754 results about "Laser pumping" patented technology

An apparatus and method applicable for generating ultraviolet laser light having a wavelength in the 200-nm range and/or 250-nm range; in some embodiments, using a single fiber laser pump source (in some embodiments, a pulsed source). In some embodiments, the invention provides methods of generating 250-nm or 200-nm photons using a mode-locked 1000-nm fiber laser and efficient 4th/5th harmonic frequency up-conversion. In other embodiments, the invention uses continuous wave (cw) single-frequency fiber lasers and external resonant frequency conversion. In still other embodiments, the invention uses cw single-frequency optically-pumped semiconductor lasers (OPSLs) and electrically driven vertical-cavity surface-emitting lasers (VCSELs) and externally resonant frequency conversion. All of these produce both of the ultraviolet wavelengths of interest.

A passive, coexisting 10 Gb/s passive optical network (XGPON) and Gb/s passive optical network (GPON) is created by using a pair of counter-propagating laser pump sources at a network-based optical line terminal, in combination with a feeder fiber, to create distributed Raman amplification for the upstream signals associated with both GPON and XGPON systems. A passive remote node is located at the opposite end of the feeder fiber, in the vicinity of a group of end-user locations, and includes a cyclic WDM and a pair of power splitters for the GPON and XGPON signals such that the GPON signals are thereafter directed through a first power splitter into optical network units (ONUs) specifically configured for GPON wavelengths and XGPON signals are directed through a second power splitter into ONUs configured for the XGPON wavelengths. The arrangement of the remote node allows for the reach and split ratios of the GPON and XGPON systems to be individually designed for optimum performance.

The invention relates to a passive mode-locking ultrashort pulse all-fiber laser with a waveband of 2.0 microns and belongs to the field of a laser technology and nonlinear optics. The passive mode-locking ultrashort pulse all-fiber laser with the waveband of 2.0 microns mainly comprises a laser pumping source, a pumping combiner, thulium-doped or thulium-holmium-codoped rear earth doped fibers, a circulator, a saturable absorber, a laser beam splitter, an isolator, a fiber bragg grating, a polarization controller and the like. The thulium-doped or thulium-holmium-codoped rear earth doped fibers are used as a gain medium; the saturable absorber is used as a passive mode-locking device; and the output of an ultrashort laser pulse which is in the waveband of 2.0 microns and has high pulse energy is realized. Due to the adoption of the all-fiber structure design, the passive mode-locking ultrashort pulse all-fiber laser with the waveband of 2.0 microns has the advantages of simple structure, high environment stability and the like, and the industrialization application is easy to realize.

The invention proposes a novel technique for implementing high performance atomic lithography, and in particular high resolution lithography. The technique makes use of Stern-Gerlach type atomic interferometry enabling disturbances to be implemented in the atomic phase of the beam. Such interaction then directly modulates the intensity of the associated wave in the plane extending transversely to the beam of atoms, and does so in controllable manner. The installation of the invention for nanolithography by atomic interferometry comprises a Stern-Gerlach type interferometer comprising, as its phase object, four-pole magnetic induction having a transverse gradient created by four parallel bars carrying alternating direct currents, bracketed between two separator plates, preceded and followed respectively by a spin polarizer and by an analyzer operating by laser pumping. An additional uniform field is being created by another four additional bars powered in paired manner by adjustable currents in order to create a uniform field of arbitrary intensity and orientation for the interference pattern by adjusting the two current parameters. The source of atoms is a source that continuously discharges metastable helium or argon with approximately Maxwell type speed dispersion of about 30% to 40% in order to obtain a central spot.

A surface emitting semiconductor laser device includes a GaAs substrate, and first and second laser sections consecutively and monolithically formed on the GaAs substrate. The second laser section has an active layer structure having a bandgap wavelength longer than the bandgap wavelength of the active layer structure of the first laser section. The second laser section is pumped by a first laser emitted by the first laser section to emit second laser.

