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

A vertical laser cavity includes a non-planar top mirror in order to improve the optical performance of the laser cavity. In one approach, the top mirror is curved to form a plano-concave geometry with the bottom mirror, as opposed to the typical plano—plano geometry. This can reduce diffraction losses and otherwise improve optical performance.

The invention relates to the technical field of thermo-optical tuned filter, and discloses a photon crystal tunable filter, comprising a lower reflector, a separation wall and an upper reflector on the silicon on an insulation layer (SOI) and air ports through the upper reflector, the separation wall, the lower reflector and the top silicon of SOI. The invention also discloses a preparation method for the photon crystal tunable filter. With the method, the invention can reduce the uneven film temperature from the traditional heating of film resistance, lift the limit of the minimum size of input light spot caused by the diffraction loss, lower the consumption and the power of the tunable filter and accelerate the tuning speed of the tunable filter.

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 on and / or adjacent 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.

Present invention relates to a strip waveguide laser outgoing laser conversion reshape method. Present invention uses two cylindrical mirror or cylindrical lens constituting one dimension directional extend beam system, making extend beam to short arm direction of rectangular cross section light beam, to form foursquare cross section light beam then utilizing two spherical reflector or spherical lens to form two-dimensional directional extend beam system, to convert foursquare cross section light beam into required size, at the same time setting one round or variety shape spatial filter on intermediate focus accessory of two spherical reflector or spherical lens, to make output beam cross section becoming circular symmetry or variety shape. Reshaped light beam can be widely used to laser technology field.

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 invention relates to the technical field of thermo-optical tuned filter, and discloses a photon crystal tunable filter, comprising a lower reflector, a separation wall and an upper reflector on the silicon on an insulation layer (SOI) and air ports through the upper reflector, the separation wall, the lower reflector and the top silicon of SOI. The invention also discloses a preparation methodfor the photon crystal tunable filter. With the method, the invention can reduce the uneven film temperature from the traditional heating of film resistance, lift the limit of the minimum size of input light spot caused by the diffraction loss, lower the consumption and the power of the tunable filter and accelerate the tuning speed of the tunable filter.

The invention discloses a solid laser resonator system of automatic optimizing laser pattern, which comprises the following parts: output cavity lens, reflective deforming lens, gain dielectric, narrow-band filter, facular detector, beam splitter, power meter, high-pressure amplifier, main control computer, telescope, image gathering card, focal lens and control algorism. The invention utilizes reflective deforming lens with high reflectance to replace common plane reflective lens as reflective end lens of resonator, which generates kinds of high-low stepped optical aberration to inhibit high-step laser, in order to output high-brightness basic mould. The invention possesses simple structure to be controlled conveniently, which improves the quality of output beam without reducing the output power.

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.

The invention relates to a method for measuring transmission loss of an optical element. The method comprises the following steps that: continuous laser is reshaped through a mode matching lens, and then enters an optical resonant cavity along an optical axis; two iris diaphragms of which the standoff distance is slightly larger than the thickness of the optical element to be measured are placed into the optical resonant cavity, wherein the clear aperture is less than the aperture of the optical element to be measured; after a shutoff laser beam is triggered, an output signal of the optical resonant cavity is recorded to fit fading time tau 0; the optical element to be measured is placed between the two iris diaphragms in the optical resonant cavity; the optical element to be measured is adjusted to make the surface of the optical element vertical to the optical axis; the output signal of the optical resonant cavity is recorded to fit fading time tau 1; the angle of the optical element to be measured is adjusted to make directly reflected light on the surface escape from the optical resonant cavity; the output signal of the optical resonant cavity is recorded to fit fading time tau 2; the absorption loss A of the optical element to be measured can be acquired by using the tau 0 and the tau 1; and the surface antireflective film residual reflectance R of the optical element to be measured is acquired by using the tau 1 and the tau 2. The method has the advantages of simple structure, high measurement precision, low system cost and the like.

The invention provides an optical resonant cavity formed by non-parallel reflecting mirrors and a method for generating optical resonance. The optical resonant cavity comprises a top reflecting mirror and a bottom reflecting mirror, and is characterized in that a cavity is formed between the top reflecting mirror and the bottom reflecting mirror, and the cavity is filled with a medium; the top reflecting mirror comprises two oppositely arranged plane reflecting mirrors, and the two plane reflecting mirrors have the same inclination angle relative to the bottom reflecting mirror; and the bottom reflecting mirror is a plane reflecting mirror. According to the invention, the resonant cavity is provided with the inclined top reflecting mirror, so that an incident beam perpendicular to the bottom reflecting mirror is enabled to be increased in optical path during reproduction in the process of advancing in the resonant cavity. The optical resonant cavity provided by the invention has different resonance conditions from a parallel plane resonant cavity, and can acquire small linewidth and a greater Q-value. In addition, the optical field energy can be effectively controlled within a certain area, and the diffraction loss is reduced.

Present invention relates to a strip waveguide laser outgoing laser conversion reshape method. Present invention uses two cylindrical mirror or cylindrical lens constituting one dimension directional extend beam system, making extend beam to short arm direction of rectangular cross section light beam, to form foursquare cross section light beam then utilizing two spherical reflector or spherical lens to form two-dimensional directional extend beam system, to convert foursquare cross section light beam into required size, at the same time setting one round or variety shape spatial filter on intermediate focus accessory of two spherical reflector or spherical lens, to make output beam cross section becoming circular symmetry or variety shape. Reshaped light beam can be widely used to laser technology field.