199results about How to "Increase laser power" patented technology

The invention discloses a method for brazing or fusion-welding through lasers with ultrasonic waves as auxiliaries, which relates to a welding method. The invention solves problems during processes that the lasers are used to braze or fusion-weld coating metals which has low melting points or dissimilar metals, and the problems are that wetting spreading property is bad, filling amount is not enough, stomatas and solders aren't welded fully and the like. The method of the invention is that during the processes that the lasers are used to braze the coating metals which has the low melting points or the lasers are used to fusion-weld the dissimilar metals, simultaneously, the ultrasonic waves with high-frequency vibrations are applied in welding zones which will be coagulated. The invention has the advantages that the occurrences of air holes can be minimized or avoided, and welding cost can be lowered. Welding solders can flow fully due to the high-frequency vibrations, which is beneficial for the wetting spreads of the welding solders and penetrations of the welding solders to the bottom portion of the welding zones, weld pool width and welding filling amount can be increased, the occurrences of welding defects as non-welding fully, undercuts and the like can be avoided, weld formations can be improved, and weld strength can be increased.

The device comprises a device (2) for creating an essentially linear target (4) in an evacuated space where laser beams (1) are focused, the target being suitable for interacting with the focused laser beams (1) to emit a plasma emitting radiation in the extreme ultraviolet. A receiver device (3) receives the target (4) after it has interacted with the focused laser beams (1), and a collector device (110) collects the EUV radiation emitted by the target (4). The focusing elements (11) for focusing the laser beams on the target (4) are arranged in such a manner that the laser beams (1) are focused on the target (4) laterally, being situated in a common half-space relative to the target (4) and being inclined at a determined angle lying in the range about 60° to about 90° relative to a mean collection axis (6) perpendicular to the target (4). The collector device (110) is disposed symmetrically about the mean collection axis (6) in the half-space containing the laser beams (1) focused on the target (4) and inside a conical space (8) centered on the mean collection axis (6) with a vertex situated at the target (4) and a half-angle at the vertex that is less than the angle of inclination of the focused laser beams (1) relative to the mean collection axis (6). The device is suitable for use as a source for EUV radiation in lithography for fabricating integrated circuits.

A thorium-free low absorption coating for infrared CO2 laser optics comprises an interior BaF2 layer formed on a substrate and an exterior layer formed over the interior layer to a predetermined thickness sufficient to substantially prevent water adsorption by the interior layer. Generally, the predetermined thickness is greater than about 11000 ANGSTROM , and in one embodiment of a two-layer low absorption coating designed for antireflection at 10.6 microns, the exterior layer has a physical thickness in a range between about 24600 ANGSTROM and 22800 ANGSTROM , and preferably about 24000 ANGSTROM . In the preferred two-layer AR coating embodiment, the exterior layer defines a cover layer and an absentee layer, and the interior layer is relatively thin. The preferred exterior layer and the preferred substrate consist essentially of ZnSe. Multilayer stacked coatings of more than two layer can also be formed to provide low absorption partially reflective or totally reflective coatings as well as AR coatings.

The invention relates to a laser-electric arc composite heat source high-speed welding method of ultrahigh strength steel, belonging to the technical field of high-strength steel welding. The traditional laser-electric arc composite heat source high-speed welding method of the high-strength or ultrahigh strength steel has overhigh welding linear energy due to low welding speed and large energy input so as to cause the deformation of a welding workpiece; in addition, chevilled silk spacing is overlarge, and stabilization action realized by a laser is reduced because the laser is adopted firstly and the electric arc is adopted subsequently so that a welding process is unstable and easy to generate splashing. The invention adopts laser-electric arc composite heat source welding; the welding workpiece is the high-strength steel or the ultrahigh strength steel; an electric arc welding gun is used for welding firstly and a laser nozzle is used for welding subsequently during welding; the current of electric arc welding is 140-180A, and the voltage of the electric arc welding is 23-25V; an included angle theta between the electric arc welding gun and the surface of the workpiece is 60-65 degrees; the laser power is 3-5kW; the welding speed v is 1-3m/minute; and the chevilled silk spacing h between a laser beam and a welding stick is determined within a range of 1-3mm. The invention realizes the welding of the ultrahigh strength steel without preheating, cold cracks or deformation.