A compact solid-state laser array for nonlinear intracavity frequency conversion into desired wavelengths using periodically poled nonlinear crystals. The crystals contain dopants such as MgO and/or have a specified stoichiometry. A preferred embodiment comprises a microchip laser cavity that includes a solid-state gain chip, such as Nd:YVO₄, which also provides polarization control of the laser; and a periodically poled nonlinear crystal chip such as PPMgOLN, for efficient frequency doubling of a infrared laser pump beam into the visible wavelength range. The described designs are especially advantageous for obtaining low-cost green and blue laser sources. The use of such high-efficiency pumps and nonlinear materials allows scaling of a compact, low-cost architecture to provide high output power levels in the blue/green wavelength range.

A Ho:YAG crystal laser is disclosed which is doped with less than 2% holmium to reduce the lasing threshold and up-conversion, thereby increasing the operating efficiency of the laser. The laser does not need sensitizer ions so energy mismatches introduced by the sensitizer ions ale eliminated to the thereby increase the efficiency of the laser while minimizing detrimental thermal loading in the laser caused by up-conversion loss processes. The Ho:YAG crystal laser is directly pumped by a Thulium fiber laser at 1.9 μm at the holmium ⁵I₇ to ⁵I₈ transition to produce an output at 2.1 μm yielding a very low quantum defect. The laser is embodied as a thulium fiber laser pumped oscillator or an amplifier.

The invention discloses a multicolor infrared upconversion luminous material and a preparation method thereof. The material has a chemical composition formula: RE2-x-y(WO4)3: xLn,yYb, wherein x is between 0.02 and 0.2; y is between 0.2 and 0.6; Yb<3+> is used as a sensitizing agent, absorbs infrared photons and transfers energy to Ln in order that Ln ions irradiate; and under 980nm laser pumping, the material emits red light, green light, blue light or white light. In preparation, according to stoichiometric ratio, high-purity raw materials of rare earth oxide and tungsten trioxide are ground, are evenly mixed, are presintered for 3 to 10 hours in air at a temperature of between 700 and 900 DEG C, are ground, are sintered for 4 to 10 hours in the air at a temperature of between 1,100 and 1,200 DEG C and are naturally cooled to the room temperature, so as to obtain the product. In the preparation process, no organism is used; and no harmful exhaust gas is produced. The synthetic process is carried out in the air; and the preparation method has low equipment requirement and a simple process.

The invention discloses a multi-dimensional multiplexing soliton optical fiber laser device which comprises a laser pump source and an annular laser resonant cavity consisting of a gain medium, a dispersive medium, a wavelength division multiplexer, an optical coupler, an optical circulator, a polarization controller and a polarizer. The laser pump source and the gain medium work together so as toprovide a gain amplification mechanism for laser device operation. The dispersive medium can be used for chromatic dispersion compensation of pulse laser so as to achieve chromatic dispersion management of an internal optical path of the laser device, and the optical circulator is a non-reciprocal optical transmission device for coupling the chromatic dispersion medium to construct a bidirectional transmission optical path structure. Via use of the polarization controller, a local polarization state of the internal optical path of the laser device can be changed, and mode-locking operation ofthe pulse laser and adjustment and switching of a mode-locking state can be realized. The multi-dimensional multiplexing soliton optical fiber laser device of the invention can be used for bidirectional transmission, and mode-locking laser pulses can be respectively obtained, generation of polymorphic soliton pulses can be supported, and a wideband wavelengths tuning function and a multiple wavelength switching function can be fulfilled via output laser pulses.

