Hollow core HC-4400 pages

Crystal Fibre

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aeroLASE

Koheras

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●

HC-440-02

SuperK

Spectral
Filtering

Hollow
Core

Hollow Core Photonic Bandgap Fiber
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•
•
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>95% of optical power located in air
Gaussian-like fundamental mode
Can be filled with gas
Low bend loss down to few mm bend radius
Fresnel reflection to air at the end faces <10-4
Undoped silica for good temperature stability

Hollow core photonic bandgap fibers guide light in a hollow
core surrounded by a microstructured cladding formed by a
periodic arrangement of air holes in silica.
Since only a small fraction of light propagates in glass, the effect of material nonlinearities is significantly reduced.

Schematic

Applications include power delivery, pulse shaping and compression, sensors and non-linear optics.

Physical properties

Typical attenuation
3.7 μm ± 0.5 μm

Diameter of microstructured region
Cladding diameter

~18 μm
74 μm ± 5 μm

Coating diameter (single layer acrylate)
Coating material

225 μm ± 20 μm
Acrylate

Attenuation (dB/km
)

Core diameter

4000
3500
3000
2500
2000
1500
1000
500
0
400

425

450
475
Wavelength (nm)

500

Mode Profile

Optical properties
Center wavelength

440 ± 5 nm
~1.5 dB/m

Mode field diameter (1/e )
2

NA @ 440 nm1
Effective mode index

4 ± 1 μm
~0.2
~0.99

1. Sine of half angle at which a Gaussian fit to the far field intensity
distribution drops to 1% of its peak value.

1
Norm. intensity

Attenuation @ 440 nm

2

1

0.5

0
-5 -4 -3 -2 -1

0

1

2

3

4

5

Position (μm)

HC-440-02-101029

NKT Photonics A/S (Headquarters)
Blokken 84 ● 3460 Birkerød ● Denmark
Phone: +45 4348 3900
Fax:
+45 4348 3901
www.nktphotonics.com

NKT Photonics GmbH
Schanzenstrasse 39 ● Bldg D9-D13
51063 Cologne ● Germany
Phone: +49 221 99511-0
Fax:
+49 221 99511-650

NKT Photonics Inc.
1400 Campus Drive West ● Morganville
NJ 07751 ● USA
Phone: +1 732 972 9937
Fax:
+1 732 414 4094