35 results about "Photomixing" patented technology

The invention relates to technology for simultaneously measuring multi-phase flow particles online through multi-parameter, and aims to provide a method and a device for simultaneously measuring droplet positions, particle sizes and a complex refractive index. The method comprises the following steps of: (1) dividing a highly coherent continuous laser beam into two beams after spatial filtering and collimating beam expansion, wherein one beam radiates particles in a detected flow field region, and the other beam is used as a reference beam; (2) mixing scattered light of a lateral 30-degree to 90-degree region of particles in the detected flow field region and the attenuated reference beam to perform interference so as to form a hologram, storing the hologram in a computer after being recorded by a digital camera through an imaging device; (3) acquiring a series of reconstructed images of the detected particles along the depth direction by utilizing digital reconstruction technology; and (4) identifying the reflective spot and the refractive spot of the particles from the reconstructed images by utilizing digital image processing technology so as to acquire space coordinates and scattered light intensity ratios. Compared with rainbow measurement technology, the measurement method has the advantages that: a light path system of the measurement device is relatively simple and is easy to implement.

The invention discloses a light emitting unit, an optical signal detection module, an optical system and a laser radar system. The light emitting unit comprises a light source subunit, a high frequency modulation subunit and a difference frequency subunit; the light source subunit emits an initial light beam; the high frequency modulation subunit modulates the frequency of the initial light beam via a photomixing technology, and emits at least two different frequencies of high frequency emission signals; the difference frequency subunit caries out difference frequency processing on two randomfrequencies of high frequency emission signals, and emits at least one type of low frequency emission signal; and at least one type of high emission signal and at least one type low frequency emissionsignal as detection light signals are emitted by the light emitting unit. Thus, the initial light beam emitted by the light source subunit is modulated via photomixing and difference frequency technologies, time for light beam modulation is shortened, the detection light signals are emitted at a higher speed, and the detection speed of the laser radar system is improved.

Disclosed is an RGB light emitting diode package with improved color mixing properties. The RGB light emitting diode package includes red, green, and blue light emitting diode chips provided on a reflector, on which elements are to be installed or mounted. A photomixing material and a filler resin scatters rays so as to uniformly mix the rays emitted from the light emitting diode chips. The photomixing material and filler resin are applied onto upper sides of the light emitting diode chips while being mixed with each other, and the photomixing material is uniformly dispersed in the filler resin. The RGB light emitting diode package according to the present invention is advantageous in that since it has excellent color mixing properties in a relatively small area, it is possible to achieve slimness of the package, while it is difficult to design a slim package using a conventional process in which there is a limit that an area large enough to mix colors must be provided.

The invention provides a low-temperature co-fired ceramic material emitting white light and a preparation method thereof. The ceramic material comprises the following components in percentage by mol: 10 to 20 percent of CaO, 20 to 30 percent of B2O3, 50 to 60 percent of SiO2, and 1 to 9 percent of optical activating agent ions. The invention also relates to the preparation method of the material, namely, a sol-gel method for preparing the low-temperature co-fired ceramic material emitting white light. The invention has the advantages that: 1, the preparation process is simple and advanced, the sintering temperature is low by adopting the Sol-gel method and is between 800 DEG C and 900 DEG C, the sintering shrink rate at the temperature is controllable between 13 percent and 17 percent, and a glass ceramic material has a flat and smooth surface, as well as higher strength; 2, the dielectric constant is adjustable between 4(1MHz) and 6 (1MHz), and the coefficient of dielectric loss is lower than 0.002; 3, the light emission intensity is high, the material can emit yellow and blue light under activation of ultraviolet light with the wavelength of between 320nm and 410nm, the white light obtained by mixing the blue light and the yellow light can be used for illuminating and displaying; and 4, based on the advantages, the low-temperature co-fired ceramic material can be applied to the fields of white light LED (Light Emitting Diode) lamps, integrated ceramic substrates and other electronic devices and semiconductors, as well as microelectronic packaging materials.

