575results about "Laser constructional details" patented technology

The present invention provides a laser irradiation apparatus, a laser irradiation method and an insulating film forming apparatus, wherein a resist pattern is formed with high quality. The laser irradiating apparatus of the invention is provided with the following components: a laser source which sends out pulse laser beam; an object table which holds a substrate; a coating device which coats resist material on the substrate that is held on the object table; a first transmission optical system which focuses the pulse laser beam that is transmitted from the laser source on the resist material that is coated through the coating device for transmission and solidifying the resist material on the transmission position; a second transmission optical system which transmits the pulse laser beam that is sent out from the laser source to the resist material that is solidified by the pulse laser beam that is transmitted through the first transmission optical system and removes the resist material at a transmission position; and an optical path switching device which causes the pulse laser beam that is sent out from the laser source to selectively transmit to the first transmission optical system or the second transmission optical system.

A laser beam machining apparatus includes a laser oscillator, a machining head which that machines a workpiece using the laser beam. An optical duct has an optical system to guide the laser beam form the laser oscillator to the machining head. Purge gas is supplied into the optical duct from a purge gas supply port, and the purge gas is output from a purge gas exhaust port. A detector detects presence of undesired gas in the optical duct.

An optical adjusting mount capable of movably processing all-solid-state high power lasers comprises a frame, a support and a fine adjustment screw pair, wherein a lens hole of the frame is internally equipped with a baffle ring, a retainer ring is disposed on the front of the baffle ring, four tension spring holes are positioned on the frame, the back face of the frame is equipped with a V-type groove, a concave groove and a ball tapered-groove, the side face of the frame is equipped with a cooling water inlet and an outlet, the support is equipped with four tension spring holes, two holes for the fine adjustment screw pair and a ball tapered-groove which correspond to the frame, the frame and the support are connected through tension springs, each of the ball tapered-grooves of the frame and the support are inlaid with a ball, the fine adjustment screw pair is respectively mounted in the two holes for the fine adjustment screw pair of the support, the front ends of the fine adjustment screw pair are respectively located in the V-type groove and the groove. The optical adjusting mount has the advantages of scientific reasonable design, compact structure, low material consumption and low cost, further utilizes the baffle ring made of low-hardness fine heat conductivity red copper to press the lens on the end face, thereby effectively reducing the lens temperature, and utilizes the V-type groove and the ball for positioning, thereby realizing stable and reliable groove limiting.

An optical device may include a substrate, a metal layer on the substrate, at least one first nano-structure in the layer, and at least one second nano-structure in the layer. The at least one first nano-structure may include a light source. The at least one first and second nano-structures may be spaced apart. A method of controlling a propagation direction of light output from an optical device that includes a metal layer on a substrate may include disposing first and second nano-structures in the layer; disposing at least one light source in the first nano-structure; and controlling the propagation direction of the light output from the at least one light source by changing at least one of a shape of the first nano-structure, a shape of the second nano-structure, a size of the first nano-structure, a size of the second nano-structure, and an interval between the first and second nano-structures.

A device for generating a laser light beam includes a module. The module includes at least one laser light source, and a mechanical, an electrical and/or an optical interface defined towards an outside of the module.

A laser system for semiconductor inspection includes a fiber-based fundamental light source for generating fundamental light that is then converted/mixed by a frequency conversion module to generate UV-DUV laser light. The fundamental light source includes a nonlinear chirp element (e.g., a Bragg grating or an electro-optic modulator) that adds a nonlinear chirp to the seed light laser system prior to amplification by the fiber amplifier(s) (e.g., doped fiber or Raman amplifiers). The nonlinear chirp includes an x² or higher nonlinearity and is configured to compensate for the Self Phase Modulation (SPM) characteristics of the fiber-based amplifiers such that fundamental light is generated that has a spectral E95 bandwidth within five times that of the seed light. When multiple series-connected amplifiers are used, either a single nonlinear chirp element is provided before the amplifier string, or chirp elements are included before each amplifier.

