HomeProductsFiberFiberPhotonic Crystal Fiber (PCF) Endlessly Single Mode, Large Mode Area PCF
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Endlessly Single Mode, Large Mode Area PCF

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Endlessly Single Mode, Large-Mode-Area-Fiber




  • Single Mode at Wavelengths
  • Pure Silica Core and Cladding
  • Available with Core Sizes from Ø5 μm to Ø35 μm

Features

  • Endlessly Single Mode Operation - No Higher Order Mode Cut-Off
  • Polarization-Maintaining Versions Available
  • Handles Very High Average Power
    as well as High Peak Power
  • Low Nonlinearities
  • Low Fiber Loss
  • Mode Field Diameter is Wavelength Independent
  • Available with Core Sizes from 5 to 35 μm

Applications

  • Delivery of High-Power Broadband Radiation in a Single Spatial Mode
  • Short Pulse Delivery
  • Mode Filtering
  • Laser Pigtailing
  • Multiwavelength Guidance
  • Sensors and Interferometers

Thorlabs offers a selection of Endlessly Single Mode (ESM), Large-Mode-Area (LMA) Photonic Crystal Fibers (PCFs), including Polarization-Maintaining (PM) versions. A conventional single mode fiber is actually multimode for wavelengths shorter than the second-mode cutoff wavelength, limiting the useful operating wavelength range in many applications. In contrast, Crystal Fibre's endlessly single mode PCFs are truly single mode at all wavelengths for which fused silica is transparent.

In practice, the useful operating wavelength range is limited only by bend loss. Although the cladding possesses six-fold symmetry, the mode profile is very similar to the quasi-Gaussian fundamental mode of a conventional, axially symmetric, step-index fiber, resulting in a form overlap that is >90%. Unlike conventional fibers, these fibers are fabricated from a single material - undoped, high-purity, fused silica glass. The combination of material and very large mode area enables high power levels to be transmitted through the fiber without material damage or the adverse effects caused by the fiber's nonlinear properties.

 

 

Endlessly Single Mode, Large-Mode-Area, Single Mode, Photonic Crystal Fiber

Item #ESM-12BLMA-20LMA-25LMA-35
Optical Properties
Mode Field Diametera 10.3 ± 1 µm @ 1064 nm
10.5 ± 1 µm @ 1550 nm
16.4 ± 1.5 µm @ 780 nm
16.5 ± 1.5 µm @ 1064 nm
20.6 ± 2.0 µm @ 780 nm
20.9 ± 2.0 µm @ 1064 nm
26.0 ± 2.5 μm
Single Mode Cutoff Wavelength Noneb
Attenuationc <0.01 dB/m @ 1550 nm
Numerical Aperture (5%) 0.11 ± 0.02 @ 1064 nm 0.06 ± 0.02 @ 1064 nm 0.048 ± 0.02 @ 1064 nm 0.046 ± 0.01 @ 1550 nm
Mode Field Area - ~215 µm 2 ~265 µm 2 ~530 µm 2
Physical Properties
Signal Core Diameterd 12.0 ± 0.5 µm 19.9 ± 0.5 μm 25.1 ± 0.5 μm 35.0 ± 0.5 μm
Outer Cladding Diameter, OD 125 ± 5 µm 230 ± 5 μm 258 ± 5 μm 335 ± 5 μm
Coating Diameter 245 ± 10 µm 350 ± 10 μm 342 ± 10 μm 488 ± 10 μm
Cladding Material Pure Silica
Coating Material Acrylate, Single Layer
Proof Test Level 0.5% 0.33% 0.33% -
  • Full width at points in the near field where intensity has dropped to 1/e2 of the peak value.
  • TIA-455-80-C Standard
  • Measured for a bend radius of 16 cm
  • This specification is the geometrical (or physical) core diameter of the fiber.

Endlessly Single Mode, Large-Mode-Area, Polarization-Maintaining, Photonic Crystal Fiber

Item #LMA-PM-5LMA-PM-10LMA-PM-15
Optical Properties
Mode Field Diametera 4.2 ± 0.5 μm 8.0 ± 0.8 μm 12.5 ± 0.5μm
Attenuationb  
Numerical Aperture 0.09 ± 0.01 @ 470 nm 0.10 ± 0.05 @ 1060 nm 0.09 ± 0.02 @ 1060 nm
Cut-off Wavelength None
Physical Properties
Signal Core Diameterc 5.0 ± 0.5 μm 10.0 ± 1 μm 15.0 ± 0.5 μm
Outer Cladding Diameter, OD 125 ± 3 μm 230 ± 5 μm 230 +1/-5 μm
Coating Diameter 245 ± 10 μm 350 ± 10 μm 350 ± 10 μm
Cladding Material Pure Silica
Coating Material Acrylate, Single Layer
Proof Test Level 0.5% 10 N
  • Full width at points in the near field where intensity has dropped to 1/e2 of the peak value.
  • Measured for a bend radius of 16 cm
  • This specification is the geometrical (or physical) core diameter of the fiber.

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