Method for exciting light for optical amplification medium fiber, structure for emitting excited light into optical amplification medium fiber optical fiber amplifier, and uses

Abstract

An inner clad exposure (14) where an inner clad (2) is exposed is formed by removing a part of an outer clad (4) in a longitudinal direction in the optical amplification medium fiber (10) having a hole layer (3) between the inner clad (2) and the outer clad (4). An end face (23) of the optical fiber for excited light incidence (20) is bonded (bonding part (16)) to an outer periphery (15) of the exposed inner clad (2), and excited light (24) is made incident on the optical amplification medium fiber (10) from the optical fiber for excited light incidence (20). Such excited light incident structure (13) is used for incidence of excited light of the optical fiber amplifier and the optical fiber laser. To provide a photoexciting method of an optical amplification medium fiber, with which excited light can highly efficiently be made incident on the optical amplification fiber and a superior amplification characteristic can be obtained, and to provide an excited light incident structure to the optical amplification medium fiber, an optical fiber amplifier and an optical fiber laser.

Description

[0001] The invention of this application is based on Japanese Patent Application No. 2003-151260 (applied on May 23, 2003) and Japanese Patent Application No. 2003-179850 (applied on June 24, 2003) at the Japan Patent Office, and incorporates the contents thereof application for the invention. technical field [0002] The invention relates to an optical excitation method of an optical amplifying medium fiber used in the fields of information communication, laser medical treatment, and laser processing, an excitation light incident structure for the optical amplifying medium fiber, an optical fiber amplifier and an optical fiber laser. [0003] Additionally, the invention relates to fiber lasers. Background technique [0004] In the past, as a kind of optical amplification medium fiber, such as Figure 12 As shown, an inner cladding layer 102 is provided on the outer periphery of a core 101 to which rare earth elements are added, an outer cladding layer 104 is provided on the...

AI Technical Summary

Problems solved by technology

When the excitation light introduction part burns out, the excitation light is not introduced into the rare earth-doped fiber, the oscillation of the excitation light in the rare earth-doped fiber stops, and there is a problem that laser light cannot be output.

[0027] On the other hand, for the method of introducing the excitation light from the side of the double-clad fiber, since the excitation light is transmitted in a transverse manner in a plurality of optical fibers, the transmission attenuation and scattering of the excitation light occur in the gap between the fibers. loss

[0028] In order to prevent such transmission attenuation and scattering loss, the optical fiber is embedded in an organic adhesive, but the light resistance of the organic adhesive is low

When the intensity of the excitation light is increased to obtain a high-output laser, the organic binder is modified, the transparency is impaired, and the mechanical strength is reduced, so the output power of the laser is often extremely reduced.

In addition, sometimes the whole structure composed of multiple optical fibers is burned, and the laser light cannot be output.

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