115 results about "Beam collimation" patented technology

The invention provides a cavity adjusting method and device for a laser gyroscope resonant cavity, and the method comprises the following steps: building a light beam loop: horizontally placing a resonant cavity substrate on a supporting seat, and forming the light beam loop with two plane reflectors and two spherical reflectors; light beam introduction: starting a sweep frequency laser assembly, and enabling the reference light beam to enter a resonant cavity light path after passing through a light beam collimation system; light spot form monitoring and coarse adjustment: after a light beam emitted by the resonant cavity is collected by an image collector, the main control computer analyzes the light spot form and judges the imbalance state, evaluation information is fed back to the control system, the control system adjusts the inclination amount of the horizontal dimension and the pitching dimension of the light beam in the light beam collimation system according to the feedback information, and the light spot form is obtained. And the light spot is located at the center of the cavity mirror to finish coarse adjustment of the cavity. According to the method, coarse cavity adjustment can be completed without depending on a complex optical cavity technology, the cavity adjustment time is greatly shortened, the overall operation is simple, and the cavity adjustment efficiency is improved.

The invention discloses an ultra-wide thin-wall tunnel roof deformation monitoring device based on laser ranging, and relates to the technical field of laser measurement, the ultra-wide thin-wall tunnel roof deformation monitoring device comprises an industrial camera and a mounting seat, a laser is fixedly mounted on the mounting seat, a mounting bracket is mounted at the bottom of the mounting seat, and a protective shell is fixedly mounted on the mounting seat. A light beam collimator is fixedly installed on the laser device, and a beam splitting assembly is fixedly installed in the protective shell and used for equally dividing a light source emitted by the laser device into two laser beams. The tunnel section deformation monitoring method has the advantages that high-precision and high-efficiency deformation monitoring can be performed on the tunnel section, the problems of time desynchrony and optical distortion existing in a traditional method are effectively solved, and meanwhile, the adaptability and data reliability in a severe environment are remarkably improved; and reliable technical means and equipment support are provided for structural health assessment of the ultra-wide thin-wall tunnel top arch.

The invention discloses a multi-wavelength same-viewing-direction laser radar telescope system, and belongs to the technical field of laser radar detection. The system comprises a paraboloid single primary mirror which focuses a specific wavelength optical signal received by a telescope to a focus through a primary mirror paraboloid; the replaceable small hole is fixedly formed in the focus position of the paraboloid single primary mirror; the collimating lens group is used for collimating the telescope focusing light beam penetrating through the replaceable small hole to form parallel light beams; the n dichroic mirror groups are used for dividing the parallel light beams into reflected parallel light beams and transmitted parallel light beams; and the plurality of focusing lens group assemblies are used for focusing the parallel light beams split by the dichroic mirror to the focal points of the focusing lens group assemblies, and the number of the plurality of focusing lens group assemblies is n + 1. Multi-wavelength receiving in the same direction can be achieved, light background noise is suppressed by the secondary diaphragm, view fields of different wavelengths are controlled respectively, the size is small, the light collecting efficiency is high, and noise is low.

The embodiment of the invention provides a ray beam collimation system, and relates to the technical field of medical equipment. The ray beam collimation system comprises a primary collimator and a multi-leaf collimator. The primary collimator is provided with a through hole with a fixed shape and size, and the through hole is matched with the multi-leaf collimator in shape and size. And the primary collimator is positioned below the ray source and above the multi-leaf collimator. The multi-blade collimator comprises at least two blade groups composed of a plurality of blades, the tail end of each blade is provided with a concave-convex part, the concave-convex part comprises a plurality of first protrusions arranged at intervals in the first direction, a first recess is formed between every two adjacent first protrusions, the at least two blade groups comprise two blades opposite in the second direction, and the first protrusions are arranged at intervals in the first direction. The first protrusion of one of the two opposite blades is used for being connected with the first recess of the other blade in an inserted mode. The ray beam collimation system provided by the embodiment of the invention has the benefits that leakage rays between the tail ends of the blades are shielded, and the irradiation space of a patient in radiotherapy is increased.

