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

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.

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 R_1b, with index difference Dn_1b; 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 R_1b<R₂<R₃ and a refractive index difference Dn₂, with Dn₃<Dn₂<0, wherein: for |Dn_1b−Dn₂|>=0.5×10−3, Min(Dn_1b, Dn₂)≤−1.5×10−3, and for |Dn_1b−Dn₂|<0.5×10−3, Dn₂ is between −5×10−3 and −3.5×10−3.

The invention relates to a fiber laser system without a stretcher. The system comprises a 'figure-eight' cavity mode locking fiber laser, a pulse menu selecting device, a single-mode fiber amplifier, dual-cladding ytterbium-doped photonic fibers, a dichroic mirror, a pumping source, wherein the pulse menu selecting device is connected with the output of the 'figure-eight' cavity mode locking fiber laser through fibers; the single-mode fiber amplifier is connected with the output of the pulse menu selecting device through the fibers; the dual-cladding ytterbium-doped photonic fibers are connected after focusing; the dichroic mirror is connected with the other end of the dual-cladding ytterbium-doped photonic fibers; and the single-mode fiber amplifier is also connected with a single-mode pumping source through the fibers. The fiber laser system solves the technical problems of large volume , high cost, high requirements of accuracy of installation and debugging and the like of large-energy pulsed lasers in the background technology, has the characteristics of large core diameter and single-mode transmission and has the advantage of high quality of amplified laser beams.

A laser optical system using optical fiber transmission, includes a first optical fiber for transmitting laser light emitted from a laser oscillator, a collimator lens for collimating laser light emitted from the first optical fiber, a spherical array lens including a plurality of cells for converging laser light emitted from the collimator lens into a plurality of spots, a plurality of second optical fibers each having a smaller core diameter than the first optical fiber and configured to admit the laser light converged into the corresponding spot by the spherical array lens, the second optical fibers having output ends that have mutually parallel axial lines and are arranged linearly in a single row, and a linearization optical unit for shaping laser light emitted from the second optical fibers into laser light having a linear cross section at an illuminated surface.

The invention discloses a PCB-drilling micro-bit, comprising an base line at the bottom of the groove and two side lines respectively arranged at both sides of the groove and smoothly connected with the base line, which is characterized in that: a spiral winding groove is arranged on the prismatic face; the cross-section profile vertical to the spiral line of the groove is U-shaped with wide bottom on the whole; wherein, the base line is a straight line segment or a circular arc line segment with large curvature radius; the two side lines are respectively straight line segment or circular arc line segment with small curvature radius. Optimally, Helix angle of the groove is 42 to 45 degrees. The invention has the advantages of having bigger space for removing chips and bigger core radius synchronously through optimizing the groove, not decreasing the width of the groove with the groove becoming shallower, having more reasonable groove amplitude ratio of the rear part in the drill bit, improving the quality of drill wall, the hole accuracy, lowering rod-breaking performance synchronously; by increasing the helix angle to 42 to 45 degrees, the invention improves the dust exhausting ability of the drill bit and the quality of hole wall.

An optical communication module configured for enhancing optical coupling efficiency, which includes an optical butt joint receptacle and a light emitting body provided on one side of the optical butt joint receptacle. The optical butt joint receptacle has a receptacle body and a through hole provided in the receptacle body for a dual-core optical fiber to extend through. The receptacle body has a light-receiving side and an optical fiber insertion groove corresponding respectively to two ends of the through hole. The light emitting body includes a housing, a laser semiconductor provided in the housing, and an aperture provided in one side of the housing for aligning with the through hole so as that the laser beam emitted by the laser semiconductor is optically coupled to the dual-core optical fiber. The dual-core optical fiber has different core diameters and numerical apertures to enhance the coupling efficiency and reduce the coupling loss in between with the external optical fiber.