A device for measuring and characterizing solid-state devices or integrated circuits at RF frequencies up to 1.0 THz and beyond is provided that includes a transmitting photomixing probe structure and a receiving photomixing probe structure. The transmitting photomixing probe structure and the receiving photomixing probe structure are ac-coupled to the solid-state device or integrated circuit in a contact-free manner.

The invention discloses a multi-wavelength GaN-based asymmetric quantum well surface emitting laser and a manufacturing method thereof, which relate to the field of semiconductor lasers. asymmetric quantum wells are adopted as active regions to realize multi-wavelength output of the laser, and two and more than two laser wavelengths are included. The device manufacturing process comprises nonplanar metal bonding, laser lift-off, cavity length control, graphic distributed Bragg reflector making and the like. The multi-wavelength surface emitting laser has a great application potential and can be applied to multiple fields such as space precise distance measurement, a Terahertz signal generator, photomixing, laser spectroscopy, medical examination, augmented reality (AR) and three-dimensional imaging. The multi-wavelength GaN-based asymmetric quantum well surface emitting laser and the manufacturing method thereof have the advantages that a two-dimensional array structure of the device can be realized easily, large-scale industrial production is facilitated, and commercialization and practicality of the device are facilitated.

The invention discloses a photoelectric hybrid phase-locked loop. The photoelectric hybrid phase-locked loop comprises a signal light source, a local oscillation laser source, an oscillation signal source, a 2*490DEG free space optical bridge, a first balance detector, a second balance detector, a first frequency mixer, a second frequency mixer, a third frequency mixer, a first adder, a second adder, a power detector, a band-pass filter, a low-pass filter, a voltage-controlled oscillator, a first phase shifter, a second phase shifter and a signal receiver. The light and the electricity are separated, the light and the light are mixed, and the electricity and the electricity are mixed; in the electric field, an oscillation signal is imported to perform the phase-locking; the requirement onthe local oscillation laser source is reduced to realize the fast locking, and the influence by the crosstalking between a data channel and a phase-locked channel is avoided, the transmission of the residual carrier is unnecessary. The photoelectric hybrid phase-locked loop has important significance for the future free space coherent light communication.

The invention discloses a digital-analog hybrid integrated optical transceiving SIP assembly. The assembly comprises a substrate with pins at edges to send electric signals, a digital-analog hybrid circuit integrated on the substrate and used for photoelectric and electro-optical conversion, a tube shell fixed on the substrate and used for sealing the digital-analog hybrid circuit and an optical fibber. One end of the optical fiber is connected with the digital-analog hybrid circuit, and the other end of the optical fiber is connected with an AMT connector outside the tube shell so as to transmit optical signals. The digital-analog hybrid circuit comprises a detector chip, a radio frequency matching network, a low-noise amplifier, an equalizer, an attenuator and a filter. The digital-analog hybrid circuit further comprises a PIN photodiode, a transceiving integrated driving chip, a VCSEL chip and a single-chip microcomputer serving as a substrate core processor. The digital-analog hybrid integrated optical transceiving SIP assembly combines the advantages of ultrahigh frequency, large bandwidth, transparent transmission and the like of microwaves and the advantages of ultrahigh speed, low power consumption and high integration level of light, and has the characteristics of microwave and optical hybrid integrated transmission, ultra-miniaturization, high integration level, intelligence, high reliability and the like.

A continuous wave (CW) heterodyne light detection and ranging (LIDAR) air velocity sensor system that comprises a first light emitting structure arranged to send a signal light in a first direction inspace; a second light emitting structure arranged to produce a local oscillator light having a wavelength different from the wavelength of the signal light by a predetermined wavelength; a receiver arranged to receive light from said first direction in space; and a first optical mixer for mixing the received light with said local oscillator light.