The invention discloses a bending endoscopic imaging method and system based on a few-mode optical fiber, and belongs to the technical field of optical fiber imaging. According to the method, an MNIST handwritten digital image is loaded through a digital micromirror device (DMD), a speckle pattern is generated through few-mode optical fiber transmission, image restoration in a bending state is achieved through a deep learning model, and reconstruction effects under different bending degrees are quantized through a Dice coefficient. The system comprises a light beam collimation module, a pattern loading module, an image transmission module and an image acquisition-processing module. The image transmission module adopts a step refractive index few-mode optical fiber, and mode coupling caused by bending is inhibited by increasing the effective refractive index difference between modes; and the image acquisition-processing module is combined with a shallow U-shaped convolutional neural network to reconstruct a speckle pattern acquired by the CCD camera. While miniaturization of the probe is ensured, the imaging quality in a bending environment is remarkably improved, and the probe is suitable for miniaturized high-resolution imaging scenes such as medical endoscopes and the like.

The invention discloses a compact, large-aperture and variable-focal-length collimator system, which comprises a Cassegrain reflector group, a correction lens group and a thermal compensation piece, the Cassegrain reflector group and the correction lens group are in optical conjugate design; the thermal compensation part is arranged in the Cassegrain reflector group so as to compensate the thermal expansion effect of the Cassegrain reflector group; the correction lens group is located on one side, close to the focal plane, of the Cassegrain reflector group, and the correction lens group is detachably connected with the Cassegrain reflector group; the Cassegrain reflector group comprises a primary mirror and a secondary mirror which are coaxially arranged; the correction lens group is used for collimating the short-focal-length parallel light beams output by the Cassegrain reflector group into long-focal-length parallel light beams; the correction lens group comprises one or more optical lenses, and the correction lens group is configured to be assembled with optical lenses with different focal powers and different numbers so as to realize focal length switching of the collimator system. Therefore, not only is the light beam collimation precision ensured, but also the collimator system is compact in structure and can quickly change the focal length.

The application belongs to the technical field of optical switching, and particularly relates to an LCOS-based OCS optical switch, which comprises a collimating and polarizing module, a first LCOS, an achromatic Fourier transform lens group and a second LCOS. The collimating and polarizing module collimates, separates and converts a first light beam to obtain a first group of P light beams containing two P light beams. The first LCOS modulates and deflects the first group of P light beams to obtain a second group of P light beams containing a plurality of P light beams emitted at different deflection angles. The achromatic Fourier transform lens group deflects and transforms the waist of the second group of P light beams to obtain a third group of P light beams. The second LCOS modulates and deflects the third group of P light beams to obtain a fourth group of P light beams containing a plurality of P light beams emitted at the same deflection angle. The polarizing and focusing module converts, combines and focuses the fourth group of P light beams into a second light beam composed of S light and P light. The first light beam enters the OCS input port, and the second light beam is output from the OCS output port, so as to realize an optical switching technical scheme which is less affected by external vibration, has good stability and low implementation cost.

The invention relates to the field of light beam control, in particular to a light beam collimation control method and system of a VCSEL light source. The method comprises the following steps: detecting an initial emergent light beam of a VCSEL light source, carrying out periodic tracking sampling, and determining a light beam structure response characteristic; carrying out region offset calculation one by one according to light beam structure response characteristics to obtain offset compensation parameters of different partitions; adjusting the driving current of the light emitting unit based on the offset compensation parameter to obtain a current adjustment parameter; applying the current adjustment parameter to a VCSEL array in real time, and performing collimation stability evaluation to obtain a stability coefficient; and performing evaluation based on the stability coefficient, and when it is judged that the VCSEL light beam enters a stable collimation state, recording the current adjustment parameter as a collimation adjustment parameter, and entering a low-disturbance maintenance mode. According to the invention, the driving current parameters of the light source are precisely regulated and controlled, so that the light beam collimation precision, stability and anti-disturbance capability are improved.

A quantitative phase contrast imaging system comprises a light source configured to generate light and to direct the light to a sample, wherein the light comprises nonlinearly polarized light; a first lens configured to receive light from the sample; a phase filter, wherein the first lens is configured to focus the light from the sample onto the phase filter, and the phase filter is configured to modulate multiple components of the nonlinearly polarized light simultaneously (e.g., geometric phase interferometry); a second lens configured to receive light from the phase filter; and a polarized camera, wherein the second lens is configured to collimate the light beam from the phase filter to the polarized camera and the polarized camera is configured to image the sample in response to the light from the phase filter. In absence of the second lens, the camera can be placed at the image plane.