The invention relates to a plastic optical fiber refractive index sensor on the basis of a micropore structure. The plastic optical fiber refractive index sensor comprises a plastic optical fiber used as a substrate and the micropore structure processed on the lateral surface of the plastic optical fiber; the axial direction of a micropore perpendicularly and transversely penetrates through the axial direction of the plastic optical fiber; a light source for providing an optical signal is arranged at one end of the plastic optical fiber; a power meter is arranged at the other end of the plastic optical fiber so as to detect power loss after the light source is spread by the plastic optical fiber. The plastic optical fiber adopted by the plastic optical fiber refractive index sensor is a low-loss optical waveguide and transmission loss in the optical waveguide is ignored under a certain length, and thus, loss of the optical fiber is only related to loss of a sensing head, namely loss of the micropore structure part. According to the invention, a machining method is utilized to make the micropore sensing structure on the lateral surface of the optical fiber; the plastic optical fiber refractive index sensor has the advantages of simple process, high productivity, low cost and the like; and excellent temperature stability enables the structure to have important application in detection of a refractive index.

The invention relates to a double-cladding optical fiber with a Bragg structure, comprises a fiber core 1, an inner cladding layer 2, an outer cladding layer 3 and a protection layer 4, wherein a radial coaxial Bragg structure region with high-low refractive index layers, which are periodically distributed in an overlapping way, is arranged on the inner cladding layer 2. The double-cladding optical fiber has large core diameter and low NA value, realizes the high-power laser ground mode output under the condition of not increasing the size of the inner cladding layer by providing pumping light for the optical fiber, and amplifying and propagating signals passing through the optical fiber, facilitates heat management while high-power laser is output and is suitable for manufacturing a high-power and high beam quality optical fiber laser and an optical fiber amplifier.

The invention discloses an ultraviolet optical system for rapid prototyping comprising an ultraviolet light source generator which is an ultraviolet irradiation device based on the spherical high-pressure mercury lamp, a transmission light conducting mechanism consisting of optical fiber and connection port A and B, and a light gathering mechanism implemented by an optical combination mechanism, wherein the connection port A connects to the ultraviolet light source generator and the connection port B connects to the optical combination mechanism of light gathering mechanism. It is characterized in that the optical fiber in transmission light conducting mechanism is liquid-core optical fiber. The invention can obtain energy stable emergent light matching to the wavelength of the required ultraviolet for rapid prototyping, can high effectively conduct and gather ultraviolet, and ensure required energy and light spot size for solidifying prototyping materials.

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 23 and 27 μm and a maximum refractive index difference Dn₁ between 14.10⁻³ and 17.10⁻³, and an end of the α-profile at a radius R_1b, with index difference Dn_1b; a trench surrounding the core with radius R₃ between 30 and 40 μm and refractive index difference Dn₃ between −15.10⁻³ and −6.10⁻³. Such a FMF shows a specific design of the interface between the core and the cladding such that R_1b>R₁, Dn_1b between −10.10⁻³ and −3.10⁻³, and Dn_1b−Dn_g≥0.9×10⁻².

A light-cone-based forward scatter dust instrument optical system includes a window, an anti-collision sleeve, a connection piece, a rotary rod, an elastic sleeve, an elastic band, an embedding groove, a coating layer I, a cladding layer I, a buffer zone I, a fiber core I, a lower plate, a connecting rod, an upper plate, a coating layer II, a sealing sleeve, a cladding layer II, a buffer zone II and a fiber core II, the window is nested in the embedding groove, the inner side of the anti-collision sleeve is attached to the window, the anti-collision sleeve and the elastic band are connected by the connection piece, the elastic sleeve and the elastic band are connected, the rotary rod is arranged at the center of the elastic sleeve, the lower plate is arranged on the outer surface of the coating layer I, one end of the connecting rod is connected with the lower plate, the other end of the connecting rod passes through the upper plate, and is in nested connection with the upper plate, the cladding layers are arranged in the coating layers, the buffer zones are arranged on the outer surface of the cladding layers, and the fiber cores are arranged in the cladding layers. The beneficial effects are that: (1) the light-cone-based forward scatter dust instrument optical system facilitates collection of much scattering measuring light; (2) the light-cone-based forward scatter dust instrument optical system can ensure the accuracy of monitoring, and has high energy transmission efficiency and small losses; and (3) the light-cone-based forward scatter dust instrument optical system has shock and impact resistance.