Abstract:
The hybrid photonic crystal fiber comprises a single core (4) having a refractive index (n core ) and surrounded by a cladding (1), the cladding (1) comprising a background material having a refractive index (n1), high index inclusions (2) and low index inclusions (3) embedded in said background material (1); said high index inclusions (2) comprise solid inclusions having a refractive index (n 2 ) that is higher than the refractive index (n 1 ) of the background material (1) and higher than the refractive index (n core ) of the core (4), the difference (n 2 -n core ) between the refractive index (n 2 ) of said high index solid inclusions and the refractive index (n core ) of the core (4) being preferably not more than 0.05; said low index inclusions (3) have a refractive index (n 3 ) that is lower than the refractive index (n core ) of the core (4); all the high index inclusions (2) form one inner ring (HIR) or two concentric inner rings (HIR 1 ; HIR 2 ) surrounding the core (4), and all the low index inclusions (3) form two or more concentric outer rings (LIR 1 ; LIR 2 ) surrounding said inner ring of high index inclusions (2) or surrounding said two concentric inner rings of high index inclusions (2); an index-guided core mode (TIR mode) exists for wavelengths higher than a wavelength cutoff value λο, that can be between 400nm and 1800nm, and a bandgap guided core mode within the first band gap exists at least at wavelengths lower than said wavelength cutoff value.
Abstract:
A few-mode optical fiber comprises a core surrounded by a cladding, having a graded index profile that is structured to support propagation of a plurality of desired signal-carrying modes, while suppressing undesired modes. The core and cladding are configured such that the undesired modes have respective effective indices that are close to. or less than, the cladding index such that the undesired modes are leaky modes. The index spacing between the desired mode having the lowest effective index and the leaky mode with the highest effective index is sufficiently large so as to substantially prevent coupling therebetween.
Abstract:
The invention relates to an arrangement for supplying luminous energy to biological structures, comprising a pumping light source and/or a laser source, an optical beam forming system, and an optical waveguide which is coupled to the beam forming device to create a light intensity profile dependent on the full length of the waveguide and/or a change in shape and which comprises a core and a cladding surrounding the core, a distal fiber end being free. The arrangement is characterized by a depressed refractive index structure which extends across the core and the cladding and consists of a succession of concentric zones that are designed, in at least some sections in the radial direction, as an alternating succession of regions having a relatively low refractive index and a relatively high refractive index. In a method for producing an optical waveguide for an arrangement for supplying luminous energy in a targeted manner to biological structures, a diffractive index profile that is variable in the longitudinal direction of the optical waveguide is created by providing a glass tube having a first refractive index, coating the glass tube with at least one coating having a second refractive index, drawing the coated glass tube to create a capillary, and collapsing the capillary within a specific area and along a specific length to create a collapsed section.
Abstract:
According to some embodiments the triple-clad optical fiber comprises a core, a first inner cladding, a second inner cladding, and an outer cladding wherein: (i) the core comprises a radius r 0 a first index of refraction n 0 ; (ii) the first inner cladding surrounds the core and has a numerical aperture of at least about 0.12, and a second index of refraction n 1 such that n 1 0 , (iii) the second inner cladding surrounds the first inner cladding a numerical aperture of at least about 0.2, and a second index of refraction n 2 such that n 2 >n 1 , wherein a relative refractive index percent (Δ%) of the second cladding relative to the outer cladding is greater 1%; and (iv) the outer cladding surrounds the second inner cladding and has a third index of refraction n 3 such that n 3 2 , and n 3 1 .
Abstract:
A first optical fiber (12) having a first end and a second end is connected to a multimode second optical fiber (14) at the second end. The first optical fiber (12) outputs a substantially single mode optical beam at its second end. The multimode second optical fiber (14) converts light in the optical beam of single mode from the first optical fiber to light of multiple modes, and provides an output beam that has less diffractive spreading than that of a Gaussian beam.
Abstract:
An optical fiber having at least a first central core segment, said central core segment comprising at least a first region having a width no more than.2 µm over a core delta % of.1 or greater. The first core region may also over a delta height of at least.15 delta % exhibits a profile volume less than 0.1. Such core segments can facilitate optical fibers which exhibit an L01 acousto-optic effective area which is greater in magnitude than the L02 acousto optic effective area.
Abstract:
An optical fiber having at least a first central core segment, said central core segment comprising at least a first region having a width no more than.2 μm over a core delta % of.1 or greater. The first core region may also over a delta height of at least.15 delta % exhibits a profile volume less than 0.1. Such core segments can facilitate optical fibers which exhibit an L01 acousto-optic effective area which is greater in magnitude than the L02 acousto optic effective area.