The invention discloses a packaging structure of a distributed feedback fiber laser. The packaging structure is characterized by comprising a quartz U-shaped groove and silicone grease or silicone oil with which the quartz U-shaped groove is filled, an active phase shift fiber bragg grating is immersed in the silicone grease or silicone oil in the quartz U-shaped groove, tail fibers at the two ends of the active phase shift fiber bragg grating are fixedly bonded to the quartz U-shaped groove through two pieces of parallel thermocuring glue respectively to enable the active phase shift fiber bragg grating to be kept in the free state under the condition that axial stress is not borne, the grating tail fibers located outside the quartz U-shaped groove are sleeved with plastic sleeves respectively, the two ends of the quartz U-shaped groove and the plastic sleeves on the two sides are jointly inserted into corresponding hot melting pipes respectively, the two hot melting pipes and the quartz U-shaped groove are integrally inserted into a heat shrink pipe, the two hot melting pipes and the heat shrink pipe are heated to be shrunk to enable the two plastic sleeves and the quartz U-shaped groove to be connected into a whole, and meanwhile the heat shrink pipe is shrunk to enable the silicone grease or silicone oil to be sealed in the quartz U-shaped groove.

The invention provides a bias circuit of an electroabsorption modulated circuit. The bias circuit comprises a light emitting assembly TOSA (Transmitter Optical Sub Assembly), a conversion charge pump with nonadjustable output voltage or a switch tube chip, an operation amplifier, and a feedback resistor, wherein the light emitting assembly TOSA is composed of an electroabsorption modulator EA, a semiconductor laser LD and a monitor diode PD, which have a common grounded cathode; the anode of the semiconductor laser LD is connected with a power supply Vcc through a first current limiting resistor; the conversion charge pump or the switch tube chip has a positive power pin connected with the power supply Vcc, a grounded negative power pin, and an output pin connected with one end of a first inductor; the other end of the inductor is connected with the anode of the monitor diode PD and with one end of a third filter capacitor; the other end of the capacitor is grounded; the operation amplifier has a positive power pin connected with the power supply Vcc, a negative power pin connected with the anode of the monitor diode PD, a grounded positive input pin, a negative input pin connected with an external bias unit through a loop resistor, and an output pin connected with the anode of the electroabsorption modulator EA; and the feedback resistor is connected between the negative input pin and the output pin of the operation amplifier.

The invention discloses a device of generating high-speed picosecond narrow pulse laser. A control module is electrically connected with a signal driving module, a constant current compensation module and a temperature control module respectively; the signal driving module, the constant current compensation module and the temperature control module are electrically connected with a laser tube; the control module converts an input triggering signal into a radio frequency driving signal by the signal driving module, and outputs the radio frequency driving signal to the laser tube to drive a laser device to work at a constant temperature to output laser; the control module controls the working temperature of the laser tube by the temperature control module to allow the laser device to work at a constant temperature; and the control module controls the magnitude of compensation current by the constant current compensation module to allow the laser device to output at constant current. The invention further discloses a method of generating the high-speed picosecond narrow pulse laser. The device is stable in output, can be suitable for a quantum key distribution system with quantum light and synchronous light multiplexing an optical fiber, and has the characteristics of concision, convenience and low cost.

The invention relates to a laser apparatus as construction laser apparatus (10) comprising a light source accommodated inside a housing (12). For providing an increased protection of the apparatus and for adjusting the housing and thus the laser plane to the desired extent with constructive simple measurements, it is suggested that the housing (12) is enclosed by a receiving means (14), along which said housing (12) of the laser is arranged in adjustable manner.

Differentially expressed Leishmania genes and proteins are described. One differentially expressed gene (A2) is expressed at significantly elevated levels (more than about 10 fold higher) in the amastigote stage of the life cycle when the Leishmania organism is present in macrophages than in the free promastigote stage. The A2 gene encodes a 22 kD protein (A2 protein) that is recognized by kala-azar convalescent serum and has amino acid sequence homology with an S-antigen of Plasmodium falcilparum Vietnamese isolate VI. Differentially expressed Leishmania genes and proteins have utility as vaccines, diagnostic reagents, as tools for the generation of immunological reagents and the generation of attenuated variants of Leishmania.

