FIBER LASER

• US 20090274175A1
• Filed: 07/01/2009
• Published: 11/05/2009
• Est. Priority Date: 02/09/2007
• Status: Active Grant

• Current Assignee: Fujikura Limited
• Original Assignee: Fujikura Limited
• Inventors: SAKAI, Tetsuya, NAKAI, Michihiro, KITABAYASHI, Tomoharu
• Granted Patent: US 8,548,013 B2
• Time in Patent Office: Days
• US Class Current: 372/3
• CPC Class Codes: H01S 3/0064 Anti-reflection devices, e.g. optical isolaters absorbing layers for marking or protecting purposes in laser working B23K26/50; magneto-optical non-reciprocal devices G02F1/093, G02F1/0955
• CPC Class Codes: H01S 3/06758 Tandem amplifiers
• CPC Class Codes: H01S 3/2333 Double-pass amplifiers
• CPC Class Codes: H01S 3/2375 Hybrid lasers H01S3/07 takes precedence
• CPC Class Codes: H01S 3/302 in an optical fibre

Abstract

This fiber laser is provided with: a signal light source that outputs a signal light; a rare earth-doped fiber that amplifies and outputs the signal light from the signal light source; a Raman amplifying fiber that is routed as a portion of an optical transmission path in order to output the output light from the rare earth-doped fiber to an outside thereof; and a wavelength selecting element that is provided in the optical transmission path from the Raman amplifying fiber to the signal light source and does not allow transmission of a Stokes light that is generated in the Raman amplifying fiber.

Claims

1. A fiber laser comprising:

a signal light source that outputs a signal light;

a rare earth-doped fiber that amplifies and outputs the signal light from the signal light source;

a Raman amplifying fiber that is routed as a portion of an optical transmission path in order to output the output light from the rare earth-doped fiber to an outside thereof; and

a wavelength selecting element that is provided in the optical transmission path from the Raman amplifying fiber to the signal light source and does not allow transmission of a Stokes light that is generated in the Raman amplifying fiber.

2. The fiber laser according to claim 1, wherein the signal light source is a fiber laser.

3. The fiber laser according to claim 1, wherein the signal light source is a Q-switch pulsed light source.

6. The fiber laser according to any one of claims 1 to 5, wherein the Raman amplifying fiber is a photonic band gap fiber, and the photonic band gap fiber does not include the wavelength of a second-order Stokes light of the signal light.

7. The fiber laser according to any one of claims 1 to 5, wherein the rare earth-doped fiber is a rare earth-doped double clad fiber.

4. A fiber laser comprising:

a signal light source that outputs a signal light;

a rare earth-doped fiber that amplifies and outputs the signal light from the signal light source;

a Raman amplifying fiber that is routed as a portion of an optical transmission path that guides the output light from the signal light source to one end of the rare earth-doped fiber; and

a wavelength selecting element that is provided in the optical transmission path from the Raman amplifying fiber to the signal light source and does not allow transmission of a Stokes light that is generated in the Raman amplifying fiber.

5. A fiber laser comprising:

a signal light source that outputs a signal light;

a Raman amplifying fiber that is routed as a portion of an optical transmission path in order to output the output light from the signal light source to the outside; and

a wavelength selecting element that is provided in the optical transmission path from the Raman amplifying fiber to the signal light source and does not allow transmission of a Stokes light that is generated in the Raman amplifying fiber.