Dispersion managed fiber stretcher for high-energy short pulse femotosecond fiber laser system
a fiber laser system and fiber laser technology, applied in the direction of laser details, basic electric elements, electrical equipment, etc., can solve the problems of depleting signal power, limited fiber laser systems, and ordinary skill in the art still face technical limitations and difficulties
Inactive Publication Date: 2009-03-26
LIU JIAN
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Benefits of technology
This approach enables efficient pulse stretching and compression, improving pulse quality and scalability, as demonstrated by a 40% pulse width reduction in a 10 micro-Joule high-energy fs fiber laser system.
Problems solved by technology
Even though current technologies of fiber laser have made significant progress toward achieving a compact and reliable fiber laser system providing high quality output laser with ever increasing output energy, however those of ordinary skill in the art are still confronted with technical limitations and difficulties.
Specifically, in a fiber laser system implemented with the Chirped Pulse Amplification (CPA) for short pulse high power laser amplifier, the fiber laser systems are still limited by the technical difficulties that 1 mJ high energy femtosecond fiber laser requires multiple improvements in terms of fiber design, high power amplification, nonlinear effects mitigation, and stretching and compression operations.
There is a first challenge of the nonlinear effects.
When the peak power goes up to 100 kW, strong nonlinear effects such as self phase modulation (SPM) and stimulated Raman scattering (SRS) cause more serious problems in depleting signal power in the high power fiber laser, even though a large mode area (LMA) fiber be used to reduce SRS / SPM and increase saturation power.
Thus the third order dispersion (TOD) limits the scalability of the laser systems.
There are additional difficulties in power extraction when the Yb-fibers are implemented due to the low extraction of the power output from the fiber.
Furthermore, a long compression stage is required due to the longer stretched pulses at 1 to 10 ns pulse-width and that increases the size and costs of such laser systems.
Method used
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[0017]Referring to FIG. 1 for a schematic diagram of a short pulse high-energy fiber laser system that includes a laser seed 15 having an oscillator for generating a fiber-based mode-locking laser with original pulse duration. The laser project from the oscillator of the seed laser 15 is projected into a laser stretcher 20 to stretch the laser pulse of this invention. The stretcher 20 chirps laser pulse with stretched pulse width is projected into a series of laser amplifiers 25 to amplify the laser into higher energy. The amplified laser is then projected into a pulse compressor 30 to re-compress the pulse width of the laser to output a laser with original pulse width. The pulse stretcher is implemented with a special dispersion management fiber that has a flat dispersion or a negative slope of dispersion versus wavelength.
[0018]FIG. 2 is a diagram for illustrating the fiber dispersion index profile at different wavelength that may be implemented in the stretcher 20 of FIG. 1. In a...
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A fiber Chirped Pulse Amplification (CPA) laser system that includes a fiber mode-locking oscillator for generating a seed laser for projecting to a stretcher for generated a pulse-stretched laser for projecting to a multiple stage amplifier. The multiple stage amplifier further amplifying said laser for projecting to a compressor for compressing said laser to generate an output laser of an original pulse width. In this invention, pulse stretcher is implemented with a special dispersion management fiber that has a flat dispersion or a negative TOD (dispersion slope, or a slope of dispersion versus wavelength).
Description
[0001]This Formal application claims a Priority Date of Mar. 6, 2006 benefit from a Provisional Patent Applications 60 / 781,434 filed by the same Inventor of this Application. The disclosures made in 60 / 781,434 are hereby incorporated by reference in this patent application.FIELD OF THE INVENTION[0002]The present invention relates generally to apparatuses and methods for providing fiber laser system. More particularly, this invention relates a system configuration implemented with pulse stretching management for dispersion compensation for providing a practical approach to provide a femtosecond fiber laser with one mJ level of energy.BACKGROUND OF THE INVENTION[0003]Even though current technologies of fiber laser have made significant progress toward achieving a compact and reliable fiber laser system providing high quality output laser with ever increasing output energy, however those of ordinary skill in the art are still confronted with technical limitations and difficulties. Spec...
Claims
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IPC IPC(8): H01S3/30
CPCH01S3/0057H01S3/06754H01S3/06725H01S3/067
InventorLIU, JIAN
OwnerLIU JIAN