A fiber laser includes: a solid laser fiber doped with a rare earth element; a first grating fiber provided at one end portion of both ends along an optical axis direction of the solid laser fiber; and a first reflective element provided at the other end portion of the solid laser fiber. The first a
A fiber laser includes: a solid laser fiber doped with a rare earth element; a first grating fiber provided at one end portion of both ends along an optical axis direction of the solid laser fiber; and a first reflective element provided at the other end portion of the solid laser fiber. The first and second reflective elements constitute a resonator structure for the solid laser fiber; the first grating fiber Bragg-reflects only two polarizations of a first polarization having a first wavelength, and a second polarization having a second wavelength different from the first wavelength and being mutually orthogonal with the first polarization in a polarization direction; and at least one reflection wavelength of light which is reflected at the first reflective element and either one wavelength of the two polarizations which are Bragg-reflected at the first grating fiber coincide with each other.
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1-23. (canceled) 24. A fiber laser comprising: a solid laser fiber doped with a rare earth element; a first grating fiber provided at one end portion of both ends along an optical axis direction of the solid laser fiber; and a first reflective element provided at the other end portion of the solid
1-23. (canceled) 24. A fiber laser comprising: a solid laser fiber doped with a rare earth element; a first grating fiber provided at one end portion of both ends along an optical axis direction of the solid laser fiber; and a first reflective element provided at the other end portion of the solid laser fiber, wherein the first grating fiber and the first reflective element constitute a resonator structure for the solid laser fiber, wherein the first grating fiber Bragg-reflects only two polarizations of a first polarization having a first wavelength, and a second polarization having a second wavelength different from the first wavelength and being mutually orthogonal with the first polarization in a polarization direction, and wherein at least one reflection wavelength of light which is reflected at the first reflective element and either one wavelength of the two polarizations, which are Bragg-reflected at the first grating fiber, coincide with each other. 25. The fiber laser according to claim 24, wherein the first reflective element is a dielectric multilayer film which has a narrowband transmission characteristic at a wavelength λ0, wherein the wavelength λ0 coincides with either one wavelength of two wavelengths Bragg-reflected at the grating fiber, the two Bragg-reflection wavelengths being mutually orthogonal in a polarization direction. 26. The fiber laser according to claim 24, wherein the first reflective element is a dielectric multilayer film of a sharp cut filter which has a wavelength λ1 at a boundary, wherein the wavelength λ1 is located between two wavelengths Bragg-reflected at the grating fiber, the two Bragg-reflection wavelengths being mutually orthogonal in a polarization direction. 27. The fiber laser according to claim 25, wherein the first reflective element is a reflective optical system in which light is retrieved from the other end portion of the solid laser fiber to the outside; after that, the light is transmitted through the dielectric multilayer film; and then, the reflected light is returned from the other end portion to the inside of the solid laser fiber. 28. The fiber laser according to claim 24, wherein the first reflective element is a second grating fiber which Bragg-reflects only a third polarization having a third wavelength and a fourth polarization having a fourth wavelength different from the third wavelength and being mutually orthogonal with the third polarization in a polarization direction; and wherein either one polarization of two polarizations Bragg-reflected at the first grating fiber, and either one polarization of two polarizations Bragg-reflected at the second grating fiber coincide with each other in a polarization direction and Bragg-reflection wavelength. 29. The fiber laser according to claim 28, wherein the first grating fibers has two mutually orthogonal polarizations, and the second grating fibers has two mutually orthogonal polarizations, respectively; a wavelength λ1 of the first polarization and a wavelength λ2 of the second polarization, both of which are Bragg-reflected at the first grating fiber, satisfy a relation of λ1>λ2; a wavelength λ3 of the third polarization and a wavelength λ4 of the fourth polarization, both of which are Bragg-reflected at the second grating fiber, satisfy a relation of λ3>λ4; and the wavelengths satisfy either a relation of λ1=λ4 or λ2=λ3. 30. The fiber laser according to claim 28, wherein the first wavelength of the first polarization which is Bragg-reflected at the first grating fiber and the fourth wavelength of the fourth polarization which is Bragg-reflected at the second grating fiber coincide with each other. 31. The fiber laser according to claim 28, wherein the second wavelength of the second polarization which is Bragg-reflected at the first grating fiber and the third wavelength of the third polarization which is Bragg-reflected at the second grating fiber coincide with each other. 32. The fiber laser according to claim 24, wherein the solid laser fiber has a complex refractive index; and a polarization direction of the first grating fiber and a polarization direction of the solid laser fiber coincide with each other. 33. The fiber laser according to claim 28, wherein the solid laser fiber has a complex refractive index; and either one polarization of the two polarizations of the solid laser fiber, the first polarization of the first grating fiber, and the fourth polarization of the second grating fiber coincide with one another. 