35results about How to "Large core diameter" patented technology

An ophthalmic illumination system can include an optical fiber configured to transmit a light beam output by a light source and focused by a condenser. The optical fiber can include proximal, distal, and central portions. The proximal portion can be configured to receive the light beam focused by the condenser. The distal portion can be configured to emit the light beam to illuminate a surgical field. The central portion can extend between the proximal and distal portions. A core diameter of the proximal portion can be larger than core diameters of the central and distal portions. An ophthalmic illumination method can include focusing, using a condenser, a light beam emitted by a light source onto a proximal portion of an optical fiber. The method can also include transmitting, using the optical fiber, the light beam to a surgical field.

An indexable, helical cutting insert has multiple cutting edges. In tone configuration, the cutting insert includes four helical cutting edges. In another configuration, the cutting insert includes eight helical cutting edges. In any configuration, the cutting insert may include at least one axial clearance slash extending from a bottom surface to one of the side walls forming a wiper on an edge of the axial clearance slash. In any configuration, the cutting insert may include at least one inside cutting edge that extends outwardly a distance from the side wall. The helical cutting insert may also include at least one progressive cutting edge and / or at least one helical cutting edge that is curved inwardly to enable the cutting insert to perform machining operations on cutters having different diameters.

A bending-resistant large core diameter high numerical aperture multimode fiber includes a core and a cladding surrounding the core. The core has a radius R1 in a range of 28 to 50 microns, a refractive index profile of a parabola shape with α being in a range of 1.9 to 2.2, and a maximum relative refractive index difference Δ1% max being in a range of 1.9% to 2.5%. The cladding includes an inner cladding and / or a trench cladding, and an outer cladding disposed from the inner to the outer in sequence. The radius R2 of the inner cladding is in a range of 28 to 55 microns, and the relative refractive index difference Δ2% is −0.1% to 0.1%. The radius R3 of the trench cladding is in a range of 28 to 60 microns, and the relative refractive index difference Δ3% is in a range of −0.15% to −0.8%.

Few mode optical fibers for mode division multiplexing. The Few Mode Fiber supporting 25 or 30 LP guided modes and includes a graded index core with a α-profile, a radius R1 (at 0 refractive index difference) between 21.5 and 27 μm and a maximum refractive index difference Dn1 between 12.5×10−3 and 20×10−3, and an end of the α-profile at a radius R1b, with index difference Dn1b; a trench surrounding the core with radius R3 between 30 and 42 μm and refractive index difference Dn3 between −15.10−3 and −6.10−3, an intermediate depressed trench with a radius R2, with R1b<R2<R3 and a refractive index difference Dn2, with Dn3<Dn2<0, wherein: for |Dn1b−Dn2|>=0.5×10−3, Min(Dn1b, Dn2)≤−1.5×10−3, and for |Dn1b−Dn2|<0.5×10−3, Dn2 is between −5×10−3 and −3.5×10−3.

An indexable, helical cutting insert includes at least one axial clearance slash extending from a bottom surface to one of said side walls forming a wiper on an edge of the axial clearance slash. In another embodiment, the cutting insert includes at least one inside cutting edge that extends outwardly a distance from the side wall. In another embodiment, the helical cutting insert includes at least one progressive cutting edge. In another embodiment, the cutting insert includes at least one helical cutting edge that is curved inwardly to enable the cutting insert to perform machining operations on cutters having different diameters.

In the method for generating blue laser light with high optical and electrical efficiency, wherein the improvement comprises the step of using a phosphate glass photonic crystal fiber rod as a gain medium.

The invention discloses a method for directly generating intermediate infrared super-continuum spectrum in an amplifier and aims to solve the problem that an existing intermediate infrared super-continuum spectrum optical fiber laser is low in output power and conversion efficiency. The technical scheme includes that an intermediate infrared super-continuum spectrum generation system, consisting of a pulse seed light source, a seed amplifier and a super-continuum spectrum amplifier, is firstly built; and the super-continuum spectrum amplifier consists of a pump light source, a combiner and a gain optical fiber. The power of the output light, namely the seed light, of the pulse seed light source is amplified by using the seed amplifier to generate signal laser; the signal laser and the output laser of the pump light source are combined by using the combiner to enter the gain optical fiber, so that the light source output of the intermediate infrared super-continuum spectrum is obtained. With the adoption of the method for directly generating intermediate infrared super-continuum spectrum in the amplifier, the limitation of core diameter on the output power of the super-continuum spectrum is broken through, the light-to-light, namely from semiconductor pump light to super-continuum spectrum, conversion efficiency is greatly improved, and the output of an intermediate infrared super-continuum spectrum light source with high power and high conversion efficiency is realized.

The invention relates to a U-shaped plastic optical fiber liquid refractive index sensor with a multi-groove structure, and belongs to the technical field of optical fiber sensors. The U-shaped plastic optical fiber liquid refractive index sensor consists of a light source, a U-shaped plastic optical fiber probe with a multi-groove structure, and a photoelectric detection device. The U-shaped plastic optical fiber probe with the multi-groove structure is characterized in that a plastic optical fiber is vertically arranged at the lower surface of a steel die of which the surface provided with a cross section of a triangular sawtooth structure, and the vertexes of a triangle point to a center line of the plastic optical fiber; the pressure is applied to the steel die by a clamp, and the multi-groove structure with multiple V-shaped grooves is pressed along a fiber core of a centerline cross section of the plastic optical fiber by the triangular sawtooth structure of the die; then, the plastic optical fiber and the opposite other side surface of the multi-groove structure are wound on a cylindrical steel cylinder which is heated to about 75 to 95 DEG C; finally, about 3 to 6N tension is applied to both ends of the optical fiber. The U-shaped plastic optical fiber liquid refractive index sensor has the characteristics that the structure and preparation technology are simple, the cost is low, and the sensitivity is high.

An ophthalmic illumination system can include an optical fiber configured to transmit a light beam output by a light source and focused by a condenser. The optical fiber can includeproximal, distal, and central portions. The proximal portion can be configured to receive the light beam focused by the condenser. The distal portion can be configured to emit the light beam to illuminate a surgical field. The central portion can extend between the proximal and distal portions. A core diameter of the proximal portion can be larger than core diameters of the central and distal portions. An ophthalmic illumination method can include focusing, using a condenser, a light beam emitted by a light source onto a proximal portion of an optical fiber. The method can also include transmitting, using the optical fiber, the light beam to a surgical field.

The invention discloses a precision milling cutter and a processing method thereof. The milling cutter comprises a cutter body and a plurality of cutter teeth at the periphery of the cutter body, wherein a flat section is arranged between every two cutter teeth to form a flat bottom surface on the bottom of a spiral groove between the two cutter teeth, the flat bottom surfaces and the spiral grooves are arranged on the cutter body according to the same helical angle, and all points on the flat bottom surfaces are equally far away from an axis of the milling cutter. According to the precision milling cutter, by virtue of the flat sections, the distance between every two cutter teeth increases, so that a chip removal space of the milling cutter is enlarged, and chips can be discharged smoothly. By virtue of the flat sections, the distance between every two cutter teeth increases, so that rake angles of cutting edges can be large to allow the cutting edges to be sharp, while back angles of the cutting edges can be reduced correspondingly to ensure the thickness of the cutter teeth so as to avoid tooth breakage. Moreover, by virtue of the flat sections, the bottoms of the spiral grooves are flattened, so that the core diameter of the milling cutter can be enlarged to improve the strength of the milling cutter, and further, the rate of cutter breakage can be lowered.