34results about How to "Reduced diffraction loss" patented technology

A unipolar semiconductor laser is provided in which an active region is sandwiched in a guiding structure between an upper and lower cladding layer, the lower cladding layer being situated on a semiconducting substrate. The unipolar semiconductor laser comprises a raised ridge section running from end to end between end mirrors defining the laser cavity. The ridge section aids in optical and electrical confinement. The ridge waveguide is divided in a plurality of cavity segments (at least two). Lattice structures can be arranged to these cavity segments. Each cavity segment is in contact with upper metallic electrodes. A metallic electrode coupled to the bottom surface of the semiconducting substrate facilitates current injection through the device.

The invention relates to a low-threshold-value femtosecond pulse fiber laser. The low-threshold-value femtosecond pulse fiber laser consists of an optical-fiber coupling semiconductor laser, a wavelength division multiplexer, a ytterbium-doped single-mode gain fiber, two optical-fiber collimators, two quarter slides, two half slides, a polarization beam splitter, a faraday rotator, two reflection gratings, a reflection mirror and an optical isolator. The femtosecond laser adopts a semi-space semi-fiber annular cavity structure, the combined action of the faraday rotator and the half slides is adopted, and a group of grating pairs is adopted to carry out intra-cavity chromatic dispersion management on the laser, so that the polarization direction of the laser which passes through the faraday rotator twice is enabled to rotate for 90DEG and to be reflected from a vertical reflection port of the polarization beam splitter, a light path can be prevented from being lowered, and the introduction of an additional reflection mirror can be avoided; The polarization direction of the incident light which radiates on the first reflection grating is adjusted through the half slides, so that the highest diffraction efficiency can be achieved, the intra-cavity loss of the laser can be reduced, and an effect for reducing a mode locking threshold value can be realized.

The invention relates to a fiber coherence coupling method of high power semi-conductor laser array and the fiber-shaping device, belonging to the laser technique field. The characters of invention comprise: guiding the fiber into the space between the semiconductor laser array and the external-cavity glass; using microlens to compress the fast axis divergence angle of each luminous unit, to make N luminous units be coupling to N fibers one to one; utilizing the flexibility of fiber, rearranging the fiber on the another end of fiber into the fiber array with bidimensional periodic time. The designed fiber shaping device is arranged between the semi-conductor laser array (1) and the external-cavity glass (6), comprising aligning hub (3), fiber (4) and rearrangement hub (5); the compressed fiber, via the microlens, is one-to-one coupling to the fiber which is fixed in the aligning hub, while the rearrangement hub rearranges and fixes another end of with bidimensional fiber. The invention reaches the rearrangement of luminous light beam and improves the coherence coupling of high power semi-conductor laser array.

A converging optical apparatus reduces the diffraction loss and realizes compatibility with three different wavelengths by means of a hologram element. The present invention provides an optical pickup for recording signals on and/or reproducing signals from a plurality of optical discs having respective protection substrates of different thicknesses for protecting the recording surfaces thereof by means of light beams of different wavelengths, the optical pickup including a first emission section that emits a light beam of a first wavelength, a second emission section that emits a light beam of a second wavelength, a third emission section that emits a light beam of a third wavelength, an objective lens for converging the light beams of the first through third wavelengths emitted respectively from the first through third emission sections on the signal recording surfaces of the optical discs, and a hologram element arranged between the first through third emission sections and the objective lens, the hologram element having two major surfaces, wherein the hologram element is provided with a reference curved surface on one of the major surfaces thereof, the reference curved surface being an aspherical shape, and a hologram section is formed on the reference curved surface.

The invention provides a waveguide mode-locked laser, comprising a semiconductor saturable absorption mirror, a waveguide grain medium, a waveguide grating and a pumping source. The semiconductor saturable absorption mirror and the waveguide grating are respectively arranged at the both ends of the waveguide grain medium; and the pumping source is arranged above the waveguide grating. According to the waveguide mode-locked laser provided by the invention, the semiconductor saturable absorption mirror is fixedly arranged at one end of the grain medium by using a special means as a cavity mirror in a laser cavity; and furthermore, the grating is written into a waveguide channel on a doped substrate in a point-to-point manner by using a femtosecond micromachining system, and the passive mode locking is realized by utilizing dispersion compensation of the grating and characteristics of the semiconductor saturable absorption mirror.

A second-order multi-mode partial distributed feedback (p-DFB) laser having increased electrical-to-optical power conversion efficiency, stabilized wavelength and narrowed emission linewidth. The laser includes an abbreviated grating housed in the laser cavity that is separated from both the front-end and the back-end of the laser facets.

A method for manufacturing a laser array and combiner monolithic integration chip comprises the steps that an n-type InP buffer layer, an n-type AlGaInAs covering layer, an AlGaInAs multi-quantum well layer, a p-type AlGaInAs covering layer, an InP interlayer, an InGaAsP grating layer and an InP sacrificial layer are grown on an n-type InP substrate in sequence to form a substrate, an active region is arranged on one side of the base chip, and a combiner region is arranged on the other side of the substrate; P ions are injected into the InP sacrificial layer of the combiner region, and fast thermal annealing is carried out; the InP sacrificial layer is removed, and gratings are manufactured in the InGaAsP grating layer of the active region; a p-type InP covering layer and a p-type InGaAs contact layer are grown on the InGaAsP grating layer of the active region and the InGaAsP grating layer of the combiner region; the p-type InGaAs contact layer, the p-type InP covering layer, the InGaAsP grating layer and the InP interlayer are removed through dry etching, ridge type waveguides of all laser units are formed in the active region, and combiner ridge type waveguides are formed in the combiner region; p electrodes are manufactured on the ridge type waveguides of the active region; the n-type InP substrate is thinned, an n electrode is manufactured on the back face of the n-type InP substrate, and manufacturing is completed.

