Abstract:
The present invention relates to fiber bundles and methods for making fiber bundles. According to one embodiment of the invention, at the endface of the fused fiber bundle, the ratio of the cross-sectional area of the endface to the cross sectional area of the plurality of optical fibers is at least about 2.5. According to another embodiment of the invention, a fused fiber bundle includes a plurality of optical fibers, and a glass tube surrounding the terminal segments of the optical fibers, wherein the refractive index of the glass tube is less than the refractive index of the claddings of the optical fibers. Other embodiments of the present invention provide methods for making fused bundles.
Abstract:
A high power laser system comprising: a master laser; and a primary slave laser oscillator including a cavity comprising a rare earth doped fiber, said primary slave laser oscillator being actively injection-locked to said master laser, wherein said cavity provides an output exceeding 1 W of optical power.
Abstract:
An optical fiber including: (i) a silica based, Yb doped core having a first index of refraction nj, said core comprising more than lwt % of Yb, said core having less than 5 dB/km loss at a wavelength situated between 1150 run and 1350 nm and less than 20 dB/km loss at the wavelength of 1380 nm and slope efficiency of over 0.8; and (ii) at least one silica based cladding surrounding the core and having a second index of refraction n2, such that n\> n2.
Abstract translation:一种光纤,包括:(i)具有第一折射率nj的二氧化硅基Yb掺杂芯,所述芯包括大于1wt%的Yb,所述芯在波长处具有小于5dB / km的损耗,位于1150nm 1350 nm,波长1380 nm时损耗小于20 dB / km,斜率效率超过0.8; 和(ii)至少一个围绕所述芯并且具有第二折射率n2的基于二氧化硅的包层,使得n 1> n 2。
Abstract:
An optical system comprises an optical fiber with gain producing core with an index of refraction n 1 , surrounded by at least one cladding with an index of refraction n 2 , said cladding including at least one index reduced area with an index of refraction n 2 , such that n 1 >n 2 >n 2 , the core propagating signal at a spatial fundamental mode at a signal wavelength ? 1 and at a power level sufficient to generate optical power at a wavelength ? 2 , where ? 2 > ? 1 , and the optical fiber has at least one cut-off fundamental spatial mode wavelength ? c , and ? 1 c and ? 2 >? c .
Abstract:
An optical fiber (10), comprising: (i) a rare earth doped silica based elongated core (12) with a first refractive index (n1 with an aspect ratio of 1.5 to 10; (ii) a silica based moat (13) abutting and at least substantially surrounding the core, the moat having a refractive index n2, wherein n21; (iii) a silica based inner cladding (14) surrounding the moat, the inner cladding having a third refractive index (n3), wherein n1>n3; and n3>n2; (iv) a silica based outer cladding (16) surrounding said inner cladding, the outer cladding having a fourth refractive index (n4), such that n43; the optical fiber exhibits single polarization at the operating wavelength band.
Abstract:
A laser system comprising: a light source generating light, said light source comprising at least two laser sources of different wavelengths; and a frequency converter operatively coupled to said light source to accept the light provided by said light source and to convert it to higher optical frequency such that said frequency converter is producing light output at the final output wavelength situated in the 150-775 nm range.
Abstract:
A fiber lens (100) includes a multimode fiber (104) and a refractive lens (102) disposed at an end of the multimode fiber. The refractive lens (102) focuses a beam from the multimode fiber (104) into a diffraction-limited spot. In one embodiment, a graded-index (fiber) is interposed between the multimode fiber (104) and the refractive lens (102). In one embodiment, the combination of the graded-index (fiber) and the refractive lens enables extreme anamorphic lens characteristics.
Abstract:
An optical fiber including: (i) a silica based, rare earth doped core (12) having a first index of refraction n 1 ; (ii) a silica based inner cladding (14) surrounding the core and having a second index of refraction n 2 , such that n 1 >n 2 , the inner cladding having a plurality of air holes (24, 26) extending longitudinally through the length of the optical fiber; (iii) a silica based outer cladding (16) surrounding the inner cladding and having a third index of refraction n 3 , such that n 2 >n 3 ; wherein the optical fiber supports a single polarization mode within the operating wavelength range.
Abstract:
An optical waveguide fiber having a high threshold for stimulated Brillouin scattering. According to some embodiments of the invention, the optical fiber comprises: (a) a rare earth doped core having a refractive index profile and a centerline, the core including at least two adjacent core regions including different amounts of updopants, such that the longitudinal acoustic field velocities within the two core regions differ by at least 0.2%; and (b) a cladding layer surrounding and directly adjacent the core. The said fiber has MFD of greater than 12 µm and delta % difference between the peak core delta and the cladding of less than 0.3%.
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.