364results about How to "Small divergence angle" patented technology

It is an object of the present invention to provide a semiconductor laser device with high-yielding in which a clack generated in an epitaxial growth layer is restrained and to the manufacturing method thereof, the semiconductor laser device includes a GaN substrate 1, an n-type GaN layer 2, an n-type AlGaN cladding layer 3, a n-type GaN guide layer 4, an InGaN multiple quantum well active layer 5, an undoped-GaN guide layer 6, a p-type AlGaN electron overflow suppression layer 7, a p-type GaN guide layer 8, a SiO2 blocking layer 9, an Ni / ITO cladding layer electrode 10 as a transparent electrode, a Ti / Au pad electrode 11, and a Ti / Al / Ni / Au electrode 12. The SiO2 blocking layer 9 is formed above the InGaN multiple quantum well active layer 5 so as to have an opening. The Ni / ITO cladding layer electrode 10 is formed inside the opening, and which is transparent for the light from the InGaN multiple quantum well active layer, and serves as a cladding layer.

The invention provides a surface-emitting terahertz quantum cascade laser and a manufacturing method thereof. The laser comprises a single mode producing zone waveguide, a cone-shaped coupled zone waveguide and a surface-emitting zone waveguide, wherein the single mode producing zone waveguide and the cone-shaped coupled zone waveguide respectively adopt a first-order grating structure; the surface-emitting zone waveguide adopts a second-order grating structure; single mode terahertz seed light is produced in the single mode producing zone waveguide; the cone-shaped coupled zone waveguide is used for amplifying the terahertz seed light and coupling the terahertz seed light to the surface-emitting zone waveguide; and the surface-emitting zone waveguide enables the terahertz laser light to be exited vertical to the surface of a substrate. According to the surface-emitting terahertz quantum cascade laser, terahertz laser surface emitting with large power, narrow linewidth, small angle of divergence is realized, the laser emission of horizontal high-order mode is restrained to some extent, and the coupling loss and the end face loss between the waveguides are simultaneously reduced.

A vertical cavity surface emitting laser diode includes a lower semiconductor reflector, an active region, an upper semiconductor reflector constituting a resonator with the lower semiconductor reflector, a metallic part being formed on the upper semiconductor reflector, which has a first aperture defining an output region of laser light generated in the active region, and a light confining region being provided between the metallic part and the lower semiconductor reflector, and having a second aperture defining an emission region of the laser light. The upper semiconductor reflector includes a lenticular medium having a convex surface toward the lower semiconductor reflector.

The invention discloses a navigation robot obstacle detection method and system. The system mainly comprises an ultrasonic detection module, an ultrasonic scanning module, an infrared detection compensation module and a robot core control module, wherein the ultrasonic detection module is mainly realized by amplifying a 40 kHz high-voltage driving signal and an ultrasonic receiving signal. The module is erected on a scanning steering engine to realize front non-dead-angle 180-degree scanning detection. By combining infrared range finding, the compensation of a navigation robot ultrasonic blind region is realized. A driving circuit is realized by establishing an H bridge with a field effect transistor. In a navigation robot, planar multi-point sensing is realized by using a pair of ultrasonic probes; the range finding range can reach 5.9 m at farthest; and a detection blind region is reduced to 2 cm. The system has the characteristics of low cost, small detection blind region, high anti-diffraction capacity, high real-time property and the like and has broad industrialization prospect. The method and the system can be used for the fields of micro robot navigation, environmental detection, intelligent vehicle active safety and the like.

Disclosed is a pole sheet laser cutting machine. It comprises a base frame component, a laser cutting device, a cutting manipulator component for driving the laser cutting device, a control system, and at least one sheet feeding assembly; the sheet feeding assembly comprises a material grabbing manipulator component, a fixed length feeding component and a material releasing component, with both the cutting manipulator component and the material grabbing manipulator component being mounted on the base frame component, the fixed length feeding component being arranged between the material grabbing manipulator component and the material releasing component, and the control system being connected to the cutting manipulator component, the material grabbing manipulator component and the fixed length feeding component. The present invention achieves the sheet making process for lithium ion batteries or super capacitors by applying laser technology, which is able to overcome the problems that existed in the prior art through applying a traditional cutting process so that the pole sheets were easily deformed and the burrs were relatively large, etc., and at the same time, the quality of the sheet making process and hence the rate of acceptable products are improved through the control of the control system.