The invention discloses an optical fiber with a ring-shaped doped layer, which is used in an optical fiber laser and composed of an inner clad layer (101), a ring-shaped doped layer (102), a middle clad layer (103), an outer clad layer (104) and a protective layer (105), wherein the ring doped layer (102), the middle clad layer (103), the outer clad layer (104) and the protective layer (105) are, from inside to outside, sequentially clad on the inner clad layer (101), and the inner clad layer (101) is an undoped optical fire core. The invention also discloses a method for preparing the optical fiber with a ring-shaped doped layer, and a laser taking the optical fiber with a ring-shaped doped layer as a gain medium. According to the invention, the traditional fiber core doping is changed into a ring-shaped doped layer, so that the laser oscillation is actually performed in a ring-shaped waveguide, and then through reasonably designing the thickness of the ring-shaped waveguide, a single-mode operation can be kept; meanwhile, because the cross section area of the doped layer is large, the optical fiber with a ring-shaped doped layer is suitable to high-power output, therefore, the output power of the optical fiber laser using the optical fiber can be improved.

The invention provides a preparation method for tellurate glass compound optical fibers. According to the preparation method, an outer coating layer is made of phosphoaluminate glass or lead silicate glass; core fiber glass and inner coating layer glass are made of tellurate glass; the core fiber glass is drawn into a thin rod and is inserted into a glass sleeve prepared from the inner coating layer glass; a core rod with the coating layer glass is drawn on a wire drawing machine; the prepared core rod is inserted into an outer coating layer glass sleeve prepared from the phosphoaluminate glass or the lead silicate glass to be drawn into the multi-coating-layer tellurate glass compound optical fibers. The preparation method has the advantages that the tellurate glass compound optical fibers with high mechanical strength can be prepared and the disadvantages of traditional tellurate glass optical fibers that the fragility is great, and the traditional tellurate glass optical fibers are easy to crack and are not easy to operate are overcome; meanwhile, the good middle infrared transmission capability of the tellurate glass is remained.

The invention discloses a laser-cladding tungsten carbide ceramic particle reinforced metal-based coating. The coating comprises alloy powder; the alloy powder comprises tungsten powder and graphite with the mole ratio of 2:1 and further comprises reduced iron powder, chromium powder, nickel powder, boron powder, silicon powder and copper powder; further, the alloy powder preferentially comprises the following components in percentage by mass: 55-60% of tungsten powder, 7-9% of graphite, 23-30% of reduced iron powder, 0-3% of chromium powder, 2-6% of nickel powder, 0.3-1% of boron powder and 0.4-1% of silicon powder. The invention further discloses a processing method for the laser-cladding tungsten carbide ceramic particle reinforced metal-based coating. According to the invention, a tungsten carbide particle reinforcing phase for reinforcing the iron-based composite is successfully prepared through a laser cladding in-situ synthesis technology, and a transition layer is arranged between the coating and the matrix, so that atom binding between the coating and the matrix is realized and the bonding strength is relatively high.

A reading devices suppresses deterioration of the recording marks caused by increasing the output laser power to compensate for a drop in the S/N ratio when reading at a high speed information recorded to a high density recording medium. To read information recorded to an optical data recording medium that is written and read using a laser beam output from a semiconductor laser, the reading method modulates a high frequency current on the drive current of the semiconductor laser to output the laser beam, and changes the light modulation rate according to the selected linear velocity used for reading. The light modulation rate is the ratio Pp/Pave between the peak power Pp and the average read power Pave of the light intensity of the high frequency modulated laser beam.

The embodiment of the invention discloses a laser radar and a laser radar control method. The laser radar comprises two or more than two detection units, each detection unit comprises: one emitter configured to emit an emergent laser; one emitting terminal collimation unit configured to perform collimation of the emergent laser emitted by the emitter; one polarizing beam-splitting unit configuredto allow the emergent laser after collimation to enter from a first light port of the polarizing beam-splitting unit to allow the P polarized light in the emergent laser after collimation to be emergent from the emitting terminal collimation unit; a quarter-wave plate configured to allow the P polarized light emergent from the second light port of the emitting terminal collimation unit to become circular polarized light; and a galvanometric scanner configured to change the emergent direction of the circular polarized light to become the emergent laser. The laser radar and the laser radar control method can enhance the scanning range of the laser radar and improve the resolution and precision of the laser radar.

