36 results about "Laser nd-yag" patented technology

The invention provides a method and apparatus for guiding a weapon to a target using an optical seeker having dual semi-active laser (SAL) and laser radar (LADAR) modes of operation. The dual mode seeker incorporates a laser light source, an optical package including a quadrant detector for operating in SAL mode and a LADAR receiver for operating in LADAR mode. The seeker further includes a high speed scanning mirror for switching between modes to guide the weapon to the target. The method for guiding a weapon to a target includes receiving radiation from the target and tracking the radiation to guide the weapon; monitoring the detected radiation such that if the radiation falls below a predetermined level, a laser system on-board the weapon continues guiding the weapon by generating a laser beam; reflecting the laser beam off the target so that the reflected laser radiation is received from the target to track the radiation and guide the weapon to the target.

There are provided high power laser and laser mechanical earth removing equipment, and operations using laser cutting tools having stand off distances. These equipment provide high power laser beams, greater than 1 kW to cut and volumetrically remove targeted materials and to remove laser affected material with gravity assistance, mechanical cutters, fluid jets, scrapers and wheels. There is also provided a method of using this equipment in mining, road resurfacing and other earth removing or working activities.

The invention is for a sensor for use in spacecraft navigation and communication. The system has two articulated telescopes providing navigation information and orientation information as well providing communications capability. Each telescope contains a laser and compatible sensor for optical communications and ranging, and an imaging chip for imaging the star field and planets. The three optical functions share a common optical path. A frequency selective prism or mirror directs incoming laser light to the communications and ranging sensor. The Doppler shift or time-of-flight of laser light reflected from the target can be measured. The sensor can use the range and range rate measured from the incoming laser along with measurements from the imaging chip to determine the location and velocity of the spacecraft. The laser and laser receiver provide communications capability.

Hot cracking in laser welds produced in metal workpieces, especially aluminum or magnesium sheet alloys, is avoided by suitably combining the beams of two different lasers, for example a CO₂ laser and a YAG laser, into a compound beam that is moved along a weld path in the surface of the workpiece. The power level of at least one of the lasers is cyclically varied so that weld nugget segments of different alternating, hot crack free, configurations are produced in a linear weld.

A small size and high efficiency laser oscillation apparatus capable of obtaining high output and high beam quality laser light is provided. First waveguide (21) (refractive index=n1) for transmitting excitation light, second waveguide (22) composed of core (23) (refractive index=n3) for generating laser light and clad (24) (refractive index=n2) for transmitting the excitation light, and third waveguide (25) (refractive index=n4) including first waveguide 21 and second waveguide 22 are provided. Light amplifying fiber (20), in which the refractive indices are set so as to satisfy the relation: n1<n4<n2<n3, is used and excised by semiconductor lasers (10a) and (10b).

The invention relates to a coal-rock recognition device based on cutting of a drum shearer. The coal-rock recognition device comprises a protective sleeve, a mounting bracket, a water sprayer, an ultrasonic transducer, a laser transmitter and a laser receiver; the mounting bracket is mounted in the protective sleeve; the protective sleeve is mounted on a shell of a rocker arm; and the water sprayer, the ultrasonic transducer, the laser transmitter and the laser receiver are all mounted on the mounting bracket. The coal-rock recognition device has the beneficial effects that a water flow sprayed by the water sprayer can serve as a coupling medium through the effect of ultrasonic wave receiving and transmitting of the ultrasonic transducer, a coal-rock interface is recognized according to the backward wave characteristic, and the coal-rock interface can be recognized according to the laser characteristic through laser transmitting of the laser transmitter and laser receiving of the laser receiver so that the coal-rock interface recognized through the backward wave characteristic and the coal-rock interface recognized through the laser characteristic can be compared, the recognition ability of the drum shearer over the coal-rock interface is improved, and thus cutting operation of the drum shearer is facilitated.

The invention provides a laser direct imaging optical system, which comprises: laser light source lighting equipment; digital micro-mirror device equipment arranged above the laser light source lighting equipment; a photoetching imaging lens arranged below the digital micro-mirror device equipment, wherein the photoetching imaging lens comprises a beam splitter prism, and the beam splitter prism can split laser into P laser and S laser; and laser energy tracking equioment, wherein the laser energy tracking equipment is arranged to face the photoetching imaging lens, receives the S laser, tracks the energy of the S laser and generates an adjusting signal based on the tracked energy of the S laser, and the laser light source lighting equipment performs adjustment based on the adjusting signal. According to the laser direct imaging optical system, the energy change of the laser can be automatically tracked and adjusted in time, and the stability of the laser energy is improved.

A microscope illumination apparatus includes an optical conversion unit that converts laser light incident thereon from a light source to laser light that has an NA and whose main optical axis is distributed on a conical surface that widens at a predetermined angle with respect to an incident optical axis of the laser light, and from which the laser light exits, and an optical device that has no refractive power and that deflects the laser light, which has exited the optical conversion unit, in a direction parallel to the incident optical axis, wherein the microscope illumination apparatus focuses laser light that has exited the optical device at a pupil position of a focusing lens for illuminating a specimen or a position that is conjugate with the position.