The invention relates to a monolithic phase-locked surface-emitting distributed feedback semiconductor laser array, in particular to a new semiconductor laser array phase-locked structure solving the problems of monolithic incapability and difficult mounting and debugging of a traditional external coupling (Talbot outer cavity) phase-locked technology and the problem of a traditional internal coupling (leakage wave coupling) phase-locked technology that the light extraction efficiency is influenced by the limited width of a light extraction area. The structure comprises distribution Bragg reflectors and surface-emitting distribution feedback semiconductor laser array strips which are periodically and alternately arranged, an outer cavity feedback laser is formed by each surface-emitting distribution feedback semiconductor laser array strip and distribution Bragg reflectors at the left end and the right end, the distribution Bragg reflector at the left end provides the optical feedback of the outer cavity for the outer cavity feedback laser, the distribution Bragg reflector at the right end provides end surface reflection, and another outer cavity feedback laser is formed by the distribution Bragg reflector at the right end and the next laser array strip. The invention can be applied to the fields of military affairs, industries, medical treatment, space optical communication, and the like.

The invention discloses a terminal forming machine and method for a pole piece of a lithium battery. The terminal forming machine comprises an unwinding component (2), a cutting base plate (20), a laser cutting head (9), a winding component (18) and a control system, wherein the cutting base plate (20) is placed on a pole piece motion path between the unwinding component (2) and the winding component (18), the laser cutting head (9) is arranged over the cutting base plate (20), and the control system is connected with the unwinding component (2), the laser cutting head (9) and the winding component (18) through signals. The terminal forming machine and method have the advantages that the pole producing process quality is remarkably improved, the consistency of a battery cell is guaranteed, the pole producing efficiency is improved, and subsequent handling of the pole producing process is facilitated.

The invention provides a particulate matter sensor and a particulate matter monitoring method. The particulate matter sensor comprises an upper cover and a base which form a light shading space comprising an airflow channel and a light transmission channel, wherein the airflow channel is perpendicular to the light transmission channel, and a photoelectric detector is arranged under the crossed region of the airflow channel and the light transmission channel; a laser device is arranged at one end of the light transmission channel, and a light absorption device is arranged at the other end of the light transmission channel; a PCB (Printed Circuit Board) circuit is connected with the photoelectric detector; a laser beam output by the laser device is adopted as a monitoring light source in the particulate matter sensor, so that a light signal generated by laser scattering of particulate matters still can be monitored by the photoelectric detector even if the PM2.5 particulate matters or the particulate matters with relatively small diameters are monitored as laser is collimating light with small divergence angle and high light energy density in unit area, and the monitoring accuracy of the particulate matter sensor during monitoring of the PM2.5 particulate matters or the particulate matters with relatively small diameters in air is improved.

The invention discloses a scattering multi-angle receiving optical system of a scattering-type cloud particle detector based on a single-mode fiber coupling output semi-conductor laser. The optical system of the scattering-type cloud particle detector comprises a transmitting optical unit, a forwards scattering detection unit and a side backward scattering detection unit and uses the single-mode fiber coupling output semi-conductor laser, an aspherical collimating mirror, a square-hole diaphragm and a 4f transformation system so as to not only generate the uniform illumination of needed laser, but also solve the diffraction problem in a beam-cutting process and improve the purity of received scattered light. The cloud particle detector of the invention has two receiving angles and can deduce the phase states of cloud particles according to a ratio of the two electric signals output at the two angles.

The embodiment of the invention relates to the technical field of laser detection, and discloses a laser radar, a control method thereof and an automatic driving device. The laser radar comprises a first transceiving module for transmitting first exiting laser and receiving first reflected laser; a first scanning module for deflecting the first exiting laser and for receiving the first reflected laser, deflecting the first reflected laser and emitting the deflected laser to the first transceiving module; a beam expanding module for expanding and collimating the first exiting laser passing through the first scanning module and emitting the first exiting laser to a first detection area, and for converging the received first reflected laser in a beam shrinking manner and emitting the first reflected laser to the first scanning module; a second transceiving module for transmitting second exiting laser and receiving second reflected laser; and a second scanning module for enabling the second exiting laser to emit to a second detection area, and for receiving the second reflected laser, deflecting the second reflected laser and emitting the second reflected laser to the second transceiving module. Through the mode disclosed by the embodiment of the invention, the ranging capability of the laser radar is improved.