34. The fiber laser according to claim 24, further comprising: a third grating fiber provided at one end portion of both ends of the first grating fiber in an optical axis direction, the one end portion being arranged on the opposite side of an end portion which comes in contact with the solid laser fiber; and a second reflective element provided at one end portion of both ends of the first reflective element in the optical axis direction, the one end portion being arranged on the opposite side of an end portion which comes in contact with the solid laser fiber, wherein the first grating fiber and the first reflective element constitute a resonator structure for the solid laser fiber, wherein the third grating fiber and the second reflective element constitute a resonator structure for the solid laser fiber, wherein the third grating fiber Bragg-reflects only two polarizations of a fifth polarization having a fifth wavelength and a sixth polarization having a sixth wavelength different from the fifth wavelength and being mutually orthogonal with the fifth polarization in a polarization direction, and wherein at least one reflection wavelength of light reflected at the second reflective element and a wavelength of either one polarization of the two polarizations which are Bragg-reflected at the third grating fiber coincide with each other. 35. The fiber laser according to claim 34, wherein the second reflective element is a dielectric multilayer film. 36. The fiber laser according to claim 34, wherein the second reflective element is a fourth grating fiber which Bragg-reflects only a seventh polarization having a seventh wavelength and a eighth polarization having an eighth wavelength different from the seventh wavelength and being mutually orthogonal with the seventh polarization in a polarization direction; and the third grating fiber and the fourth grating fiber coincide with each other in a polarization direction and Bragg-reflection wavelength of one polarization of respective two polarizations to be Bragg-reflected. 37. The fiber laser according to claim 36, wherein the third and fourth grating fibers have each two mutually orthogonal polarizations; a wavelength λ5 of the fifth polarization and a wavelength λ6 of the sixth polarization, both of which are Bragg-reflected at the third grating fiber, satisfy a relation of λ5>λ6; a wavelength λ7 of the seventh polarization and a wavelength λ8 of the eighth polarization, both of which are Bragg-reflected at the fourth grating fiber, satisfy a relation of λ7>λ8; and the wavelengths satisfy either a relation of λ5=λ8 or λ6=λ7. 38. The fiber laser according to claim 36, wherein the fifth wavelength of the fifth polarization which is Bragg-reflected at the third grating fiber and the eighth wavelength of the eighth polarization which is Bragg-reflected at the fourth grating fiber coincide with each other. 39. The fiber laser according to claim 36, wherein the sixth wavelength of the sixth polarization which is Bragg-reflected at the third grating fiber and the seventh wavelength of the seventh polarization which is Bragg-reflected at the fourth grating fiber coincide with each other. 40. The fiber laser according to claim 24, wherein the solid laser fiber includes at least one from a group including Yb, Er, Nd, Pr, Cr, Ti, V, and Ho. 41. The fiber laser according to claim 24, wherein the reflection wavelength of the light reflected at the first reflective element is near 1060 nm. 42. The fiber laser according to claim 34, wherein the reflection wavelength of the light reflected at the second reflective element is near 1550 nm. 43. The fiber laser according to claim 24, further comprising a wavelength conversion element which converts an output derived from the fiber laser to a harmonic. 44. The fiber laser according to claim 24, further comprising a plurality of wavelength conversion elements which convert an output derived from the fiber laser to harmonics having a plurality of different wavelengths. 45. The fiber laser according to claim 43, wherein the wavelength conversion element includes at least one selected from a group of Mg doped LiNbO3 having a periodic polarization inversion structure, Mg doped LiTaO3, KTiOPO4, Mg doped LiNbO3 of stoichiometric composition, and Mg doped LiTaO3 of stoichiometric composition. 46. The fiber laser according to claim 24, further comprising a pump light source which inputs excitation light from either one end portion of the both sides of the solid laser fiber. 47. The fiber laser according to claim 24, further comprising a metal substrate with high thermal conductivity, wherein the first reflective element is a second grating fiber which Bragg-reflects light having the same wavelength as either one polarization of the two polarizations which are Bragg-reflected at the first grating fiber, and the first grating fiber and the second grating fiber are positioned proximate to the metal substrate. 48. The fiber laser according to claim 47, wherein the grating fiber is a double clad fiber. 49. The fiber laser according to claim 24, further comprising: a polarization-preserving solid laser fiber doped with Yb and Er; first and fourth grating fibers provided at one end portion of both ends along an optical axis direction of the solid laser fiber; and third and second grating fibers provided at the other end portion of the solid laser fiber, wherein the first and second grating fibers constitute a resonator of a wavelength λ1 at only one polarization of the solid laser fiber, and wherein the third and fourth grating fiber constitute a resonator of a wavelength λ2 at only the other polarization of the solid laser fiber. 50. The fiber laser according to claim 49, wherein the light of the λ1 and the light of the λ2 are mutually orthogonal in an polarization direction. 51. The fiber laser according to claim 50, wherein the wavelength λ1 is near 1550 nm, the wavelength λ2 is near 1660 nm. 52. The fiber laser according to claim 50, wherein the wavelength λ1 is near 1060 nm, the wavelength λ2 is near 1550 nm.
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