Fiber laser device and light amplifying method
A fiber laser and optical amplification technology, which is applied in the direction of lasers, laser components, phonon exciters, etc., to achieve the effect of small and high output power
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Embodiment approach 1
[0038] The optical amplifying fiber 20 is composed of a first optical waveguide 21 that utilizes incident excitation light and transmits the excitation light, a second optical waveguide 22 that is composed of a core 23 that generates laser light by adding a laser medium, and a cladding layer 24 that transmits the excitation light. , and the third optical waveguide 25 including the first optical waveguide 21 and the second optical waveguide 22 constitute a multi-core (multiple optical waveguides) structure.
[0039] In detail, the first optical waveguide 21 is an excitation optical waveguide with a diameter of 125 microns made of quartz glass into which excitation light is incident and transmitted. The second optical waveguide 22 uses quartz glass as a base material and has a D-shaped cross-section, which absorbs excitation light and generates laser light. The third optical waveguide 25 is filled with a filler that is adjusted to efficiently guide the excitation light from the ...
Embodiment approach 2
[0064] When the refractive index n1 of the first optical waveguide 21 is compared with the refractive index n4 of the third optical waveguide 25 surrounding the first optical waveguide 21, it is defined as n1
[0065] The ratio of excitation light leaking to the third optical waveguide 25 while propagating through the first optical waveguide 21 is determined by the curvature radii of the first optical waveguide 21 and the third optical waveguide 25 . That is, the mode of light that can be transmitted by the first optical waveguide 21 is determined depending on the radius of curvature of the optical amplifying fiber 20 . The optical modes that cannot be transmitted leak out to the third optical waveguide 25 .
[0066] In this embodiment, since the radius of curvature is reduced from the reflection end toward the emission end, the mode in which the light of the first o...
Embodiment approach 3
[0078] In addition, the second optical waveguide 62 is composed of a core 63 with a diameter of 30 micrometers doped with ytterbium as a laser medium to transmit multimode, and a cladding with a representative diameter of 125 micrometers as a quartz glass base material that encloses the laser light generated by excitation. A coating 64 is formed. If the refractive index of the first optical waveguide 61 is set as n1, the refractive index of the cladding layer 64 of the second optical waveguide 62 is set as n2, the refractive index of the core 63 is set as n3, and the refractive index of the third optical waveguide 65 is set as n4 and the refractive index of the outer layer 66 as n5, it can be configured such that n5
[0079] As for both ends of the optical amplification fiber 60 , the first optical waveguide 61 and the second optical waveguide 62 are exposed from the third optical waveguide 65 . One ...
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