The present disclosure is directed to a sun-sky-imitating illumination device (100) for generating natural light similar to that from the sun and the sky, comprising a direct-light generator (10) that comprises a first emitting surface (11) from which a direct light (13) is emitted and a collimated light source (20) configured to generate from a primary light a collimated light (23) which exits an output surface (22) positioned upstream from the first emitting surface (11) with respect to a direct light direction (15), wherein the direct light (13) has a luminance profile (Ldirect(x, y, θ, φ)) which has a first peak in the angular distribution around the direct-light direction (15) and the collimated light (23) exiting the output surface (22) has a luminance profile (Lcoll(x, y, θ, φ)) which has a second peak (14) in the angular distribution around the direct-light direction (15), the second peak being a narrow peak, and a diffused-light generator (50) that is at least partially light-transparent and is positioned downstream of the direct-light generator (10) and comprises a second emitting surface (51) and is configured to cause diffused light (53) at the second emitting surface (51), wherein the sun-sky-imitating illumination device is configured such that the direct-light generator (10) and the diffused-light generator (50) co-operate to form outer light (53,54) at the second emitting surface (51) which comprises a first light component (54) which propagates along directions contained within the narrow peak (14) and a second light component (53) which propagates along directions spaced apart from the narrow peak (14), wherein the first light component (54) has a CCT which is lower than a CCT of the second light component (53), wherein the direct-light generator (10) comprises an optical unit (30) positioned downstream of the output surface (22) of the collimated light source (20) and upstream from the first emitting surface (11) with respect to the direct light direction (15), wherein the optical unit (30) is configured to interact with the collimated light (23) exiting the output surface (22) to generate the direct light (13) emitted from the first emitting surface (11) so that the first peak of the luminance profile (Ldirect(x, y, θ, φ)) of the direct light (13) is larger than the second peak of the luminance profile (Lcoll(x, y, θ, φ)) of the collimated light (23), the optical unit (30) comprising a first planar light mixing element (33,33′) characterized by a first response function having a first angular profile with a peak having a first divergence angle (α1, α1′) measured as full width at half maximum (FWHM) of the peak, the first planar light mixing element (33,33′) being positioned so as to at least partially intercept the collimated light (23) exiting the output surface (22) of the collimated light source (20) and to define a unit input surface (31), and a second planar light mixing element (34) characterized by a second response function having a second angular profile with a peak having a second divergence angle (α2) measured as full width at half maximum (FWHM) of the peak, the second planar light mixing element (34) being positioned downstream of the unit input surface (31) so as to at least partially intercept the light crossing the unit input surface (31) and to define a unit emitting surface (32), wherein the first and second divergence angles (α1, α1′, α2) are equal to or smaller than 40° preferably smaller than 30°, more preferably smaller than 20°; and wherein the first (33,33′) and second (34) planar light mixing elements are spaced apart from each other at least of a minimum unit depth (z1) measured along the direct light direction (15), configured to obtain uniform luminance of the direct light (13) which exits the first emitting surface (11) of the direct light generator (10).

The invention relates to the field of optical systems, and particularly discloses a radar system which is characterized in that a transmitting assembly transmits a path of signal light and a path of local oscillation light, the signal light enters a light guide assembly, the local oscillation light enters a receiving assembly, and the light guide assembly divides one path of the signal light into the receiving assembly and divides the other path of the signal light to be transmitted to the outside. And the light reflected by the outside is guided to enter the receiving assembly. The receiving assembly divides light returned from the outside into first polarization component light and second polarization component light, the first polarization component light and the second polarization component light are mixed with the local oscillation light to obtain a first measurement result and a second measurement result, and the signal light is divided into the first polarization component light and the second polarization component light to obtain a third measurement result and a fourth measurement result correspondingly. And a processing device obtains wind field information of the external atmosphere and obtains depolarization ratio information of the external atmosphere according to the measurement result. According to the invention, atmospheric wind field information and atmospheric depolarization ratio information can be detected at the same time, and the measurement accuracy can be improved.

