end cap. Utilizing a tapered lead-in allows end caps up to Ø9.5 mm to be spliced, as shown in the image to the bottom right. Without a lead-in the maximum end cap diameter is 5 mm.


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Fiber End Caps, Uncoated

Item # Dimensions (See Profile) Profile
(Click for Details)
Clear
Apertureb
Surface
Quality
Surface
Flatnessa
Parallelism Substrate
DCap LCap LStem DS/Ta θTaper
FEC1 1.0 mm 2.5 mm N/A N/A N/A >80% 20-10
Scratch-Dig
≤λ/4 at
633 nm
≤5 arcsec UV Fused Silica
FEC15 1.5 mm 3.8 mm
FEC2 2.0 mm 5.0 mm
FEC5 5.0 mm 12.5 mm N/A 1.8 mm 60°
FEC8 8.0 mm 20.0 mm
FEC8S 8.0 mm 20.0 mm 4.0 mm 1.8 mm 60°
  • Diameter of the stem or the smallest part of the taper.
  • For both ends of the cap.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FEC1 Support Documentation
FEC1Fiber End Cap, Ø1.0 mm, Uncoated
$90.85
Today
FEC15 Support Documentation
FEC15Fiber End Cap, Ø1.5 mm, Uncoated
$90.85
Today
FEC2 Support Documentation
FEC2Fiber End Cap, Ø2.0 mm, Uncoated
$90.00
Lead Time
FEC5 Support Documentation
FEC5Fiber End Cap, Ø5.0 mm, Tapered End, Uncoated
$75.00
Today
FEC8 Support Documentation
FEC8Fiber End Cap, Ø8.0 mm, Tapered End, Uncoated
$75.00
Today
FEC8S Support Documentation
FEC8SFiber End Cap, Ø8.0 mm, Tapered End with Stem, Uncoated
$79.00
Today

Fiber End Caps, VAR Coated for 1064 nm

Item # Dimensions (See Profile) Profile
(Click for Details)
Clear
Apertureb
Surface
Quality
Surface
Flatnessc
Parallelism Substrate AR V Coatingc
DCap LCap LStem DS/Ta θTaper
FEC5-1064 5.0 mm 12.5 mm N/A 1.8 mm 60° >80% 20-10
Scratch-Dig
≤λ/4 at
633 nm
≤5 arcsec UV Fused Silica R < 0.25%
at 1064 nm
(0° ± 5° AOI)
FEC8S-1064 8.0 mm 20.0 mm 4.0 mm 1.8 mm 60°
  • Diameter of the stem or the smallest part of the taper.
  • For both ends of the cap.
  • The antireflection coating is deposited on the side opposite the taper.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FEC5-1064 Support Documentation
FEC5-1064Fiber End Cap, Ø5.0 mm, Tapered End, 1064 nm VAR Coating
$80.73
Today
FEC8S-1064 Support Documentation
FEC8S-1064Fiber End Cap, Ø8.0 mm, Tapered End with Stem, 1064 nm VAR Coating
$84.85
Today