The invention discloses a Q-switched holmium laser. The Q-switched holmium laser comprises a composite resonant cavity, a Tm/Ho composite gain medium, a Q-switched element and a pumping source; the composite resonant cavity comprises a laser resonant cavity and a filtering resonant cavity; the filtering resonant cavity and the Q-switched element are sequentially positioned in the laser resonant cavity along the light path direction; the Tm/Ho composite gain medium is located in the filtering resonant cavity; the pumping source is positioned outside the laser resonant cavity; wherein the filtering resonant cavity is used for separating Tm laser from Ho laser. The laser comprises a composite resonant cavity, the composite resonant cavity realizes separation of Tm laser and Ho laser, and theTm laser is confined in a filtering resonant cavity, so a Q-switched element only influences the Ho laser, and the Tm laser can effectively excite the Ho laser to form stable Q-switched pulse output.

The invention relates to a method for determining a closed trajectory curve (10) by a laser (12) and a laser light sensor (14) having a flat field of view (16), which includes the steps A to G, as well as an apparatus (36) for determining a closed trajectory curve (10).

The invention discloses a tempered glass flatness online detection system and a detection method thereof. The system comprises a lamp box used for radiography, a camera used for collecting the morphology of to-be-measured tempered glass, a high-speed computer used for analysis and calculation and a real-time track speed measuring device used for measuring the speed of a tempered glass conveying roller way, wherein the real-time track speed measuring device is in signal connection with the high-speed computer, the camera is in signal connection with the high-speed computer, and a plurality of rows of circular holes are formed in the bottom of the lamp box. Compared with an eagle system, the tempered glass flatness online detection system of the invention has the advantages that the offset of the midpoint position of each light spot is directly measured, the signal is large, the measurement precision is high, the error is low, the number of the light spots is increased due to simple measurement parameters, and the camera adopts a continuous high-speed sampling mode, so that more dense measurement information can be obtained, and the measurement accuracy is improved; and compared withan ilook system, the tempered glass flatness online detection system of the invention has the advantages that the lamp box and the camera are used for replacing laser and a laser receiver, so that the cost is low, and debugging is convenient.

The invention relates to a high-frequency double-color coherent anti-Stokes Raman spectrum temperature measurement device and method, and the device comprises a high-frequency laser which is used forgenerating 1064nm laser with the repetition frequency of 100kHz and outputting 355nm laser and 532nm laser after the 1064nm laser is subjected to triple frequency and double frequency, wherein the 532nm laser serves as pump light/probe light; a seed laser module which is used for generating two seed lasers near 855nm; an optical parametric oscillator which is used for converting the 355nm laser input by the high-frequency laser and the 855nm laser input by the seed laser to generate 607nm laser as Stokes light; a coherent anti-Stokes Raman signal generation module which is used for mixing 532nm pump light and Stokes laser near 607nm at a detection gas molecule through a lens to generate a coherent anti-Stokes Raman signal; and an imaging spectrometer which is used for imaging the input coherent anti-Stokes Raman signal and calculating the spectral data of the image to obtain the temperature of the detection gas.

The invention discloses a wafer double-power cutting method. The method comprises the steps that 1, laser A is emitted through a double-port laser; 2, the laser A passes through two different laser power converters, and the laser A is converted into laser B and laser C which are different in power; step 3, the laser B and the laser C respectively pass through two optical gate devices, and the two optical gate devices are both used for releasing and closing the laser; 4, the laser B and the laser C are subjected to beam expanding through two beam expanding devices; step 5, turning the laser B and the laser C after beam expansion through a turning optical cavity assembly; step 6, converging the steered laser B and laser C together through a light path converging light cavity assembly; 7, the converged laser B and laser C are emitted at the same position through a light emitting cavity assembly; according to the invention, after the laser is split, the opening and closing of the two light paths are regulated and controlled, the emergent light with different powers can be provided as required, and the implicit cutting requirements of wafers are met.

The invention discloses a laser drilling ash removal process for HDI circuit board production, and aims to solve the problems that in the prior art, the surface of a circuit board is prone to being contaminated by dust, black carbonized residues are left on hole walls, the carbonized residues in the hole walls are difficult to clean, and the production efficiency is high. And carbonized residues and dust influence the normal use of the circuit board. The laser drilling ash removal process comprises the following steps: step 1, etching a copper foil window; 2, cleaning dust and impurities on the surface of the circuit board; 3, the circuit board is moved to a film pasting machine, and film pasting operation is completed; and 4, burning off the substrate material in the window by using laser to form the blind hole. According to the laser drilling ash removal process, by means of the design that the dry film is attached to the surface of the circuit board, cleanliness of the circuit board is guaranteed, meanwhile, drilling operation is conducted in the mode that CO2 laser and YAG laser are combined, the inner wall of a hole formed through the YAG laser is clean and free of carbonization, cleanliness of the surface of the circuit board and the interior of the hole wall is guaranteed, and normal use of the circuit board is guaranteed.