The invention discloses a collimating and beam expanding device for semiconductor laser sources of a laser radar. The collimating and beam expanding device is mainly composed of an aspherical lens, a quartz positive lens, a tunable flange and the like. The collimating and beam expanding device is simple in structure, low in cost and good in beam collimation performance, a divergence angle of a semiconductor laser is compressed from 0.2X0.4rad to below 0.2mrad, and the requirement of the laser radar for probing light sources is met; the device is stable in optical and mechanical properties, can be used under level-18 random vibration at the environment temperature from minus 30 DEG C to minus 50 DEG C, and meets the requirement of the laser radar on stability in bad conditions; the device is provided with the flange, semiconductor laser sources different in divergence angle can be obtained by fine tuning of the flange of the beam expanding device; by tuning of the flange, the device can also be applied to beam collimation of other different-wavelength light sources.

The invention provides a self-calibration dual-station laser horizontal height indicator which comprises a base, adjustable seat legs, a lower cross beam, a middle cross beam, an upper cross beam, a vertical graduated scale, a horizontal laser range finder, a vertical laser emitter, a 45-degree semi-transmittance and semi-reflection mirror, a 45-degree reflector, a lifting pull ring, a gravity adjustment block, a lower cross beam driving mechanism and a middle cross beam driving mechanism, wherein the horizontal laser range finder and the 45-degree semi-transmittance and semi-reflection mirror are fixedly arranged on the lower cross beam; the 45-degree reflector is arranged on the middle cross beam through an angle rotating mechanism; transmittance holes are formed in the lower cross beam and the middle cross beam; a target is arranged on the base; the space positions of the vertical laser emitter, the transmittance holes and the target enable a laser beam output by the vertical laser emitter which naturally drops down to penetrate through the two transmittance holes in sequence and fall onto the target. The self-calibration dual-station laser horizontal height indicator can flexibly and selectively enlarge the distance according to a size of a detected object, so that a measurement distance and the height of the detected object can not be limited; the self-calibration dual-station laser horizontal height indicator can be used for geographical height measurement and object height measurement and is multi-purpose.

The invention relates to a laser detection and control system for barriers between a shield door of a metro platform and a train door, comprising a monitoring unit, a control unit and an alarm unit, wherein, the controller comprises a CPU module, a liquid crystal terminal, a signal isolator, buttons and a safety relay; generating lasers are respectively installed on a front bracket, and a laser receiver or a laser reflection plate is installed on a rear bracket corresponding to the front bracket; the control ends of the generating lasers are connected with the output end of the controller, and the output end of the laser receiver is connected with the input end of the controller; the corresponding output end of the controller is correspondingly connected with the control input end of the shield door; and the corresponding output end of the controller is connected with a buzzer and a caution light of the platform. The laser detection and control system realizes the intelligent operation of judging the existence of barriers between the shield door of the metro platform and the train door, has the advantages of compact integral structure, reasonable cost, easy and convenient installation, simple and intelligent operation, stable and reliable performance, higher practicability and favorable development prospect, and is applicable to metro platform.

The invention provides a thin-layer flow electrolytic cell applicable to electrochemical in-situ Raman spectrum detection. The thin-layer flow electrolytic cell employs the design of a semispherical window; and a solution flows in a right solution channel, a solution chamber and a left solution channel, thereby forming the flow electrolytic cell. Through introduction of the flowing function, the thickness of a solution layer between a working electrode and the window can be substantially reduced, so collection efficiency and detection sensitivity of Raman scattered light are greatly improved while electrochemical measurement is not influenced. Meanwhile, the design of the semispherical window can eliminate the refraction effect of an interface of air and the quartz window, reduce difference between the focus of a laser optical path and the focus of an optical imaging optical path and decreases divergence angles of light, so acquisition efficiency and detection sensitivity of Raman spectra are improved. The thin-layer flow electrolytic cell can monitor dynamic changes of surface adsorbed species in the process of an electrochemical reaction in situ in a wide temperature range and obtains inherent information of surface adsorbed substances related to parameters of reaction kinetics.

