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Cladding-pumped quasi 3-level fiber laser/amplifier

A quasi-three-level and energy-level technology, which is applied in the field of cladding-pumped quasi-three-level fiber laser/amplifier, can solve the problems that the diode does not have enough power, the beam quality cannot be satisfied, and the intensity is not enough.

Inactive Publication Date: 2007-01-10
CORNING INC
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  • Claims
  • Application Information

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Problems solved by technology

[0011] Three-level systems are generally not as efficient as four-level systems
Although semiconductor diodes have the advantage of being smaller, their beam quality is not adequate for many applications, and currently commercially available diodes do not have sufficient power and are not as powerful as flashlights

Method used

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  • Cladding-pumped quasi 3-level fiber laser/amplifier
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  • Cladding-pumped quasi 3-level fiber laser/amplifier

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Embodiment Construction

[0023]For telecommunications, optical fiber is an advantageous transmission medium because of its high capacity and immunity to electrical noise. Silica fiber is relatively inexpensive, and when fabricated as a single transverse mode fiber, it can transmit signals in the 1550-nanometer band over several kilometers without amplification or regeneration. However, optical amplification is still required in many fiber optic networks because of the large transmission distances involved, or because the optical signal is split into many paths. Erbium-Doped Fiber Amplifiers (EDFAs) have been found to be quite effective in providing the desired optical gain. It is now generally known that an EDFA is an optical fiber that can be used to amplify light input. Erbium rare earth ions are added as dopants to the fiber core material, with typical doping levels of a few hundred per million. At the erbium laser wavelength of 1.5 microns, the fiber is highly transparent. When pumped with a la...

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Abstract

An optically active fiber(30) is disclosed for making a fiber laser(18) or an amplifier(16) for optically pumping by a broad area laser diode for operation in the 1.5 micron band. This double-clad structured active fiber(30) has a core(34), doped with an optically excitable erbium ion having a quasi-three-level transition. The core(34) has a core refractive index and a core cross-sectional area. An inner cladding(32) surrounds the core(34). The inner cladding(32) has an inner cladding refractive index less than the core refractive index, an inner cladding cross-sectional area between 2 and 25 times greater than that of the core cross-sectional area, and an aspect ratio greater than 1.5:1. An outer cladding(36) surrounds the inner cladding(32) and has an outer cladding refractive index less than the inner cladding refractive index.

Description

technical field [0001] The present invention generally relates to in-band, direct, matched or resonant pumping of active erbium-doped fibers for use as high power optical amplifiers and lasers for laser processing, medical applications , remote communication, etc. In particular, the present invention relates to quasi-three-level double-clad fiber lasers and quasi-three-level double-clad fiber amplifiers, which can efficiently generate high-power 1.5 micron band radiation in the eye-safe region of the electromagnetic spectrum. Background technique [0002] The gain medium in a laser or amplifier consists of atoms or ions with various energy levels. A transition is a process whereby a quantum mechanical system changes from one energy level to another. Such energy levels are also known as spectral line bands used to represent electronic transitions in the molecule, which form the electronic band spectrum. During this transition, energy is emitted or absorbed, and usually tak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/094H01S3/0941
CPCH01S3/06716H01S3/067H01S3/09415H01S3/094H01S3/094007H01S3/06708H01S5/2036
Inventor L·C·小胡古伊斯刘兴胜D·T·沃尔顿C·-E·扎L·A·森特诺
Owner CORNING INC
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