33 results about "Double-clad fiber" patented technology

The invention discloses a double-core optical fiber integrated MZ interferometer based on thermal diffusion. The interferometer is mainly characterized in that a core structure of the interferometer is formed by sequentially welding an input optical fiber (1), a first double-cladding transition optical fiber (2), a double-core optical fiber (3), a second double-cladding transition optical fiber (4) and an output optical fiber (5). Thermal diffusion treatment is performed by long-term high-temperature heating in the welding regions (A) and (B). The thermal diffusion treatment enables fiber core doping elements to be diffused, a transition area is formed in the double-clad optical fiber, the coupling efficiency between the single-mode optical fiber and the double-core optical fiber is remarkably improved, and compared with a traditional tapering structure, the thermal diffusion area is higher in mechanical strength. The interferometer device is compact in structure, high in integration level and excellent in interference contrast, can realize high-precision phase sensitive sensing, is suitable for distributed measurement of physical quantities such as temperature, bending and refractive index, and can be widely applied to optical fiber sensing.

The invention provides a heterogeneous dual-core optical fiber SPR (Surface Plasmon Resonance) microfluidic chip system for biochemical detection. The system is characterized by comprising a heterogeneous dual-core optical fiber 1, a dual-core optical fiber movable connector 2, a dual-core optical fiber SPR probe 3, a microfluidic chip 4, a dual-core optical fiber fan-in and fan-out device 5, a double-clad optical fiber 6, a large-core-diameter optical fiber 7, a spectrograph 8, a light source 9 and the like, wherein the double-core optical fiber 1 comprises a middle single-mode fiber core and a biased multi-mode fiber core, the end face of the single-mode fiber core is subjected to inclined grinding and plated with a gold film for exciting the surface plasma resonance effect, the end face of the multi-mode fiber core collects SPR reflected light signals through a secondary reflection inclined plane, and the double-core optical fiber SPR probe 3 is embedded into the micro-flow chip 4. The device has the advantages of high sensitivity, low loss and multi-channel detection, and can be widely applied to the fields of biochemical detection, environmental monitoring, precision medical treatment and the like.

The present invention discloses a fiber-optic ultrasonic endoscope with integrated lateral transmission and reception and a preparation method, which belongs to the field of ultrasonic endoscopic imaging. It comprises a double-clad optical fiber, an excitation film, a dielectric mirror, and a sensing film. By etching part of the inner cladding of the optical fiber into a concave spherical surface and coating it with an excitation film, the excitation light transmitted in the inner cladding is absorbed and focused ultrasonic waves transmitted laterally are excited. By etching part of the inner cladding and the core of the optical fiber and preparing it into a Fabry-Perot (F-P) cavity. When the ultrasonic signal transmitted laterally into the ultrasonic endoscope acts on the sensing film of the cavity, the effective refractive index of the sensing film and the F-P cavity length change, and the signal light in the core demodulates this change to complete the detection of ultrasonic waves. The present invention etches the inner cladding and coats it with an excitation film to achieve the excitation of laterally focused ultrasonic waves, etches an F-P cavity on the side of the optical fiber to achieve the lateral detection of ultrasonic waves, and thus forms a fiber-optic ultrasonic endoscope with integrated lateral transmission and reception.

The invention relates to the technical field of medical apparatus and instruments, and discloses an ultra-pulse thulium fiber laser therapy apparatus, which comprises a laser, a coupler, a lithotripsy energy transmission optical fiber, a thulium fiber laser head, an electrical device, a mainboard, an air cooling device and an equipment case, the laser is of an all-fiber structure and outputs 1940-nanometer near-infrared laser, the 1940-nanometer near-infrared laser is transmitted to the thulium fiber laser head through the thulium-doped double-clad fiber, and a collimating lens set is arranged at the light emitting end of the laser head and used for shaping the laser into collimated light beams. An aspheric focusing lens and an optical fiber clamping mechanism are arranged in the coupler, and the coupler is used for focusing the collimated light beam into the lithotripsy energy transmission optical fiber; the lithotripsy energy transmission optical fiber is a multimode quartz optical fiber, the end face is polished and plated with an anti-reflection film, one end is connected with the coupler through an FC / APC interface, and the other end is connected with an external replaceable treatment handle; and the electrical device is electrically connected with the mainboard. According to the invention, efficient and intelligent heat dissipation management is realized, and the energy transmission efficiency and the output stability are improved.

The application provides a conical double-clad fiber probe integrated with photoacoustic excitation and detection, which integrates pump light excitation and detection light sensing through a conical double-clad fiber, integrates functions such as photoacoustic excitation, gas-light interaction and interference detection in a micro probe, effectively simplifies the device structure, reduces the volume, and significantly improves the integration and compactness. At the same time, the conical part of the conical double-clad fiber can realize lateral diffusion of pump light, so that it can fully act on the measured gas in the closed gas chamber without additional configuration of optical components such as mirrors, and the problem of weak photoacoustic signal in a small space is improved. In addition, the application uses a fiber Fabry-Perot interference structure to complete vibration detection with a polyimide diaphragm, replacing the traditional electronic detector, having excellent anti-electromagnetic interference capability, and can accurately identify weak vibration signals, effectively improving the sensitivity and operation stability of gas detection.

The invention discloses an all-fiber integrated detection ablation diagnosis and treatment instrument and a preparation method, and belongs to the field of fiber ultrasonic sensors and laser ablation devices. Comprising a double-clad optical fiber, a dielectric film, a sensing cavity and a micro-focusing cone. The double-clad optical fiber is used for transmission of probe light and ablation laser, the dielectric film and the sensing cavity jointly form a Fabry-Perot (FP) cavity to sense ultrasonic signals, and the micro-focusing cone provides an ultrasonic focusing effect. The problems that an existing optical fiber detection ablation device depends on multiple fibers and is complex in structure are solved, and the problems that an existing hollow cantilever structure optical fiber ultrasonic sensor is low in sensitivity and low in frequency band are solved.