The invention relates to a driving three-dimensional omni-directional vision sensor based on a laser diode light source, comprising an omni-directional vision sensor with fixed and single viewpoint, afull-view color body structure optical generator with fixed and single transmitting central point and a microprocessor used for carrying out three-dimensional photographic measurement on the omni-directional images; the viewpoint of the omni-directional vision sensor and the transmitting central point of the full-view color body structure optical generator are configured on a same axis line; theomni-directional vision sensor comprises a photographic unit and a double curved surface catadioptric unit, wherein, the photographic unit is a wide-dynamic CMOS imaging device; the full-view color body structure optical generator comprises a round face body base plate and a group of laser diodes with different luminescence center wavelengths; and the microprocessor comprises an LD light source control unit, a video image reading module, a space information calculating module and a three-dimensional image reconstructing module. The driving three-dimensional omni-directional vision sensor can reduce calculation, fast completes measurement, and has good real time and strong practicability.

The embodiment of the invention provides a backlight source, a display device and a control method thereof, and relates to the field of display technology. While peep-proof display is achieved, a user does not need to carry about a peep-proof film, and the application range is wide. The backlight source comprises a light guide plate and a light source arranged at the outer side of at least one side face of the light guide plate. The backlight source further comprises multiple light limiting strips arranged in an array mode, the light limiting strips are arranged on the surface of a light outlet face of the light guide plate, each light limiting strip comprises two electrodes arranged oppositely and a dimming layer located between the electrodes, and the dimming layers are in a opaque and nonopaque state according to the situation whether an electric field is formed between the electrodes. The backlight source is used for the display device with the peep-proof function and the normal display function switchable.

The invention provides a method for controlling a cusped magnetic field thruster plume divergent angle and relates to the method for controlling the plume divergent angle through cusped magnetic field thruster magnetic interface configuration to solve the problem that an existing cusped magnetic field thruster plume divergent angle is difficult to control. An annular plume control permanent magnet is fixedly arranged on the outer side of a permanent magnet which is arranged on the outmost face of a cusped magnetic field thruster channel outlet, a negative electrode of a thruster sends out electrons, xenon is filled into a discharging channel of the cusped magnetic field thruster, xenon ions are sprayed out of the discharging channel under the action of an electric field which is generated through self-consistence of the xenon ions and the electrons so that inward thrust is generated, annular plume control permanent magnets with different axial lengths and radial lengths are replaced so that the protruding extent of the magnetic interface configuration of the channel outlet can be reduced and the acceleration direction of the xenon ions can controlled, namely, the cusped magnetic field thruster plume divergent angle is controlled. The method for controlling the cusped magnetic field thruster plume divergent angle is suitable for controlling the cusped magnetic field thruster plume divergent angle.

The invention relates to an active three-dimensional panoramic view vision sensor based on a full color panoramic view LED light source, which comprises an omnibearing vision sensor, a panoramic view optical generator with a colorful structure and a microprocessor for performing three-dimensional shooting measurement on an omnibearing image. The omnibearing vision sensor and the panoramic view optical generator with the colorful structure are arranged on the same axial lead; the omnibearing vision sensor comprises an image unit and a hyperboloid catadioptric unit; the panoramic view optical generator with the colorful structure comprises an LED optical generator unit with a colorful structure and a hyperboloid catadioptric unit; a hyperboloid catadioptric mirror surface and a hyperboloid refraction mirror surface have same image parameters; and the microprocessor comprises an LED light source control unit, a video image reading module, a special information calculation module and a three-dimensional image reconstruction module. The active three-dimensional panoramic view vision sensor can reduce the calculation, quickly finish the measurement, and has good real-time property and strong practicability.

The invention discloses a micro-domain laser probe component analyzer based on optical fiber waveguide. The analyzer comprises a Nd:YAG laser, a wavelength-tunable laser, a CCD monitoring camera, a computer, a grating spectrometer, a focusing objective lens, a displacement platform, a digital delay pulse generator, and an enhanced CCD. The focusing lens is a reflective focusing lens. The Nd:YAG laser and the wavelength-tunable laser both adopt optical fiber waveguide for carrying out laser pulse transmission; laser pulse is collimated by using an optical fiber collimator and expanded by a beam expander, and enters the focusing objective lens. Laser pulse transmitted by the Nd:YAG laser burns a surface micro-domain on a sample to be analyzed, such that plasma is formed; the laser pulse transmitted by the wavelength-tunable laser is applied on the plasma, such that resonance excitation is caused; one end of the optical fiber is used for collecting spectral signal transmitted by the plasma, and the other end is connected with an optical fiber interface of the grating spectrometer. According to the invention, precise qualitative and quantitative analysis of laser probe upon substance micro-domain components can be realized.