The application discloses a multi-pass disk laser amplifier, which comprises a near end and a far end, a pump laser beam, a seed laser beam, a first parabolic mirror, a second parabolic mirror, a laser gain medium, a first deflection optical prism group and a second deflection optical prism group, wherein the laser gain medium comprises a medium reflection surface; the pump laser beam located at the near end is aligned to the first parabolic mirror located at the far end for incidence through a first beam collimator; and the seed laser beam located at the near end is aligned to the second parabolic mirror located at the far end for incidence after passing through a second beam collimator. Compared with a conventional multi-pass disk laser amplifier, the application has a simpler structure, a shorter amplification optical path, a more compact volume and higher system stability. Furthermore, by changing the structure of the design prism of the pump light path, 12-pass, 24-pass, 36-pass, 48-pass and other multi-pass amplifications can be realized.

There are provided: a light source to generate a laser beam; an optical modulator to superimpose a communication signal on the laser beam; an OHPA to amplify the laser beam; a collimator including a fiber connector and a collimator lens to convert the laser beam amplified into spatial light, and emit the spatial light; an optical telescope to enlarge a beam width of the spatial light and emit the spatial light to a spatial transmission path; a drive mechanism capable of adjusting a focal length of the collimator lens; and a drive controller to determine a drive amount of the drive mechanism in such a manner that a product of a free space loss calculated from a distance between the spatial optical communication transceiver and a spatial optical communication transceiver and a transmission gain determined by a beam spread angle of the spatial light is constant.

Disclosed is a free space optical communication terminal comprising: a first arm interfacing a first port of a beam splitter and comprising a first component configured to emit a divergent first emitted beam and / or utilize a first received beam; a second arm interfacing the second port of the beam splitter and including a second component configured to emit a divergent second transmit beam and / or utilize a second receive beam; and a third arm interfacing the third port of the beam splitter and including a pointing unit configured to direct the first transmitted beam and / or the second transmitted beam to the target and / or to direct the first received beam and / or the second received beam received from the target. The third arm includes an optical element for collimating the transmit beam to provide a collimated transmit beam to the pointing unit and focusing the receive beam to provide a converged beam to the first / second arm. The invention further discloses a light beam guiding method and a carrying tool.

A light detection and ranging (LIDAR) system includes a beam collimator, a plurality of first lenses, a plurality of tunable lenses, and one or more optical sources to generate a plurality of optical beams. Each tunable lens may be disposed adjacent a respective one of the plurality of first lenses such that the respective one of the plurality of first lenses is between the tunable lens and the beam collimator. Each of the plurality of optical beams may pass through one of the tunable lenses and one of the first lenses towards the beam collimator. Each of the plurality of tunable lenses may be separately controllable by selectively applying voltage to the tunable lens to adjust a focal length of the tunable lens to compensate for a variation in focus positions of the plurality of first lenses.

The invention relates to a miniature brain imaging device for two-color fluorescence and an imaging method thereof, and relates to the technical field of biomedical imaging device.The miniature brain imaging device comprises a shell and a lens end cover which are connected, and an imaging light path and an illumination light path are sequentially arranged in the shell and the lens end cover along an imaging optical axis; the imaging light path comprises a lens group, a first dichroscope, a first optical filter and a fifth lens which are arranged in sequence, the lens group is composed of a first lens, a second lens, a third lens and a fourth lens which are arranged in sequence, and the illumination light path comprises a first light source, a second light source, a second dichroscope and a sixth lens. The first light source and the second light source are combined through the second dichroscope to form a collimated light beam, and the collimated light beam is shaped through the sixth lens and then projected to the object plane through the first dichroscope. The application has the effects that different types of neural signals or cell populations can be monitored at the same time, different states or functional modules of neurons can be distinguished, and the resolution and accuracy of data can be improved.

The LSP broadband light source may include a pump source configured to generate a pump beam and one or more collimating optical elements configured to collimate the pump beam into a collimated pump beam. The light source may include one or more focusing optical elements and a beamsplitter located at a conjugate plane between the one or more collimating optical elements and the one or more focusing optical elements. The light source may include a gas containment structure. The beamsplitter may be configured to split the collimated pump beam into a set of pump beamlets, wherein the one or more focusing optical elements are configured to focus the set of pump beamlets to a set of focus positions within the gas to generate multiple plasma regions at the different focus positions.