The reproduction durability of an optical recording medium is evaluated highly accurately in a short period of time by providing a method for evaluating the optical recording medium, the method including determining an operating laser power for heating a recording layer to a recording operating temperature; determining a temperature of the recording layer when a laser beam having a predetermined reproducing laser power is radiated during a data reproduction; determining a relationship between the reproducing laser power during the data reproduction and a reproduction durability times at the reproducing laser power; and determining a relationship between the temperature of the recording layer during the data reproduction and the reproduction durability times from the relationship between the reproducing laser power during the data reproduction and the reproduction durability times.

The invention discloses a three-dimensional high-definition mammary gland imager in the biological medical imaging domain, which is characterized by the following: judging pathologic position and degree of mammary gland tissue according to optical parameter according to grey, tissue structure and size semi-quantitatively or qualitatively; adopting infrared (600-900nm) as light source; modulating space of irradiated light through coded aperture without harmful detecting; forming digital infrared optical scanning hologram; utilizing digital decoded technique to extract the information of galactophore tissue; displaying three-dimensional high-definition image.

The invention provides a central part reconstruction method and a device of an unstable resonator laser annular beam. The method comprises: an annular beam output by an unstable resonator laser is guided by an inner round table surface annular reflecting mirror and is gradually concentrated towards the optical axis position of the laser; the light beam concentrated on the periphery of the optical axis is reguided by utilizing an external cone surface reflecting mirror to obtain a reshaped light beam output along the optical axis direction; and the relative position of the inner round table surface annular reflecting mirror and the external cone surface reflecting mirror along the optical axis direction is precisely adjusted to realize the circular solid reshaping light beam output along the optical axis direction. The device comprises the unstable resonator laser, the inner round table surface annular reflecting mirror, the external cone surface reflecting mirror, a precise displacement mechanism of the inner round table surface annular reflecting mirror and a precise displacement mechanism of the external cone surface reflecting mirror. Compared with the prior art, the method can utilize an extracavity optical element to change the annular beam output by the unstable resonator laser and obtain circular solid light beam output. The provided device has simple structure and stable operation.

A method for utilizing polarization as a scheme for fluorescence removal from UV Raman spectra collected in a standoff detection scheme has been invented. In this scheme, a linearly polarized ultraviolet (UV) laser interacts with a material on a surface or in a container. The material generates Raman scattering with polarization contributions relative to that of the laser. The material possibly fluoresces as well, but the fluorescence is generally unpolarized. By subtracting a scaled version of the perpendicular component from the parallel component of the returned signal both relative to the laser source polarization—it is possible to generate a spectrum that is fluorescence free and contains the strongest features of the Raman scattered light.

The invention relates to the field of the optics and laser, in particular to a structure of optics or laser crystal. The crystal device comprises a crystal, a first window diaphragm and a second window diaphragm, wherein, the first window diaphragm is glued with an incident optical surface of the crystal; and the second window diaphragm is glued with an emergent optical surface. The first window diaphragm or the second window diaphragm is plated by a dielectric film. The side surfaces of the contact surfaces among the crystal, the first window diaphragm and the second window diaphragm are adhered by UV adhesive; the non-light through an upper bottom surface and a non-light through lower bottom surface of the crystal are respectively provided with a protection plate, and the protection plates are adhered with the crystal by the UV adhesive. The refractive indexes of the first window diaphragm and the second window diaphragm are identical or similar to the refractive index of the crystal. Due to the technical proposal, the invention can prevent the film damage from influencing the performances of the laser, or prevent the deliquescence of the crystal or prevent the direct plating on the surface of the optical crystal from causing the film damage or shedding and the like, thereby improving the damage threshold and the laser power of the laser and broadening the application range of certain crystals.

