Spectrum broadening and recompression in high-energy fiber laser system

• US 20070047595A1
• Filed: 08/29/2006
• Published: 03/01/2007
• Est. Priority Date: 08/29/2005
• Status: Abandoned Application

• Current Assignee: Polaronyx, Inc.
• Original Assignee: Polaronyx, Inc.
• Inventors: Liu, Jian, Xia, Jiangfan
• Application Number:
  US11/512,554
• Publication Number:
  US 20070047595A1
• Time in Patent Office: Days
• US Class Current: 372/6
• CPC Class Codes: H01S 3/0057 Temporal shaping, e.g. pulse compression, frequency chirping soliton generation and propagation G02F1/3513, H01S3/063 and H01S3/108
• CPC Class Codes: H01S 3/067 Fibre lasers
• CPC Class Codes: H01S 3/06725 Fibre characterized by a specific dispersion, e.g. for pulse shaping in soliton lasers or for dispersion compensating [DCF]
• CPC Class Codes: H01S 3/06758 Tandem amplifiers

Abstract

A fiber Chirped Pulse Amplification (CPA) laser system includes a fiber mode-locking oscillator for generating a laser for projecting to a fiber stretcher for stretching a pulse width of the laser. The fiber CPA laser further includes a multistage amplifier for amplifying the laser for projecting into a pulse shaper then to a compressor having a nonlinear phase generator for compensating high order dispersions and compressing the pulse width of the laser. The pulse shaper is further provided to minimize a nonlinear phase shift inside the multistage amplifier for reducing a Stimulated Raman Scattering (SRS

Claims

1. A Chirped Pulse Amplification (CPA) fiber laser system comprising:

a fiber mode-locking oscillator for generating a laser for projecting to a fiber stretcher for stretching a pulse width of said laser; and

a multistage amplifier for amplifying said laser for projecting into a pulse shaper then to a compressor having a nonlinear phase generator for compensating high order dispersions and compressing said pulse width of said laser.

2. The CPA fiber laser system of claim 1 wherein:

said pulse shaper is further provided to minimize a nonlinear phase shift inside said multistage amplifier for reducing a Stimulated Raman Scattering (SRS).

3. The CPA fiber laser system of claim 1 wherein:

said CPA fiber laser system providing a controllable nonlinear phase shift and a self phase modulation (SPM).

4. The CPA fiber laser system of claim 1 wherein:

said nonlinear phase generator in said compressor is after said laser is amplified and said nonlinear phase is proportionally increased according to an amplification factor provided by said multistage amplifier.

5. The CPA fiber laser system of claim 1 wherein:

said nonlinear phase generator in said compressor is controllable for generating predefined nonlinear phase shift for adjustably compensating said high order dispersions.

6. The CPA fiber laser system of claim 1 wherein:

said multistage amplifier further comprising a large mode area double cladding fiber.

7. The CPA fiber laser system of claim 1 wherein:

said pulse shaper further comprising an un-doped large mode area double cladding fiber to shape a pulse shape of said laser for improving a compressibility of said laser.

8. The CPA fiber laser system of claim 1 wherein:

said pulse shaper further comprising an un-doped large mode area double cladding fiber to introducing spectral components coherent with a broadband laser induced by said SPM for achieving reduce a pulse width of said laser.

9. The CPA fiber laser system of claim 1 wherein:

said multistage amplifier comprising a Yb fiber as a gain medium.

10. The CPA fiber laser system of claim 1 wherein:

said multistage amplifier comprising a Yb fiber as a gain medium for a laser having a wavelength substantially 1030 nm with a bandwidth approximately 8 nm having a pulse width around 200 fs.

11. The CPA fiber laser system of claim 1 wherein:

said laser having a wavelength bandwidth approximately 30 nm for generating an output laser having a pulse width below 200 fs.

12. The CPA fiber laser system of claim 1 wherein:

said laser having a wavelength bandwidth approximately 30 nm for generating an output laser having a pulse width below 200 fs and a power at approximately a mJ level.