The utility model discloses a green light strong light control device based on an optical fiber conduction mode, which comprises a green light source module, a light beam collimation and beam expansion module, a heat dissipation module and a driver, and a connection conduction medium between the green light source and the light beam collimation and beam expansion module is an optical fiber; the light beam collimating and expanding module is used for expanding and collimating the light beams emitted by the green light source module into energy-gathered high-power-density light beams, and meanwhile, a high-brightness optical fiber coupling and homogenizing device in the light beam collimating and expanding module performs high-uniformity scattering on the light beams; the driver is used for carrying out continuous constant current driving and stroboscopic modulation control on the green light source module; the heat dissipation module is used for conducting heat dissipation on the green light source module. The overall structural design is simple, the cost can be effectively controlled, and deployment, installation and operation are convenient; in addition, the optical fiber is adopted as a conducting medium, and high reliability is achieved; and meanwhile, a Morse code sending function is realized.

This invention discloses a multi-beam laser interference lithography system and method for periodic three-dimensional micro / nano structures. The system includes a laser, a diffraction element, a 4F collimation-beam control-focusing module, and a piezoelectric stick-slip precision motion system. The laser is perpendicularly incident on the diffraction element, which diffracts the beam into N sub-beams and one central beam distributed symmetrically. The 4F collimation-beam control-focusing module includes a first Fourier transform lens, a custom beam control frame, and a second inverse Fourier transform lens. The first Fourier transform lens collimates the umbrella-shaped N+1 beam generated by the diffraction element into a parallel N+1 beam. The custom beam control frame includes a half-wave plate and a polarizer along the optical axis. The second inverse Fourier transform lens focuses the parallel N+1 beams onto the same point on the sample. The lithography of the sample is completed by coordinating the spatial interference light field with the movement of the piezoelectric stick-slip precision motion system.

The invention discloses equipment and a method for measuring the length of a high-speed rotating blade. The method comprises the following steps: acquiring a collimated Gaussian beam through a light source collimation module; converting the collimated Gaussian beam into a flat-topped beam with uniformly distributed intensity through a collimation and homogenization converter; a blade tip detection light path of the to-be-detected workpiece is obtained through a light beam reflection module according to the symmetrically arranged light beam reflection ends; the blade tip detection light path comprises a light path of incident light obtained by carrying out light path direction conversion on the flat-topped light beam; performing straight edge diffraction on the blade tip edge of the to-be-detected workpiece through the incident light to obtain a light path of diffracted light containing blade tip size information of the to-be-detected workpiece; a light beam receiving and demodulating end is used for receiving and demodulating diffraction fringe intensity distribution of diffraction light containing blade tip size information so as to reconstruct blade length parameters of a to-be-detected workpiece. According to the invention, the problems of poor light beam collimation, poor light spot uniformity and poor blade tip measurement precision existing in the actual use of the existing measuring instrument are solved.

The invention discloses a semiconductor stack laser and a laser generating method and an assembling method thereof, and belongs to the field of lasers. According to the technical scheme, the semiconductor stacked array laser comprises a stacked array and a plurality of laser bars installed on the side of the stacked array in a stacked mode, a laser chip is arranged at the front end of a heat sink of each laser bar, a fast axis collimating lens and a reflecting mirror are sequentially arranged along an output light path, the inclined face of each reflecting mirror is obliquely opposite to the corresponding laser chip, and a VBG grating is arranged in front of the inclined face of each reflecting mirror. And the two are oppositely arranged in the reflection direction through the inclined surface. According to the design, most of laser is directly output through the vertical plane of the reflector, only a small amount of laser is reflected to the VBG grating for detection and adjustment, VBG absorption energy is greatly reduced, wavelength lock losing caused by temperature drift is avoided, stable wave locking precision during high-power operation is guaranteed, meanwhile, the fast axis collimating lens is matched with the reflector, the light beam collimating effect is improved, and the light quality is improved. And the beam quality of the output laser is optimized.

The application discloses a wireless laser charging method and system based on a UAV, relates to the technical field of UAV charging, and comprises the following steps: collimating divergent light beams into parallel light beams through a laser emitter device and expanding the diameter of the input light beams; converting the laser charging signals into electric energy through a photovoltaic array, and charging the UAV through a constant current circuit; monitoring the current and voltage in the charging process in real time through the charging control, and judging whether the charging current needs to be adjusted according to the monitored data. The application charges the UAV wirelessly without connecting a power line, judges the central position of the battery panel light spot by comparing the intensity of the laser light source and the output voltage of the photoresistor, thereby realizing accurate control of the charging process, avoiding energy waste and overcharging of the battery in the charging process, charging the UAV through a constant current circuit, avoiding the battery short circuit hidden danger caused by overcharging, and thereby ensuring the stability and safety of the UAV charging.