The invention provides a laser device for realizing semiconductor laser beam coupling of a parallel plate prism combination, which consists of two semiconductor laser alternating arrays, two fast axis collimation lenses, two slow axis collimation lenses, a parallel plate glass prism stack, a beam expanding system consisting of two lens pillars and a focusing system consisting of balsaming lenses, wherein all the parts are arranged in parallel; and the invention realizes the high power of kilowatt laser, and overcomes the defects of large volume, low energy efficiency, short service life and the like of a chemical laser, a CO2 laser, a lamp pump and a semiconductor laser pumping the Nd:YAG fundamental frequency of which is 1064nm. The power of the high-power semiconductor laser light source related by the invention can be output in hectowatt to kilowatt and finally can be coupled with an optical fiber. Under the condition of the same power, the volume of the laser device is 1/3-1/10 of that of other lasers, the operation cost is 1/4-1/20 of that of the other lasers, and the service life can be over 10000 hours which is 5-10 times of that of the other lasers.

The invention discloses an all-solid-state laser driving power supply device achieving constant voltage / constant current automatic switching. The all-solid-state laser driving power supply device comprises a main circuit and a control drive circuit, wherein the main circuit is used for adjusting output drive currents according to control signals outputted from the control drive circuit and providing the output drive currents to a laser; the control drive circuit comprises a constant voltage circuit and a constant current circuit, the constant voltage circuit is used for enabling an all-solid-state laser driving power supply to be in a constant voltage mode at a power-on primary stage, and the constant current circuit is used for enabling the all-solid-state laser driving power supply to be in a constant current pattern at a normal operation stage. By the adoption of the drive power supply, the fact that a laser pumping diode cannot be damaged due to rapidly changing driving voltage in the whole operating process of the all-solid-state laser can be achieved.

The invention discloses a Brillouin optical time domain analyzing and sensing system based on ultra-long annular laser pumping. The Brillouin optical time domain analyzing and sensing system based on the ultra-long annular laser pumping comprises first-order raman pump light (16) with the wavelength of 13 xxnm, a wavelength division multiplexer WDM pair (17) and a sensor fiber (18), wherein the wavelength division multiplexer and the sensor fiber form an ultra-long distance annular laser resonant cavity, the first-order raman pump light is fed back by the annular laser resonant cavity to generate lasing light with the wavelength of 14 XXnm. The lasing light with the wavelength of 14 XXnm performs second-order raman amplification on probe light with wavelength of 15 XXnm and Brillouin pumping. In comparison with a Brillouin sensing system based on linear cavity amplification, sensing signals are distributed more smoothly along the optical fiber, and the consistency of sensing quality in the whole process is remarkably improved; noise transfer of pumping-signal relative strength can be effectively suppressed, and temperature, spatial resolution of strain detection and measurement accuracy can be substantially improved; due to the fact that an extra second-order pump light source does not need to be added, substantial stretching of the sensing distance is obtained with low cost, and the Brillouin optical time domain analyzing and sensing system based on the ultra-long annular laser pumping has certain practicability.

The invention discloses a dual-chirp optical parameter amplification method and device for broadband laser pumping. An initial laser source generates narrow-band laser which is divided into two beams, wherein the beam with the high energy is adopted as narrow-band pumping light, and broadband chirp pumping light is obtained after a spectrum widening device, and the light is emitted into a nonlinear crystal through a dichroic mirror; the beam with the low energy enters a super-continuum white light generator and a chirp mirror pair to obtain broadband chirp seed light, is emitted into the non-linear crystal through the dichroic mirror, and is coupled with the broadband chirp pumping light to be subjected to optical parameter amplification; finally, periodic magnitude pulse width femtosecond idler frequency light is obtained through a beam splitter and a pulse compressor. The spectrum widening broadband chirp pumping light is adopted, and the more frequency components are obtained; the broadband chirp pumping light and broadband chirp seed light dual-chirp scheme is adopted, and the instantaneous frequency correspondences are opposite, so that the spectral brand width of output idler frequency light is increased, and the femtosecond idler frequency light output of the periodic magnitude pulse width is achieved.

