38results about How to "Low damage threshold" patented technology

A method of depositing various materials onto heat-sensitive targets. Heat-sensitive targets are generally defined as targets that have thermal damage thresholds that are lower than the temperature required to process a deposited material. The invention uses precursor solutions and / or particle or colloidal suspensions, along with optional pre-deposition treatment and / or post-deposition treatment to lower the laser power required to drive the deposit to its final state. The present invention uses Maskless Mesoscale Material Deposition (M3D™) to perform direct deposition of material onto the target in a precise, highly localized fashion. Features with linewidths as small as 4 microns may be deposited, with little or no material waste. A laser is preferably used to heat the material to process it to obtain the desired state, for example by chemical decomposition, sintering, polymerization, and the like. This laser processing may be performed in an ambient environment with laser powers of less than 100 milliwatts.

A method of depositing various materials onto heat-sensitive targets, particularly oxygen-sensitive materials. Heat-sensitive targets are generally defined as targets that have thermal damage thresholds that are lower than the temperature required to process a deposited material. The invention uses precursor solutions and / or particle or colloidal suspensions, along with optional pre-deposition treatment and / or post-deposition treatment to lower the laser power required to drive the deposit to its final state. The present invention uses Maskless Mesoscale Material Deposition (M3D™) to perform direct deposition of material onto the target in a precise, highly localized fashion. Features with linewidths as small as 4 microns may be deposited, with little or no material waste. A laser is preferably used to heat the material to process it to obtain the desired state, for example by chemical decomposition, sintering, polymerization, and the like. This laser processing may be performed in an ambient environment with laser powers of less than 100 milliwatts. Cover gases and / or forming gases may be used during thermal processing to change the material properties, for example by preventing oxidation.

Optical apparatus including a pump-guiding fiber (30) including a fiber cladding (31), a fiber core (32) and an attachment section (33), the attachment section (33) including a straight core section (34) and a tapered core section (35), the pump-guiding fiber (30) being optically attached at one end thereof to a pump source (29) and an opposite end of the pump-guiding fiber (30) being attached to an inner clad (42) of a receiving fiber (40) through an attachment section (50), the attachment section (50) including both the straight core section (34) and the tapered core section (35) of the pump-guiding fiber (30), characterized in that both the straight core section (34) and the tapered core section (35) of the pump-guiding fiber (30) are attached to the receiving fiber (40) with an intermediate sol-gel material (51).

An anti-resonant hollow core optical fiber having multiple resonant layers. The optical fiber comprises a low-refractive index core region (1) and a high-refractive index cladding region. The high-refractive index cladding region comprises an inner cladding region (4) and an outer cladding region (5). The outer cladding region (5) clads the inner cladding region (4) and the core region (1). The inner cladding region (4) comprises a first anti-resonant layer (2) and a second anti-resonant layer (3), and the first anti-resonant layer (2) and the second anti-resonant layer (3) surround the core region (1); and the first anti-resonant layer (2) comprises several layers of microcapillary tubes, and the second anti-resonant layer (3) supports the first anti-resonant layer (2). The optical fiber adopts a double-cladding structure and uses two or more anti-resonant layers such that theoretically simulated loss is reduced to 0.1 dB / km, and has the features of ultralow transmission loss, wide spectral bandwidth, low bending loss, low transmission loss, high damage threshold and single-mode transmission.

The invention discloses a fiber reinforced metallic matrix composite board and a pretreatment method thereof. The composite board is of a multi-layer composite structure, wherein the multi-layer composite structure is obtained by alternatively stacking reinforcing fibers and metallic matrix materials, the reinforcing fibers are carbon fiber cloths or glass fiber cloths with micro mesh woven structures, and the metallic matrix materials are lightweight metal materials with the thickness of 1-3 mm. A femtosecond / picosecond laser welding mode including one of an equal-space spot welding mode, a linear track welding mode and a circular track welding mode or a spiral track welding mode is adopted. According to process parameters, the laser spot beam diameter is 2-100 microns, the laser power is0.1-4 kW, the welding speed is 10-80 mm / min, and the welding current is 50-200 A. By means of the narrow laser spot, nonlinear high absorption rate and high penetration performance of a femtosecond / picosecond laser, bimetallic sheets isolated by the fibers are metallurgically combined through welding at fiber micropores to manufacture the high-strength fiber reinforced metallic matrix composite board.