The present invention relates to a DC electric field sensing system with a rotating structure, so as to achieve accurately measuring the DC electric field. The system includes a laser, a rotating structure, and a detector, wherein the rotating structure includes a single-mode fiber-optic slip ring, a collimator lens, a polarizer, a quarter-wave plate, a crystal, and a multi-mode fiber-optic slip ring. Experimental results show that the technical solution has advantages such as fast response, and strong resistance to electromagnetic interference, and makes it possible to inhibit beam deviation, achieve beam collimation, and enable high-precision measurement, by using the rotating structure and the fiber-optic slip ring.

The invention relates to the field of photonic crystal manufacturing, in particular to a multi-beam laser holography complex period photonic crystal manufacturing system and method, and the system is provided with a laser, a multi-beam generation element, a beam collimation element, a displacement table, a spatial light modulator, a focusing lens, a photoresist plate, a multi-axis displacement table and an upper computer. The upper computer is used for controlling the displacement table, the spatial light modulator and the multi-axis displacement table, laser is emitted from the laser device and passes through the multi-beam generation element in the normal direction to generate multiple beams of coherent light, the multiple beams of coherent light are collimated into parallel light through the beam collimation element, and the parallel light is transmitted to the spatial light modulator through the multi-axis displacement table. A spatial light modulator is controlled by an upper computer to change the phase and polarization state of each parallel light beam, and then each parallel light beam is converged to a photoresist plate through a focusing lens. The large-area complex period photonic crystal can be repeatedly prepared on a large scale under modularization, high integration and fine control, and the method plays an important role in the optical fields of optical integration, optical communication and the like.

A fiber optic spectrometer, belonging to the field of optical instruments, includes a beam collimating unit positioned perpendicular to the emission direction of the fiber optic light. Behind the collimating unit, a beam deflector is tilted, and below the deflector, a projection grating is positioned. The transmission grating forms a 45° angle with the line parallel to the central wavelength principal ray of the beam collimating unit. A pair of mirrors with different tilt angles are positioned on the light emission side of the transmission grating, and a beam focusing unit is positioned on the light incident side of the transmission grating. The emitted beam from the beam focusing unit is parallel to and opposite to the central wavelength principal ray of the beam collimating unit. A detector array is positioned on the fiber emission side of the beam focusing unit. This invention uses a single projection grating, achieving two symmetrical reflections through the mirrors, and its optical path dimensions are more compact than the aforementioned dual-grating structure, thus achieving the spectral resolution effect of a dual-grating.

The present disclosure discloses an adaptive beam collimation and quality optimization system and method based on spot gridding, which belongs to the field of laser transmission. In the adaptive beam collimation and quality optimization system, a first optical reflector is installed at the front end of a three-module optical mirror frame, and an incident laser beam is reflected by a first optical reflector to reach a second optical reflector, and then the beam is output after being reflected by the second optical reflector again; an image collector collects a spot image on the second optical reflector and stores it to a computer; a computer processes the collected spot image, extracts a real-time relative position of the spot on the second optical reflector, compares the real-time relative position information with a pre-calibrated position to obtain the offset of the spot, correct the offset of the reflected beam, and feedback the intensity information of the adjacent small unit spot to a spot unit piezoelectric ceramic array module controller to correct the distortion of the reflected beam. The present disclosure can realize adaptive beam collimation and spot optimization without manual guarding and operation, and is applicable to the collimation and spot optimization of large-diameter beam transmission.

The application relates to the technical field of optics, in particular to a low-crosstalk channel modulation interference polarization spectrum detection method and system, which comprises a half-field telescope module, a phase modulation module, an interference modulation module and a detection module; the half-field telescope module is used for collimating an input target light beam in a lower half field, the target light beam is parallelly transmitted to the phase modulation module according to a set range, a compound polarization beam splitter prism group in the phase modulation module performs a light splitting operation based on the target light beam output by the half-field telescope module, two parallel polarization lights are emitted, and independent phase modulation of the two lights is ensured; the interference modulation module is used for performing light splitting modulation according to the two polarization lights, ensuring that the two polarization light beams after modulation interfere and are transmitted to the detection module to be imaged. The system improves the detection precision of narrow-band polarization spectrum or polarization spectrum with obvious narrow-band wave peaks and narrow-band absorption peaks, and has strong polarization spectrum detection capability and wide application range.