The invention provides a laser beam combiner for simultaneously detecting various types of gas of a TDLAS (Tunable Diode Laser Absorption Spectroscopy) and belongs to the technical field of laser gas detection. In the prior art, the attenuation is high, the work wavelength range is narrow and the construction cost of a beam combining part is high. The laser beam combiner is characterized by being provided with a plurality of paths of incidence optical fibers; an emergent end of each path of the incidence optical fiber is connected with a collimating mirror and each incidence optical fiber is a single-core and single-mode optical fiber; mutually-parallel optical axes of the plurality of collimating mirrors of the plurality of paths of incidence optical fibers are parallel to the optical axis of a concave spherical surface reflection mirror; the mutually-parallel optical axes of the plurality of collimating mirrors intersect with a reflection surface of the concave spherical surface reflection mirror; an incidence end face of an emergent optical fiber is located on a reflection surface focus point F of the concave spherical surface reflection mirror and is vertical to the optical axis of the concave spherical surface reflection mirror; the emergent optical fiber is a single-core and multi-mode optical fiber; the numerical aperture of the concave spherical surface reflection mirror is less than that of the emergent optical fiber.

It is an object of the present invention to miniaturize a reflective liquid crystal projector to such a degree that it can be built in a small-sized apparatus such as a portable telephone terminal.Laser light beams (1R), (1G), (1B) are diffused and shaped by diffractive optical devices (21R), (21G), (21B) such that they are introduced to corresponding pixels of a liquid crystal layer (41) over an overall area of a display region of a reflective liquid crystal panel (40).The diffused and shaped laser light beams (2R), 2(G), 2(B) are introduced to the reflective liquid crystal panel (40) through a field lens (31) and a polarizing beam splitter (33). Red, green and blue pixels are formed on the reflective liquid crystal panel (40), and a microlens array is formed on an incoming and outgoing side substrate (50) while reflecting layers corresponding to the pixels are formed on a reflection side substrate (60). The laser light fluxes of the colors are distributed and condensed by the microlenses and introduced to the corresponding pixels and then reflected by the corresponding reflecting layers.Also it is possible to use refractive optical devices in place of the diffractive optical devices.

The invention discloses an LED-excited short wavelength infrared fluorescent microscopic imaging system. In the system, laser light emitted by a single-color LED passes through a collimating lens to be collimated firstly and is introduced into a light path of a microscope vertical illumination device, the exciting light is reflected with a dichroic beam combiner and converges onto a back focal plane of a microscopic objective, converging light forms parallel exciting light beams after passing through the objective and illuminates onto a sample, and a fluorescence probe in the sample is excitedto emit fluorescence; and a fluorescence signal passes through the objective, penetrates through the dichroic beam combiner and is finally received by a detection surface of an InGaAs camera to realize photoelectric conversion, and the signal is transmitted to a computer for data processing to obtain an imaged picture or a video. The LED-excited short wavelength infrared fluorescent microscopic imaging system has the remarkable advantages of high signal-to-noise ratio, high magnification, high resolution, capability of real-time imaging, capability of tomography, large penetration depth, small tissue damage and the like.

The invention relates to the field of laser, in particular to a light beam shaping structure of a semiconductor array laser which adopts a self-focusing lens with special structure, a non-spherical lens, a spherical lens or array and a cylindrical lens or a combination of cylindrical lenses to reshape all the luminous points into parallel light beams having minimized angle, high power compression is carried out on semiconductor light beam along the direction of prolate axis by adopting a single prism, a combination of prisms or raster array, and the obtained light beam can be directly and effectively coupled to multimode fiber and high power doubly coated fiber, or used in an end pump laser, or the obtained light beam can be effectively coupled to multimode fiber and high power doubly coated fiber, or used in an end pump laser by passing through a plus lens. The invention is a novel light beam shaping structure of the semiconductor laser and has the advantages of larger spot diameter of the output beam, smaller divergence angle and further operating distance.

