Random distributed Rayleigh feedback fiber laser based on double-cladding weakly ytterbium-doped fiber

Patent metadata

Field	Value
Publication number	US-10644475-B2
Application number	US-201816112516-A
Country	US
Kind code	B2
Filing date	Aug 24, 2018
Priority date	Jul 9, 2018
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

A random distributed Rayleigh feedback fiber laser based on a double-cladding weakly ytterbium-doped fiber includes: a pump laser source, a pump combiner, a cladding power stripper, and a double-cladding weakly ytterbium-doped fiber for simultaneously achieving distributed active gain and random distributed Rayleigh feedback. An output end of the pump combiner is connected with one end of the double-cladding weakly ytterbium-doped fiber, the other end of the double-cladding weakly ytterbium-doped fiber is connected with an input end of the cladding power stripper, and a concentration of ytterbium ions in the double-cladding weakly ytterbium-doped fiber is in a range of 0.5×10 23 to 1×10 25 /m 3 . The laser provided by the present invention solves the problem that the existing random fiber lasers cannot simultaneously utilize distributed active gain and random distributed Rayleigh feedback with a single type of fiber.

First claim

What is claimed is:

1. A random distributed Rayleigh feedback fiber laser based on a double-cladding ytterbium-doped fiber, which comprises: a pump laser source ( 1 ), a pump combiner ( 2 ), a cladding power stripper ( 4 ), and a double-cladding ytterbium-doped fiber ( 3 ) for simultaneously achieving distributed active gain and random distributed Rayleigh feedback, wherein:
the pump laser source ( 1 ) is connected with an input end of the pump combiner an output end of the pump combiner ( 2 ) is connected with one end of the double-cladding ytterbium-doped fiber ( 3 ), the other end of the double-cladding ytterbium-doped fiber ( 3 ) is connected with an input end of the cladding power stripper ( 4 ), the double-cladding ytterbium-doped fiber ( 3 ) comprises an outer cladding layer, an inner cladding layer, and a fiber core from outside to inside in sequence; and a concentration of ytterbium ions in the double-cladding ytterbium-doped fiber ( 3 ) is in a range of 0.5×10 23 to 1×10 25 /m 3 ;
the random distributed Rayleigh feedback fiber laser further comprises an FBG-A ( 6 ) and an FBG-B ( 7 ), wherein the FBG-A ( 6 ) and random Rayleigh scattering in the double-cladding ytterbium-doped fiber ( 3 ) form a first-order semi-open cavity structure, the FBG-B ( 7 ) and the random Rayleigh scattering in the double-cladding ytterbium-doped fiber ( 3 ) form a second-order semi-open cavity structure, so as to enhance first-order second-order feedback; a signal end of the pump combiner ( 2 ) is connected with one end of the FBG-A ( 6 ), the other end of the FBG-A ( 6 ) is connected with the FBG-B ( 7 ).

2. The random distributed Rayleigh feedback fiber laser based on the double-cladding ytterbium-doped fiber, as recited in claim 1 , wherein: a length of the double-cladding ytterbium-doped fiber ( 3 ) is in a range of 100 to 3000 m, a wavelength of the FBG-A ( 6 ) is in a range of 1015 to 1150 nm, and a wavelength of the FBG-B ( 7 ) is in a range of 1065-1300 nm.

3. A random distributed Rayleigh feedback fiber laser based on a double-cladding ytterbium-doped fiber, which comprises: a pump laser source ( 1 ), a pump combiner ( 2 ), a cladding power stripper ( 4 ), a double-cladding ytterbium-doped fiber ( 3 ), and an FBG (Fiber Bragg Grating) ( 5 ), wherein: an output end of the cladding power stripper ( 4 ) acts as a frontward output end of the laser, and a signal end of the pump combiner ( 2 ) acts as a backward output end of the laser; the pump laser source ( 1 ) is connected with an input end of the pump combiner ( 2 ), an output end of the pump combiner ( 2 ) is connected with one end of the double-cladding ytterbium-doped fiber ( 3 ), the other end of the double-cladding ytterbium-doped fiber ( 3 ) is connected with an input end of the cladding power stripper ( 4 ), and the signal end of the pump combiner ( 2 ) is connected with the FBG the double-cladding ytterbium-doped fiber ( 3 ) comprises a fiber core and a cladding layer from inside to outside in sequence, a diameter of the fiber core is in a range of 15-30 μm, a diameter of the cladding layer is in a range of 125-600 pan; a length of the double-cladding ytterbium-doped fiber ( 3 ) is in a range of 200 to 1000 m; a wavelength of the FBG ( 5 ) is in a range of 1015 to 1150 nm; and a concentration of ytterbium ions in the double-cladding ytterbium-doped fiber is in a range of 8×10 25 -1×10 27 /m 3 .

Assignees

• Univ Electronic Sci & Tech China

Inventors

• Wang Zinan
• Li Jiaqi
• Wu Han
• Rao Yunjiang

Classifications

• H01S3/0675 Primary

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

• H01S2301/03

  Suppression of nonlinear conversion, e.g. specific design to suppress for example stimulated brillouin scattering [SBS], mainly in optical fibres in combination with multimode pumping · CPC title

• H01S3/06708

  Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering (optical fibres as passive waveguides G02B6/02) · CPC title

• H01S3/1618

  ytterbium · CPC title

• H01S3/06779

  with optical power limiting · CPC title