The present application relates to a kind of polarization measurement error evaluation and decoupling system, evaluation method and decoupling method, in particular to a kind of polarization measurement error evaluation and decoupling system, evaluation method and decoupling method of polarization detection optical equipment, solve the problem that prior art lacks the evaluation method and decoupling method of coupled polarization measurement error introduced by instrument polarization and imaging quality of polarization detection optical equipment.The system includes test beam generation module, analysis unit and information acquisition computer;Test beam generation module includes laser light source, beam collimator, polarizer, beam splitter and the polarization distribution modulation element of light arranged on the reflected light path of beam splitter in order along optical path;Analysis unit is arranged on the output light path of the polarization detection optical equipment to be measured, for acquiring the detection signal outputted therefrom, and extract the required information therefrom, and transmit to information acquisition computer;Information acquisition computer is used to calculate polarization measurement error and decouple coupled polarization measurement error.

The pulse timing adjustable laser generating device of the present application comprises a timing controller, a driving power supply, a pump source, a beam collimation and shaping lens group, a beam combiner, a coupling lens group, a laser cavity mirror, a laser medium, a Q switch and a laser output coupling mirror. The multiple output ports of the timing controller are connected with the input ports of the multiple driving power supplies for generating multiple trigger signals and sending each trigger signal to the corresponding driving power supply, and each driving power supply is connected with a pump source. The present application has the advantages of compact structure, easy integration and timing programmable control pulse train working mode. Through increasing the time and sequence adjustment function of the electric modulation signal, multiple different wavelength pump sources or multiple same wavelength pump sources are pulsed pumped in time, multiple laser pulse sequences are generated in the laser cavity using the Q switching device, the problem that the pulse train laser timing is difficult to accurately control is broken through, and the application field of the pulse train laser is effectively expanded.

This invention discloses a fixture and method for laser interferometer beam collimation, comprising: a worktable, a workpiece stage, a vacuum cavity, a laser interferometry measuring device, and an adjustment device. The vacuum cavity is disposed on the worktable, the workpiece stage is disposed within the vacuum cavity, and the laser interferometry measuring device is fixedly disposed on the worktable for high-precision displacement measurement of the workpiece stage within the vacuum cavity. The adjustment device is movably disposed on the worktable for optical path collimation. This invention utilizes a universal fixture to complete the collimation of all optical paths, significantly reducing costs, improving the versatility and operability of the collimation method, and facilitating its widespread adoption.

The invention provides a two-channel achromatic confocal laser microendoscope system, an imaging method and a medium, and the method comprises the steps: a light beam collimation and beam expansion module emits two lasers with different wavelengths, the two lasers are combined through an optical fiber coupler, and the combined lasers enter a light beam scanning relay module; the light beam scanning relay module transmits the scanned laser to the light beam coupling image transmission module; the light beam coupling image transmission module focuses the laser beam entering the coupling objective lens into an optical fiber bundle, focuses the laser beam on a sample, and excites a fluorescence signal emitted by the sample to be reflected to the fluorescence signal acquisition module; the fluorescence signals sequentially pass through a double-band narrow-band color filter and a dichroscope, the dichroscope separates the two paths of fluorescence signals, and the separated two paths of fluorescence signals are captured by a photomultiplier and converted into electric signals after respectively passing through a corresponding collecting lens and a pinhole; a two-dimensional image is reconstructed through a computer system; two kinds of fluorescent molecules are excited to emit light at the same time and displayed in one image in an overlapped mode, and high-quality image collection is guaranteed.

The application discloses a scintillator light beam collimation system, and relates to the field of light beam shaping. The system comprises an ellipsoidal reflector, a free-form surface collimation reflector cup and a free-form surface collimation lens. The scintillator is arranged at a first focal point of the ellipsoidal reflector. The ellipsoidal reflector is used for converging light rays emitted by the side of the scintillator at a second focal point of the ellipsoidal reflector. The free-form surface collimation reflector cup is connected with the ellipsoidal reflector. The free-form surface collimation reflector cup is used for collimating light emitted by the scintillator and exceeding a demarcation angle and light converging by the ellipsoidal reflector. The free-form surface collimation lens is used for collimating light emitted by the scintillator and smaller than the demarcation angle and light converging by the ellipsoidal reflector. The application can improve the light beam collimation effect of the scintillator.