The invention provides a wearable device and a photoelectric pulse sensing assembly, and relates to the technical field of electronic devices. The divergence angle of light emitted by a luminous component in the wearable device can be decreased, the utilization rate of the light is increased, thus the detection accuracy of the heart rate, blood oxygen saturation degree and other parameters can beincreased, and power dissipation is reduced; the wearable device includes a substrate, one or more luminous components, light, and one or more lenses, wherein the luminous components are mounted on one side of the substrate, light is configured to emit one or more optical bands, the lenses are arranged on the light emitting sides of the one or more luminous components, each lens corresponds to oneor more luminescent components, and each lens can decrease the divergence angle of the light emitted by the one or more emitting components corresponding to the lens. The photoelectric pulse sensingassembly can be mounted in a wearable object, so that when the wearable object is worn on a target organism, the heart rate, blood oxygen saturation degree and other parameters of the target organismcan be detected.

The invention provides an online monitoring device for a micro-optics lens in a semiconductor laser to be precisely adjusted and a using method of the online monitoring device. According to the technical scheme, the method comprises the steps that a CCD is adopted as a light spot data collecting component, near-field light spot data and far-field light spot data are monitored online at the same time during adjusting of the micro-optics lens based on the light beam splitting principle, the near-field CCD light spot data change serves as the optimal space position basis of a rotating axis of the micro-optics lens, the far-field CCD light spot data change serves as the optimal space position basis of a displacement axis of the micro-optics lens, and the fast and slow axis light beam divergence angle and directivity of the semiconductor laser can be precisely controlled. The online monitoring device has the advantages of being high in system integrity, precise and reliable in monitored judgment data and the like. The low-divergence-angle and high-directivity semiconductor laser obtained based on the online monitoring device can be applied to various fields such as pumping solid lasers, medical treatment and industrial machining.

The invention discloses an active three-dimensional omnidirectional vision-based river width measuring device, which comprises a GPS sensor, a sonarprobe, an ominidirectional vision sensor with a fixed and single viewpoint, a full-view color body structure optical generator with fixed and single transmitting central point, and a microprocessor used for carrying out three-dimensional photographic measurement on the river width, acquiring river map data and fusing river depth data; the viewpoint of the omnidirectional vision sensor and the transmitting central point of the full-view color body structure optical generator are configured in the same axis line; and the omnidirectional vision sensor, the full-view color body structure optical generator, the GPS sensor and the sonarprobe are fixed in the extended line of the same upright post. The active three-dimensional omnidirectional vision-based river width measuring device has the advantages of quick measurement, good real-time, strong practicability and high robustness.

The invention relates to a vertical-external-cavity surface-emitting semiconductor laser with an integrated micro lens and belongs to the technical field of semiconductor optoelectronics. The vertical-external-cavity surface-emitting semiconductor laser solves the problems of high difficulty in structural manufacturing and instability in operation of an existing VECSEL (vertical vertical-external-cavity surface-emitting-laser). The laser comprises an N-face electrode, an N-type substrate, an N-type DBR (distributed bragg reflector), an active layer, an oxidation limiting layer, a P-type DBR, a P-face electrode, a micro lens structure, an external coupled cavity and an external cavity DBR. When the P face is used for light outgoing, the micro lens structure is positioned at a light outlet and formed on the P-type DBR, the external coupled cavity grows on the micro lens structure, and the external cavity DBR grows on the external coupled cavity. When the N face is used for light outgoing, the micro lens structure is positioned at the light outlet and formed on the N-type DBR, the external coupled cavity grows on the micro lens structure, and the external cavity DBR grows on the external coupled cavity. The problem of failure in alignment of an external cavity reflector center to a light outlet center is solved by the integral structure of the vertical-external-cavity surface-emitting semiconductor laser.

The invention relates to a near single module quasi gradient refractive rate large mode field gain optical fiber and a preparation method. The gain optical fiber comprises a fiber core, a wrapping layer wrapped on the outer portion of the fiber core and an annular gain area arranged between the gain fiber core and the wrapping layer. The near single module quasi gradient refractive rate large mode field gain optical fiber and the preparation method achieves laser output with high light beam quality, is capable of obtaining large mode field area and effectively improves output power of an optical laser device.

An optical homogenizer has a square incident surface and an exit surface with a shape relative to that of active region of optical gate. An optical device with said optical homogenizer positioned between light source and optical gate is also disclosed. Its advantage is high greatly decreased divergence angle for its exit surface.