Couple light into photonic crystal fiber

AI Thread Summary
The discussion revolves around the challenges of coupling light into a hollow core fiber with a 20µm core and a numerical aperture of 0.03, using a Ti:Sapphire laser with a spot size of 2-2.5mm and a 50mm focal length. The user reports achieving only 6µW of power and seeks suggestions for improvement. A participant asks for more details about the fiber, specifically its design and loss characteristics at the laser wavelength. The conversation highlights the importance of understanding the fiber's specifications to diagnose the low power coupling issue. Additional information, such as a cross-section image and loss data, is requested to provide better assistance.
jlyu
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I have one hollow core fiber, the core is around 20um, Numerical Aperture is
0.03. The spot size of Ti:Sapphire laser is around 2~2.5mm. So I used focal
length 50mm. But only very few power can be achieved (6uw). I wonder
the reason. Could someone please give me some suggestions?
 
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jlyu said:
I have one hollow core fiber, the core is around 20um, Numerical Aperture is
0.03. The spot size of Ti:Sapphire laser is around 2~2.5mm. So I used focal
length 50mm. But only very few power can be achieved (6uw). I wonder
the reason. Could someone please give me some suggestions?

Hi There,

Maybe I can help you. Can you give a bit more information about the fiber you have? A 20µm core for a 800nm range hollow-core fibers sounds very big. Do you know if this is a 7 or a 19 cell design?

/Kim Hansen, NKT Photonics
 
Actually, I do not think it belongs to 7 or 19 cell design. :frown: It is made by some other research group.
 
No worries. We would be happy to help even if the fiber is not made by us. Do you have a picture of the cross section of the fiber? Also, do you know what the loss in the fiber is at your laser wavelength?
 

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