Hollow core optical fiber and a laser system
AssigneeNkt Photonics A/S
InventorsJens Kristian LYNGSØE, Christian JAKOBSEN, Mattia MICHIELETTO
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Abstract
A hollow core photonic crystal fiber (PCF) including an outer cladding region and seven hollow tubes surrounded by the outer cladding region. Each of the hollow tubes is fused to the outer cladding to form a ring defining an inner cladding region and a hollow core region surrounded by the inner cladding region. The hollow tubes are not touching each other, but are arranged with distance to adjacent hollow tubes. The hollow tubes each have an average outer diameter d2 and an average inner diameter d1, wherein d1/d2 is equal to or larger than about 0.8, such as equal to or larger than about 0.85, such as equal to or larger than about 0.9. Also, a laser system.
Claims21
1-21. (canceled)
A hollow core photonic crystal fiber (PCF) comprising an outer cladding region and a plurality of hollow tubes surrounded by said outer cladding region, each of said hollow tubes having an average inner tube diameter d1 and an average outer tube diameter d2,
- where each of said hollow tubes is fused to said outer cladding region to form a ring defining an inner cladding region and a hollow core region surrounded by said inner cladding region,
- wherein at least one of said hollow tubes comprises a nested sub-tube having an average outer sub-tube diameter dsub smaller than the average inner diameter d1 of said hollow tube and arranged in the hollow structure of the hollow tube and fused to the hollow tube, and
- where at least one of said hollow tubes is free of a nested sub-tube arranged in the hollow structure of said hollow tube.
A hollow core photonic crystal fiber (PCF) comprising an outer cladding region and a plurality of hollow tubes surrounded by said outer cladding region, each of said hollow tubes having an average inner tube diameter d1 and an average outer tube diameter d2,
- where each of said hollow tubes is fused to said outer cladding region to form a ring defining an inner cladding region and a hollow core region surrounded by said inner cladding region,
- wherein the hollow tubes of a first group of said plurality of hollow tubes comprises a nested sub-tube having an average outer sub-tube diameter dsub smaller than the average inner diameter d1 of said hollow tube and arranged in the hollow structure of the hollow tube and fused to the hollow tube, and
- where the hollow tubes of a second group of said plurality of hollow tubes is free of a nested sub-tube.
Dependencies are inferred from the claim text.