摘要:
An optical fiber for converting a Gaussian laser beam into a Bessel laser beam may include a first segment optically coupled to a second segment with a transition region, the first segment having a first outer diameter greater than a second outer diameter of the second segment. The first segment may include a first core portion with a first cladding portion extending around the first core portion. The second segment may include a second core portion with a second cladding portion extending around the second core portion. The optical fiber may have a non-axisymmetric refractive index profile or may be coupled to an end cap with a non-axisymmetric refractive index profile.
摘要:
A light-diffusing optical fiber having nanostructured inner and outer core regions is disclosed. The nanostructured inner core region (30) is defined by a first configuration of voids (34) that defines a first amount of light scattering. The outer core region (50) is defined by a second configuration of voids (54) that defines a second amount of light scattering that is different from the first amount of light scattering. A cladding (100) surrounds the nanostructured core. Light scattered out of the inner core region scatters from the outer core region and then out of the cladding as scattered light. Selective bending of the light-diffusing optical fiber is used to define a bending configuration that allows for tailoring the intensity distribution of the scattered light emitted from the fiber as a function of the length of the fiber.
摘要:
The present invention is directed to an optical fiber that includes a glass core region (20) that has nano-sized structures (32) configured to scatter light propagating in the glass core region (20). The glass core region (20) has an average refractive index n av g. The fiber includes an interior glass cladding region (40-1) that has an interior cladding refractive index n 2 that is less than n av g. The fiber includes an outer cladding region (40-2) that has an outer cladding refractive index n 3 that is less than n 2 . A refractive index difference of n 2 - n 3 corresponds to a bend uniformity diameter; the light exiting the outer cladding (40-2) at a fiber bending location is substantially nonuniform when a bending diameter of the fiber bending location is less than the bend uniformity diameter.
摘要:
An optical active fiber is configured with an asymmetrically-shaped core having at least one long axis and a shortest axis which extends transversely to the long axis. The outmost cladding of the active fiber is configured with a marking indicating the orientation of the short axis. The marking allows for bending the fiber so that the shortest axis extends along and lies in the plane of the bend thereby minimizing distortion of a mode which is guided by the asymmetrically-shaped core as light propagates along the bend.
摘要:
An optical fibre has a waveguide structure wtih a core (2) extending along the longitudinal direction. A cladding layer (6) extends around the core in the same direction. The cladding ladding layer includes a photonic band gap region with radial air holes (8) arranged in a longitudinal and circumferential two-dimensional lattice to define a photonic band gap structure with a forbidden band gap at a predetermined range of wavelengths, light in the forbidden band gap not being able to propagate in the photonic band gap region.
摘要:
The invention relates to optical fibers for use in optical amplification of light, such as in optical fiber amplifiers and lasers and for use in delivery of high power light, in particular to a scheme for reducing amplified spontaneous emission at undesired wavelengths. The invention further relates to articles, methods and use. An object of the invention is achieved by a micro- structured optical fiber, which is adapted to guide light by the photonic bandgap effect and to have one or more pass bands and at least one stop- band over a wavelength range from ? stop1 to ? stop2- In an aspect of the invention, the at least one stop-band provides filter functions that suppress nonlinear effects. In another aspect, the core region is actively doped, and the active material has an emission spectrum with a higher value of the emission cross section s E at a wavelength ? ASE between ? stop1 and ? stop2 than outside said wavelength range such that amplified spontaneous emission and lasing within the wavelength range from ? stop1 to ? stop2 is reduced. In still another aspect, the optical fiber exhibits photonic bandgaps at different wavelength ranges in different radial directions of a cross section of the optical fiber.
摘要:
An optical fiber including: (i) a silica based, rare earth doped core having a first index of refraction n 1 ; (ii) a silica based inner cladding surrounding the core and having a second index of refraction n 2 , such that n 1 > n 2 , said inner cladding having a plurality of air holes extending longitudinally through the length of said optical fiber; (iii) a silica based outer cladding surrounding said inner cladding and having a third index of refraction n 3 , such that n 2 > n 3 ; wherein said optical fiber supports a single polarization mode within the operating wavelength range.
摘要翻译:一种光纤,包括:(i)具有第一折射率n 1的二氧化硅基稀土掺杂的芯; (ii)围绕所述芯并且具有第二折射率n 2 2的基于二氧化硅的内包层,使得n 1,N 2, 所述内包层具有沿着所述光纤的长度纵向延伸的多个气孔; (iii)围绕所述内包层并具有第三折射率n 3 3的基于二氧化硅的外包层,使得n 2 N 3 N 3 ; 其中所述光纤在工作波长范围内支持单一偏振模式。