A high-radiance broadband incoherent light source is provided by pumping a body formed from a doped material, such as a Ce:YAG crystal with one or more laser diodes. The laser diodes emit at a stimulus wavelength, which may be an absorption wavelength of the body, and the body fluoresces to emit broadband light in a wide emission band. The body is either disposed in, or forms a light-concentrating cavity, e.g., reflective surfaces, which may be dichroic surfaces, can be formed on or attached to the sides of the body to concentrate the emitted light. The light is captured by a light collector that is coupled to an output face of the body to produce a broadband illumination beam. One or more of the reflective surfaces forming the light-concentrating cavity may form a heat sink.

Provided are a VECSEL device, which improves optical pumping efficiency by including a mirror reflecting an optical pumping beam, and a method of manufacturing the same. The device includes a lase-pumping unit emitting light having a predetermined wavelength; and a pump laser providing an optical pumping laser beam to the laser-pumping unit. Herein, the laser-pumping unit includes an active layer absorbing the optical pumping laser beam to emit light having a predetermined wavelength; a first reflector reflecting the light emitted from the active layer; and a second reflector reflecting the optical pumping laser beam, which are not absorbed in the active layer but transmit the first reflector, toward the active layer.

The invention discloses a system for measuring linear and non-linear magneto-optical Kerr rotation, which comprises an ultra-short pulse laser, a helium-based closed-cycle refrigerator, an electromagnet, a laser-pumping optical path, a laser-detection optical path, a linear Kerr signal collection optical path, a non-linear Kerr signal collection optical path, a lock-in amplifier signal collection system and a laser spot monitoring system, wherein the helium-based closed-cycle refrigerator is provided with optical windows and used for controlling the temperature of a sample; the size of the air gap and the magnitude of the magnetic field of the electromagnet are adjustable; the laser-pumping optical path is used for leading in the laser inputted by the ultra-short pulse laser and focusing the laser on the surface of the sample inside the refrigerating head, so as to excite the sample; the polarization plane of the laser-detection optical path rotates after a beam of laser outputted by the ultra-short pulse laser is reflected by the sample; the linear Kerr signal collection optical path is used for collecting the base-frequency signal of the detection laser; the non-linear Kerr signal collection optical path is used for receiving the frequency-doubled signal of the detection laser; the lock-in amplifier signal collection system is used for filtering and amplifying the signals and transmitting the signals to a computer for processing; and the laser spot monitoring system is used for accurately controlling the overlap ratio of the pumped beam laser spot and the detected beam laser sport. The system provided by the invention for measuring the linear and non-linear magneto-optical Kerr rotation is capable of simultaneously adjusting the temperature and the intensity of the magnetic field applied to the sample and achieving the measurement of the linear and non-linear magneto-optical Kerr effect on a temperature-variable steady-state basis or a time-resolved dynamic basis.

The invention discloses a high-stability laser pumping source with an overtemperature protection function and belongs to the technical field electronic equipment. The laser pumping source structurally comprises a laser module (1), a power control module (2) and a temperature control module (3). The laser pumping source is characterized by further comprising a display driving module (3) structurally, and the power control module (2) is composed of a power setting module (21), a power sampling module (22), a PID operation module (23), an LD driving module (24), an overtemperature processing module (25) and a soft starting module (26). The laser pumping source is high in stability and has the functions of overtemperature alarming power-off and soft starting.

The invention discloses a rubidium atomic microwave clock based on Faraday laser pumping. By using a Faraday external cavity laser technique with wavelength operated on a rubidium atomic transition spectral line, frequency of output laser is homogenized through high frequency modulation and applied to a pumping source of a rubidium atomic microwave clock so as to obtain a rubidium atomic microwaveclock based on Faraday laser pumping, wherein wavelength of laser generated by a Faraday laser unit is capable of highly stably operating on the rubidium atomic transition spectral line and is insensitive to operating current and temperature of a laser tube; the rubidium atomic microwave clock uses Faraday laser as pumping light, the operating mode that a traditional laser pumped rubidium atomicmicrowave clock requires a servo locking circuit system to stabilize the frequency during laser pumping is subverted, the international problems in laser loss of lock related to laser frequency stabilization are thoroughly solved, and long-term continuous reliable operation is available within a lifetime of the laser tube.