The present invention discloses a preparation method of a plane lens. The method comprises: employing high refraction index nanofluid materials to dropwise add onto loose and porous monolithic gel body materials with low refraction index and high damage threshold, and allowing the refraction index of the monolithic gel body materials to be gradually changed (diffusing from middle portion to transverse direction and vertical direction or diffusing from an edge layer) after the nanofluid materials are permeated through diffusion of the nanofluid materials in the monolithic gel body materials and through adoption of the nanofluid material physical property and the monolithic gel body material porous structure to prepare a plane lens. The preparation method of the plane lens is simple in process, and can control forming of the refraction index of the lens through selection of the nanofluid materials and the monolithic gel body materials, the formed lens has higher transmittance than a lens based on glass materials, a lens with a continuously and gradually changed refraction index prepared by the method can omit the tedious preparation process of a traditional glass-based lens and does not need processes such as grinding, polishing and the like so as to save the production cost, and is an ideal lens with a continuously and gradually changed refraction index.

The invention discloses a multi-stage taper optical fiber phase conjugation mirror and a device and method for laser double-journey amplification of the multi-stage taper optical fiber phase conjugation mirror. The device for laser double-journey amplification comprises a laser, a first polarizing film, a lambada / 2 wave plate, a Faraday magnetic rotation device, a second polarizing film, a laser amplifier, a lambada / 4 wave plate, a first lens, a second lens and multi-stage taper optical fibers, wherein the laser, the first polarizing film, the lambada / 2 wave plate, the Faraday magnetic rotation device, the second polarizing film, the laser amplifier, the lambada / 4 wave plate, the first lens, the second lens and the multi-stage taper optical fibers are sequentially placed in the optical axis direction. The first lens is a convex lens, the second lens is a concave lens, a telescope system is formed by the first lens and the second lens, the focal length f1 of the first lens ranges from 100mm to 1000mm, and the focal length f2 of the second lens ranges from -20mm to -1000mm; the distance D1 between the first lens and the second lens satisfies the equation that D1=f1+f2, wherein the D1 ranges from 20mm to 1000mm. The multi-stage taper optical fiber phase conjugation mirror is high in damage threshold, low in stimulated brillouin scattering threshold, high in reflectivity and wide in dynamic working range, therefore, the conjugation mirror is applied to a high-power laser, and damage is avoided.

The invention belongs to the field of spatial light field regulation and control, and relates to a spatial light modulator coupling device without zero-order diffracted light. The device comprises a sealing box, an asymmetric triangular reflector and a spatial light modulator. The asymmetric triangular reflector and the spatial light modulator are oppositely arranged and are arranged in the sealing box; a light inlet hole and a light outlet hole are formed in the sealing box; incident light sequentially passes through the light inlet hole, the asymmetric triangular reflector, the spatial lightmodulator and the asymmetric triangular reflector and then is emitted out from the light outlet hole. The zero-order diffracted light-free spatial light modulator coupling device has the advantages of high-precision light field regulation and control, zero-order light beam suppression without a spatial filter, modularization and compactness of the spatial light field regulation and control deviceand easiness in combination with other systems.

The invention relates to the technical field of laser cutting and discloses a laser through cutting device for a transparent hard and brittle material. The laser through cutting device for the transparent hard and brittle material comprises a laser device, a beam expander, a reflector, an extended depth of focus optical device and a focusing mirror. The laser device receives an external pulse signal and forms a pulse envelope. The pulse envelope is subjected to beam expanding through the beam expander, is reflected by the reflector and then sequentially passes through the extended depth of focus optical device and the focusing mirror to form a laser spot. The focusing spot acts on the machined material to form a material modification channel or a material modification channel cluster penetrating through the material in the thickness direction. The laser through cutting device for the transparent hard and brittle material guarantees that the machined material can crack along a preset path, efficient and precise cutting of the machined material is achieved, and the requirements for high efficiency, high quality and a low damage threshold are met.