The invention relates to a laser light source which comprises a blue laser light source assembly used for generating parallel linear polarization blue laser, a dichroic polarizing beam splitter, a quarter-wave plate, a reflecting piece and a wavelength converter, wherein an angle theta is formed between the polarization direction of the blue laser and the Y axis of an XOY plane; the blue laser is respectively reflected and transmitted by the dichroic polarizing beam splitter to form reflected blue light and transmitted blue light, and the reflected blue light is converged on the wavelength converter to generate excited yellow light; the transmitted blue light is subjected to wavelength conversion by the quarter-wave plate and then is reflected by the reflecting piece to pass through the quarter-wave plate again to be subjected to secondary wavelength conversion to form S polarized blue light, and the S polarized blue light and the excited yellow light are mixed to generate output white light; and the angle theta is set based on a preset light energy ratio of the S polarized blue light to the excited yellow light. The requirements of stable color temperature, simple and convenient manufacturing and energy loss reduction can be met at the same time.

A light emitting device (1) adapted for projecting a light beam (15) onto a target surface, the light emitting device (1) comprising a light engine (2) comprising a light source (3), a light mixing chamber (4), and an optical component (5) having a spherical shape with a curved light-receiving surface (51), where the light source (3) is arranged to, in operation, emit light towards a light exit window (41) of the at least one light mixing 5 chamber, the light exit window (41) of the at least one light mixing chamber (4) thereby acting as an extended light source with a curved light-emitting surface, where the optical component (5) is provided adjacent to the light exit window (41) of the light mixing chamber, and where the curved light emitting surface of the at least one light mixing chamber (4) is conformal to an the curved light-receiving surface (51) of the optical component (5) and 10 coincident with a focal surface (52) of the optical component (5).

A C4F7N mixed gas infrared spectrum multifunctional detection device comprises a gas pool adopting a plurality of detection chamber structures, an infrared light source and a photoelectric detection sensor are arranged on one side of each detection chamber, a replaceable optical filter is arranged on the other side of each detection chamber, and the light transmission wavelengths of the optical filters are different from one another; infrared light emitted by the infrared light source is directly irradiated to the gold-plated reflecting mirror, the gold-plated reflecting mirror reflects the infrared light to each light filter for filtering, so that the infrared light with specific wavelength is irradiated into the corresponding detection chamber, and the photoelectric detection sensor detects the intensity of the infrared light absorbed by the C4F7N mixed gas and converts a light intensity signal into an electric signal; and the infrared light comprises infrared light with the wavelength of 750-780 cm <-1> and infrared light with the wave bands corresponding to decomposition components of the C4F7N mixed gas, and the infrared light and the infrared light are respectively used for detecting the mixing ratio and the decomposition components of the C4F7N mixed gas. Mixing ratio detection and decomposition component detection of C4F7N mixed gas are achieved, multiple detection functions are integrated into one detection device, and the operation and detection efficiency of C4F7N mixed gas electrical equipment is improved.

An optical system (10) is disclosed comprising a light mixing rod (20) having an elongate body extending between a light entry window (22) and an opposing light exit window (24), a plurality of solid state lighting elements (30, 30′, 30″) arranged to couple their respective luminous outputs into the light mixing rod (20) through said light entry window (22), said respective luminous outputs including luminous outputs having different spectral compositions, respectively, and a lenslet plate (40) having an acceptance angle (ψ,ψ′) and comprising a first surface (41) comprising a first array of lenslets (42) and a second surface (43) opposing the first surface (41) comprising a second array of lenslets (44), each lenslet of the first array (42) being aligned with a corresponding lenslet of the second array (44), wherein the light mixing rod (20) has an aspect ratio such that some light rays (35) produced by the solid state lighting elements (30, 30′, 30″) are directly incident on said first surface (41), said directly incident light rays (35) having a maximum angle of incidence (Φ) on said first surface (41) not exceeding said acceptance angle. Also disclosed is a lighting device comprising such an optical system (10).

