High-power fiber cladding power stripper

Patent metadata

Field	Value
Publication number	US-10622778-B2
Application number	US-201715479652-A
Country	US
Kind code	B2
Filing date	Apr 5, 2017
Priority date	Apr 5, 2017
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A high-power fiber cladding power stripper comprises a core unit, a cladding layer, a grating structure, and a jacket. The core unit is an optical conductive material. The cladding layer is disposed outside the core unit, wherein a refractive index of the cladding layer is lower than that of the core unit. The grating structure, disposed outside the cladding layer, is for producing diffraction effects. The jacket surrounds and protects the core unit, the cladding layer, and the grating structure. Hence, in a high-power fiber laser system, the cladding power stripper can be utilized for removing residual pump energy before the laser light entering an output collimator.

First claim

What is claimed is:

1. A high-power fiber cladding power stripper, comprising:
a core unit, which comprises an optical conductive material;
a cladding layer, disposed outside the core unit, a refractive index of the cladding layer is lower than that of the core unit;
a grating structure, disposed outside the cladding layer, for producing diffraction effects;
a jacket, surrounding and protecting the core unit, the cladding layer, and the grating structure,
wherein the grating structure is manufactured by using one of a dual beam interference technique and a direct laser writing technique,
wherein the grating structure is in a sinusoidal form, at least in part.

2. The cladding power stripper according to claim 1 , wherein the grating structure is a non-periodic grating structure.

3. The cladding power stripper according to claim 1 , wherein the grating structure is a periodic grating structure or a periodically gradual grating structure.

4. The cladding power stripper according to claim 3 , wherein the periodic grating structure or the periodically gradual grating structure has a period in a range of 0.5 μm to 3 μm.

5. The cladding power stripper according to claim 1 , wherein the grating structure has a duty cycle in a range of 5% to 95%.

6. The cladding power stripper according to claim 1 , wherein the grating structure has a height in a range of 0.5 μm to 200 μm.

7. The cladding power stripper according to claim 1 , wherein the grating structure has a refractive index in a range of 1.3 to 1.7.

8. The cladding power stripper according to claim 1 , wherein the grating structure is in a square form, at least in part.

9. The cladding power stripper according to claim 1 , wherein the grating structure is a random form.

10. The cladding power stripper according to claim 1 , wherein the grating structure comprises a plurality of grating sections arranged adjacent to each other along the cladding layer.

11. The cladding power stripper according to claim 1 , wherein the grating structure comprises a plurality of grating sections spaced apart along the cladding layer.

Assignees

• Nat Chung Shan Inst Science & Tech
• Nat Chung Shan Institute Of Science And Technolgy

Inventors

• Lin Jian-Hung
• Tai Po-Tse
• Yen Wei-Chung

Classifications

• H01S3/094007

  Cladding pumping, i.e. pump light propagating in a clad surrounding the active core · CPC title

• G02B6/4417

  High voltage aspects, e.g. in cladding · CPC title

• H01S3/0675 Primary

  Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers · CPC title

• H01S3/06729

  Peculiar transverse fibre profile · CPC title

• G02B6/02095

  Long period gratings, i.e. transmission gratings coupling light between core and cladding modes · CPC title