An optical device for characterizing a test surface combines a Fizeau interferometer with a polarization frequency-shifting element. Two substantially collinear, orthogonally polarized beams having respective frequencies differing by a predetermined frequency shift are generated by the polarization frequency-shifting element and projected into the Fizeau optical cavity to produce a pair of test beams and a pair of reference beams, wherein the beams in each pair have orthogonal polarization states and have frequencies differing by the predetermined frequency shift. A second, substantially equal frequency shift is introduced in the Fizeau cavity on either one of the pairs of test and reference beams, thereby generating a four-beam collinear output that produces an interferogram without tilt or short-coherence light. The invention may also be implemented by reversing the order of the Fizeau cavity and the polarization frequency-shifting element in the optical train.

An atomic force microscope includes a tip mounted on a micromachined cantilever. As the tip scans a surface to be investigated, interatomic forces between the tip and the surface induce displacement of the tip. A laser beam is transmitted to and reflected from the cantilever for measuring the cantilever orientation. In a preferred embodiment the laser beam has an elliptical shape. The reflected laser beam is detected with a position-sensitive detector, preferably a bicell. The output of the bicell is provided to a computer for processing of the data for providing a topographical image of the surface with atomic resolution.

An active-illumination parallel Raman microspectroscopy scheme for simultaneously collecting Raman spectra from multiple points in a full-spectra range. A combination of multi-point laser illumination with wide-field Raman imaging is employed in order to allow for simultaneous imaging of multiple points not aligned on a single line.

An optical disc recording/reproducing apparatus includes: recording/reproducing means for recording/reproducing information by emitting a light beam onto a disc having a track which wobbles at a predetermined frequency; reflected light detection means for detecting the light beam reflected from the disc; wobble signal detection means for detecting a wobble amplitude signal which represents an amplitude of a signal generated from a component which is extracted from an output of the reflected light detection means and which wobbles at the predetermined frequency; and variation rate detection means for detecting dirt adhered on the disc based on a rate of a variation in the wobble amplitude signal, wherein the variation rate detection means detects the dirt based on the wobble amplitude signal before the recording/reproducing means records/reproduces the information.

The invention provides a light beam shaping system for metal SLM printing. The system comprises a laser, and a collimator, a zoom beam expander, a beam shaping mechanism, a galvanometer system and a working platform which are sequentially arranged in the propagation direction of laser beams emitted by the laser. A laser beam emitted by the laser is transmitted through an optical fiber to the collimator with an optical fiber interface for collimation, and the spot size is adjusted through the zoom beam expander to meet the incident spot size requirement of the beam shaping mechanism, the incident spots are shaped through a beam homogenizer or a beam shaper and then converted into flat-topped spots, the flat-topped spots are focused through the galvanometer system to form gathered spots, andthen the gathered spots reach the working surface to machine the metal powder. According to the system, light beam energy is redistributed to obtain circular, rectangular and oval flat-topped light spots or flat-topped light spots of specific shapes are customized according to requirements, metal printing defects can be effectively reduced through shaping of the system, and meanwhile, efficient printing can be conducted by introducing a high-power laser system in cooperation with large-size light spots.

The invention comprises: a transmitting end, a receiving end and an optical lens group. Said transmitting end and receiving end are set in parallel. Said optical lens group comprises a first fully-reflecting glass-slide and a second fully-reflecting glass-slide; said first fully-reflecting glass-slide and second fully-reflecting glass-slide are set in parallel for use in guiding the incident light to said receiving end.

The invention discloses a high-speed and high-linearity silicon-lithium niobate external cavity frequency modulation laser. A reflective semiconductor optical amplifier of the external cavity laser isconnected to a phase shifter through a silicon-based light spot size converter; and then the output end of the phase shifter is connected with the input end of the first micro-ring filter, the outputend of the first micro-ring filter is connected with the input end of the second micro-ring filter, and the output end of the second micro-ring filter is connected with the input end of the reflector. And a lithium niobate film is bonded above the silicon waveguide. According to the invention, a filtering structure is formed through vernier effects of the two micro-ring filters, and laser with awide tuning range and a narrow line width can be obtained. By utilizing the advantages of low loss, strong linear electro-optic effect and high modulation speed of the lithium niobate film, the line width of the laser can be further compressed, the output laser power is improved, and high-speed linear frequency modulation is realized.