The invention relates to the field of optical systems, and specifically discloses a radar system. A transmitting component sends out one signal light and one local oscillator light, so that the signal light is incident on the light guide component, and the local oscillator light is incident on the receiving component, and the light guide component transmits the signal The light is split into one path to be incident on the receiving component, and another path is split to be emitted to the outside, and the light reflected from the outside is guided to be incident on the receiving component. The receiving component divides the light returned from the outside into the first polarization component light and the second polarization component light, and mixes them with the local oscillator light respectively to obtain the first measurement result and the second measurement result, and divides the signal light into the first polarization component light and the second polarization component light The two polarized light components obtain the third measurement result and the fourth measurement result correspondingly, and the processing device obtains the wind field information of the external atmosphere and the depolarization ratio information of the external atmosphere according to the measurement results. The invention can realize simultaneous detection of atmospheric wind field information and atmospheric depolarization ratio information, and can improve measurement accuracy.

The invention relates to a frequency-selecting 355nm ultraviolet laser in an optical fiber end face pumping Brewster angle cavity. A 808nm semiconductor laser generates pumping laser, the pumping laser is guided into a coupling head through a 808nm guiding out optical fiber to be focused, the focused 808nm pumping laser enters a plano-convex resonant cavity through a plano-convex front reflecting mirror, YVO4 crystal is stimulated to generate 1064nm laser, the 1064nm laser continuously simulates and oscillates in the plano-convex resonant cavity to generate mixed laser, the mixed laser exits an Brewster angle of third harmonic generation LBO crystal and is divided into light beams of different deflection angles, 355nm laser enters a power attenuator after being filtered by a substrate, the 355nm laser enters a beam expander after the power is adjusted, the 355nm laser is output through an output window after the spot diameter and an divergence angle are adjusted, and non-355nm useless light can enter a useless light recycling station through a deflecting prism. The frequency-selecting 355nm ultraviolet laser is ingenious in structure and reasonable in design, can keep temperatures of all modules in the laser constant and can stabilize the laser output power and the optical quality.

The invention provides a light emitting module (100) which comprises a light mixing chamber (101). The light mixing chamber comprises a base (102), at least one partly light transmissive side wall (103), an at least partly light transmissive-semi-reflective light exit window (104), a carrier (107), and at least one light emitting diode (105). The base (102) has a reflective inner surface (114). The at least one partly light transmissive side wall (103) extends from the base (102) towards the at least partly light transmissive, semi-reflective light exit window (104) which is arranged opposite to the base (102). The carrier (107) carries at least one light emitting diode (105) and is positioned at a distance (D1) from a nearest portion (108) of the at least one partly light transmissive side wall (103). The at least one light emitting diode (105) is arranged to emit source light (106) in a main direction different from 90 degrees with respect to the semi-reflective light exit window (104) and in the main direction away from the nearest portion (108) of the at least one partly light transmissive side wall (103) to enable subsequent mixing of the source light (106) within the mixing chamber (101) to generate mixed light (106′). The semi-reflective light exit window (104) and the at least one partly light transmissive side wall (103) are arranged to couple out source light (106) and mixed light (106′) as emitted light (106″). The mixing chamber has an inner mixing chamber width (W1) in the direction along the base (102) between the nearest portion (108) of the at least one partly light transmissive side wall (103) and an opposite portion (109) of the at least one partly light transmissive side wall (103) which is positioned opposite to the nearest portion (108) of the at least one partly light transmissive side wall (103). An inner mixing chamber height (H1) spaces the base (102) and the semi-reflective light exit window (104). The inner mixing chamber width (W1) and the inner mixing chamber height (H1) have an aspect ratio in the range of 4 to 15. The semi-reflective light exit window (104) has a reflectivity in the range from 30 to 80% for source light (106) and mixed light (106′). The distance (D1) from the at least one light emitting diode (105) to the nearest portion (108) of the at least one partly light transmissive side wall (103) is in the range from 5 to 30% of the inner mixing chamber width (W1).