The embodiment of the invention discloses a millimeter wave wireless charging device which comprises a millimeter wave generator used for generating and emitting millimeter waves, wherein the millimeter waves are used for charging to-be-charged equipment. The device further comprises a laser sight and a rotating platform, wherein the laser sight is fixedly mounted on the millimeter wave generator and used for emitting and receiving laser beams; the laser beams and the millimeter waves are the same in emission direction; the millimeter wave generator is fixedly connected to the outer surface of the rotating platform; the rotating platform is used for adjusting the direction of the millimeter waves emitted by the millimeter wave generator through rotation. The laser sight is further used for calculating the corresponding reflectivity of the received laser beams and generating a first control signal used for controlling the rotating platform to pause rotating and a second control signal used for controlling the rotating platform to rotate according to the reflectivity. After the adoption of the millimeter wave wireless charging device provided by the invention, the wireless charging efficiency can be improved.

A converging optical apparatus reduces the diffraction loss and realizes compatibility with three different wavelengths by means of a hologram element. The present invention provides an optical pickup for recording signals on and/or reproducing signals from a plurality of optical discs having respective protection substrates of different thicknesses for protecting the recording surfaces thereof by means of light beams of different wavelengths, the optical pickup including a first emission section that emits a light beam of a first wavelength, a second emission section that emits a light beam of a second wavelength, a third emission section that emits a light beam of a third wavelength, an objective lens for converging the light beams of the first through third wavelengths emitted respectively from the first through third emission sections on the signal recording surfaces of the optical discs, and a hologram element arranged between the first through third emission sections and the objective lens, the hologram element having two major surfaces, wherein the hologram element is provided with a reference curved surface on one of the major surfaces thereof, the reference curved surface being an aspherical shape, and a hologram section is formed on the reference curved surface.

This invention discloses an anti-detuning laser resonator with high optical beam quality including an output mirror and a rear mirror set oppositely in co-axis, said rear mirror is in the shape of right angle taper of 90deg. This invention is helpful to realize output of laser of high beam quality having the advantages of anti-detuning, easy tuning, no hard edge difraction loss and high emission rate.

The invention relates to a long-distance resonance light wireless energy supply device based on a telescope optical modulator. The device comprises a transmitter and a receiver, a first retro-reflector and a gain module are arranged in the transmitter. A second retro-reflector and a photoelectric conversion module are sequentially arranged in the receiver; a resonant light resonant cavity is formed between the first retro-reflector and the second retro-reflector; a telescope optical modulator is arranged in the transmitter; and the first retro-reflector, the gain module and the telescope optical modulator are sequentially arranged along an optical path. Compared with the prior art, the long-distance resonance light wireless energy supply device has the advantages that resonance light is compressed and stabilized, diffraction loss is reduced, high-power long-distance stable energy output is achieved, and the like.

A prism unit, which is capable of firmly fixing a plurality of prism parts in a small space, and a laser device, which is capable of enhancing output power of laser light with use of the prism unit, are provided. For this purpose, a prism unit (28) includes a plurality of prism parts (35), which refract incident light (21), and a fixed part (36) which is fixed to or formed integrally with at least two of the plurality of prism parts. Further, a laser device includes the prism unit (28), and only a wavelength in a desired range out of a plurality of oscillation wavelengths is selectively oscillated by the prism unit.

The invention relates to a high-efficiency hydrogen fluoride laser grating unstable resonator. The resonator is an annular chamber and comprises a convex-surface reflecting mirror, a concave-surface reflecting mirror, a film polaroid, a quarter wave plate, a half wave plate, plane total reflecting mirrors, a blazed grating, and a scraper mirror etc. Through change of the polarization characteristic of the oscillation light in the resonator, spherical waves in the resonator are changed into plane waves and reflected to the blazed grating, the aberration of the grating caused by diverging spherical waves of the conventional unstable resonator is reduced, the efficiency of the first-order diffracted light of the blazed grating is improved, and high-efficiency output of hydrogen fluoride single-spectral-line laser is realized.

A side grating based light coupling system comprises an optical fiber, a side grating disposed on one side of the lateral wall of the optical fiber, and a laser array disposed adjacent to the other side of the lateral wall of the optical fiber. The side grating comprises a plurality of grating elements arranged in a non-uniform arrangement. The laser array for generating a laser beam towards and passes through the optical fiber, and the laser beam is converted into at least one laser beam through the plurality grating elements. The diffraction efficiencies of the converted laser beams are different. The converted laser beams propagate inside the optical fiber based on total internal reflection. The plurality of grating elements of the side grating are heterogeneous arrangement without loading the optical collimating lens, and can reduce scattering loss by controlling the asymmetric diffraction efficiency, to improve optical coupling efficiency.

The invention discloses a laser gain structure and a laser. The laser gain structure includes gain tubes for increasing light beam energy under the action of a pump source. A first fluid passage is formed in each gain tube. The outside of each gain tube is wrapped in a sealing tube. A gap exists between each sealing tube and the corresponding gain tube. A second fluid passage is formed in each gap. The first fluid passages and the second fluid passages are used for passing a cooling medium so as to make the temperature of the outside of the gain tubes and the inside of the gain tubes tend to coincide. The outside of each gain tube is also wrapped in a reflective surface for total reflection of light beams. When the laser gain structure of the embodiments is used for increasing the laser energy, diffraction loss of the laser beams in a propagation process can be reduced. The gain tubes are better in cooling effect and higher in energy storage so as to achieve output with higher energy.