Devices and methods for maintaining the brightness of laser emitter bar outputs having multiple emitters for coupling and other applications. In some embodiments, at least one brightness enhancement optic may be used in combination with a beam reformatting optic.

The invention relates to a laser diode pumped solid laser, in particular to a method for modularizing crystal and heat sink in laser diode pumped solid laser. The method is characterized in that the crystal and the crystal heat sink are welded into a whole at high temperature; the crystal heat sink comprises an upper crystal heat sink component and a lower crystal heat sink component; the crystal, the upper crystal heat sink component and the lower crystal heat sink component are assembled together, are closely pressed together by two large parallel free copper, are put into a vacuum furnace together, and then are heated until a silver layer is melted; the crystal, the upper crystal heat sink component and the lower crystal heat sink component are welded together to form a whole; and the welded crystal and the crystal heat sink are plated integrally to obtain an integral element which can be directly used. The method improves the heat conduction efficiency of the crystal side wall, reduces the influence of heat effect, improves the system reliability and the environmental adaptability, and is convenient for batch production of products.

The invention relates to a frequency modulation and noise reduction device for a distributed feedback fiber laser. The frequency modulation and noise reduction device comprises a semiconductor laser, a first wavelength division multiplexer, a first optical isolator, an active phase-shifted grating, a second optical isolator, a second wavelength division multiplexer, a polarization controller, a measuring feedback part and a control part, wherein the 980 end of the first wavelength division multiplexer is connected with the output end of the semiconductor laser; the input end of the first optical isolator is connected with the 1550 end of the first wavelength division multiplexer; one end of the phase-shifted grating is connected with the coupled end of the wavelength division multiplexer; the input end of the second optical isolator is connected with the other end of the active phase-shifted grating; the coupled end of the second wavelength division multiplexer is connected with the output end of the second optical isolator; one end of the polarization controller is connected with the 1550 end of the second wavelength division multiplexer; the measuring feedback part is connected with the other end of the polarization controller; and the input end of the control part is connected with the output end of the measuring feedback part. The device is used to realize frequency modulation and noise reduction for the DFB optical fiber laser.

The invention discloses an encapsulating structure of a distributed feedback (DFB) fiber laser. The encapsulating structure comprises a rectangular base, an outer encapsulating layer, a sound insulating board, an inner encapsulating layer and strip-shaped piezoelectric ceramic, wherein the outer encapsulating layer is an inwardly-concave rectangle and is buckled on the base so as to form an accommodating space between the base and the outer encapsulating layer; two opposite side walls of the outer encapsulating layer are concentrically provided with two first circular holes; the sound insulating board is attached to an inner wall between the base and the outer encapsulating layer and provided with two second circular holes corresponding to the two circular holes on the outer encapsulating layer; the inner encapsulating layer is a hollow rectangular shell fixed on the sound insulating board on the base and provided with two third circular holes corresponding to the two circular holes on the sound insulating board; the strip-shaped piezoelectric ceramic is fixed on the bottom surface of the inner encapsulating layer on the sound insulating board on the base; the DFB fiber laser is fixed on the upper two sides of the strip-shaped piezoelectric ceramic by bonding; and the two ends of the DFB fiber laser pass through the first, second and third circular holes.

High-speed measurements of the output power level of a laser are obtained by using a high-speed laser output power monitoring device that is capable of producing an electrical feedback signal having an amplitude that varies as the output power level of the laser varies. A high-speed amplitude detector receives the electrical feedback signal and detects the amplitude of the feedback signal and produces an optical modulation amplitude (OMA) detection signal. The OMA detection signal is received in a high-speed amplitude measurement device that measures the OMA and produces an OMA measurement value. The OMA measurement value is then processed by the laser controller to obtain a modulation current control signal, which is then output to the laser driver to cause the laser driver to adjust the laser modulation current to obtain a desired or optimum laser output power level. An average amplitude measurement value may also be obtained using an average amplitude measurement device that processes the OMA detection signal produced by the high-speed amplitude detector to obtain the average amplitude measurement value. The laser controller receives the average amplitude measurement value and processes it to obtain a bias current control signal, which is then output to the laser driver to cause it to adjust the amplitude of the bias current to obtain a desired or optimum average laser output power level.