The invention provides a low-temperature co-fired ceramic material emitting white light and a preparation method thereof. The ceramic material comprises the following components in percentage by mol: 10 to 20 percent of CaO, 20 to 30 percent of B2O3, 50 to 60 percent of SiO2, and 1 to 9 percent of optical activating agent ions. The invention also relates to the preparation method of the material, namely, a sol-gel method for preparing the low-temperature co-fired ceramic material emitting white light. The invention has the advantages that: 1, the preparation process is simple and advanced, the sintering temperature is low by adopting the Sol-gel method and is between 800 DEG C and 900 DEG C, the sintering shrink rate at the temperature is controllable between 13 percent and 17 percent, and a glass ceramic material has a flat and smooth surface, as well as higher strength; 2, the dielectric constant is adjustable between 4(1MHz) and 6 (1MHz), and the coefficient of dielectric loss is lower than 0.002; 3, the light emission intensity is high, the material can emit yellow and blue light under activation of ultraviolet light with the wavelength of between 320nm and 410nm, the white light obtained by mixing the blue light and the yellow light can be used for illuminating and displaying; and 4, based on the advantages, the low-temperature co-fired ceramic material can be applied to the fields of white light LED (Light Emitting Diode) lamps, integrated ceramic substrates and other electronic devices and semiconductors, as well as microelectronic packaging materials.

The invention discloses a multi-satellite cooperative electro-optical hybrid communication method based on Rydberg atoms and photo-generated microwaves, and the method comprises the steps: preparing a Rydberg state through the interaction of a laser light field and an alkali metal energy level, and converting a wireless communication signal into a laser communication signal through the energy level splitting and spectrum change generated by the Rydberg atoms under the action of an electromagnetic field; a laser communication signal is used for pumping a nonlinear optical microcavity or a one-way carrier photodiode to generate microwave oscillation, and the laser communication signal is converted into a wireless communication signal; communication carriers are reasonably selected according to satellite-ground and inter-satellite communication link conditions and service requirements, and efficient multi-satellite cooperative electro-optical hybrid communication is achieved. According to the invention, the intercommunication and interconnection steps of the heterogeneous communication system can be effectively reduced, and an important solution is provided for comprehensively improving the global coverage satellite communication network performance.

The invention discloses a 100MHz high repetition frequency, 1ns narrow pulse width narrow line width laser mixing amplifying device and method. The 100MHz high repetition frequency, 1ns narrow pulse width narrow line width laser mixing amplifying device comprises a single-frequency continuous optical fiber laser device, a high-speed light intensity modulator, a super-high frequency random wave generator, an optical isolator, an optical fiber amplifier, a polarization isolator, a collimator, a coupling lens and an LD double-end-surface pump solid laser amplifier. The single-frequency continuous optical fiber laser device, the high-speed light intensity modulator, the super-high frequency random wave generator, the optical isolator, the optical fiber amplifier, the polarization isolator, the collimator and the coupling lens are sequentially connected; the coupling lens and a two-color coupling mirror on the LED double-end-surface solid laser amplifier are connected; the super-high frequency random wave generator is connected with the high-speed light intensity modulator. According to the 100MHz high repetition frequency, 1ns narrow pulse width narrow line width laser mixing amplifying device, a small-signal single-frequency optical fiber laser device can be modulated through the high-speed modulator; when high power is provided, the solid laser amplifier is used for amplifying, and therefore the problem that the amplifier is damaged under a high power condition cased by easily generated stimulated scattering and spontaneous amplification radiating effect is avoided.

A laser radar device includes: a light source; a projection light scanner that scans one part of light split off from emission light of the light source, and that generates transmission light for radiating onto a target object; an image forming section that forms plural respective reception lights of the transmission light reflected by respective locations of the target object into an image on a single flat plane as plural image-formation points; an optical receiver that is disposed at the plural image-formation points, and that includes plural unit optical reception sections for mixing each of the plural reception lights together with a reference light and performing optical heterodyne detection; and a reference light scanner that scans or distributes another light split off from the emission light from the light source, and that generates the reference light for radiating onto each of plural of the unit optical reception sections.

A continuous wave (CW) heterodyne lidar (LIDAR) air velocity sensor system comprising: a first light emitting structure configured to transmit signal light in a first direction in space; a second light emitting structure configured to generate Local oscillator light, the wavelength of the local oscillator light is different from the wavelength of the signal light by a predetermined wavelength; the receiver is configured to receive light from the first direction in space; and the first optical mixer is used to combine the received light Mix with the LO light.