A cladding light stripper and a manufacturing method therefor, and an optical fiber laser, relating to the technical field of cladding light strippers. The cladding light stripper (100) comprises a double-clad optical fiber assembly (1) and triple-clad bare fibers (2); the double-clad optical fiber assembly (1) comprises two sections of double-clad optical fibers (11), each double-clad optical fiber (11) comprises a double-clad bare fiber (111) and a coating layer (112) which are concentrically arranged in sequence from inside to outside, and the double-clad bare fiber (111) extends out of the coating layer (112); there are multiple sections of triple-clad bare fibers (2), the multiple sections of triple-clad bare fibers (2) are sequentially welded to form a main body (3), the two sections of double-clad optical fibers (11) are respectively welded to two ends of the main body (3) by means of the double-clad bare fibers (111), and a stripper is formed on the main body (3). The cladding light stripper (100) can be constructed from multiple sections of triple-clad bare fibers (2) while preserving the original advantages of the double-clad optical fibers (11) and the triple-clad bare fibers (2); this design can avoid the formation of local hot spots in any section of triple-clad bare fiber (2) due to prolonged high-power operation, thereby significantly improving the cladding light stripping ability of the cladding light stripper (100).

According to the surface plasmon resonance (SPR)-based three-parameter optical fiber sensor and the preparation method thereof provided by the invention, the Bragg grating (FBG) and the long-period grating (LPFG) are utilized, so that synchronous measurement of temperature, stress and salinity can be realized in the same sensor structure, and the sensor has the advantages of high sensitivity, quick response, compact structure and the like. According to the structural design of the sensor, the problem of cross sensitivity between temperature and stress can be effectively solved, the performance of the sensor is remarkably improved, and the application prospect of the sensor in the fields of marine environment monitoring, biomedical detection and the like is widened.

An all-fiber inline optical tap adopts a configuration of a side-pump signal-and-pump combiner with a double-clad fiber (DCF) and one or more multimode fibers (MMFs). DCF comprises a first cladding and a coupling portion, whereas each of MMFs comprises a taper portion fused around the coupling portion. MMFs are configured to extract a part of combined optical energy and a part of an optical signal leaking in the first cladding of DCF with a sampled optical power proportional to a fiber laser power in a propagating direction. By pre-selecting a proper taper slope of the taper portion and an embedded depth the MMFs fused and embedded in the coupling portion, the all-fiber inline optical tap can be built with a customized ratio used in fiber laser power monitoring, diagnostics, and controls of a fiber laser system.

The application discloses a bladder cancer diagnosis and treatment integrated system and a control method thereof, which comprises a swept-frequency OCT light source, a treatment laser, a wavelength division multiplexer, a double-clad optical fiber, a flexible scanning probe, an endoscope imaging unit and an intelligent image processing and control terminal; imaging light and treatment laser are transmitted in a common light path by using the double-clad optical fiber, and scanning and light beam control are completed by means of a double-axis MEMS micro-mirror. The control method obtains tomographic structure information and depth information by reconstructing OCT data, and controls treatment laser power, galvanometer deflection and laser pause, recovery or stop by combining distance calculation, displacement compensation and blood perfusion monitoring, and is suitable for imaging navigation and closed-loop treatment in bladder cancer surgery.

Methods and systems for delivering power over an optical fiber are provided. In embodiments, light carrying optical power is provided by the optical fiber to a tapered fiber-bundle divider (TFBD), where the light is then divided into branches. In some embodiments, each branch is directed to a respective, further TFBD, where that branch is divided into subsequent branches. Electrical power is generated from each subsequent branch. In some embodiments, the light carries an optical signal, and a signal branch is created by the initial TFBD. In some of these embodiments, a multimode coupler is used to extract optical power from the signal branch. In some embodiments, each branch is matched to an electrical load according to the power generated from that branch and the power requirements of the electrical load. In some embodiments, an all-glass double-clad fiber or a triple-clad fiber is used to provide light.

The multi-module integrated low-fusion-point optical fiber amplifier has the advantages of being compact in structure, high in reliability and good in thermal management performance, a plurality of optical devices with adjacent functions are integrated into sub-modules through the micro-optical patch packaging technology, no optical fiber fusion points exist in the modules, and the optical fiber fusion points are integrated into the sub-modules. Insertion loss, reflection echoes and potential fault points are effectively reduced, and the stability and long-term reliability of an optical path are improved; meanwhile, the compact layout of the optical path of the integrated module is directly combined with a heat dissipation substrate, so that the concentrated heat flow design and heat management are facilitated, local overheating is avoided, and stable output of the high-power erbium-ytterbium-doped double-clad optical fiber is supported; in addition, the module can complete alignment and light path packaging through precise surface mounting in a factory, can complete performance calibration before leaving a factory, and only needs a small number of external interfaces for connection during field installation, thereby reducing the manufacturing and maintenance cost, and improving the yield and consistency.

The application discloses a kind of optical fiber mode detection device and laser output device, it is related to optical fiber technical field, wherein, optical fiber mode detection device includes base, double-clad fiber and detection component, double-clad fiber is set on base, double-clad fiber is formed with detection area, multiple stripping areas are equipped in detection area, the diameter of multiple stripping areas successively decreases along the axial direction of double-clad fiber, to respectively strip out different mode light waves, detection component includes the optical power meter being set on base, optical power meter is set corresponding detection area, to detect the power of stripping light, by setting base, to install double-clad fiber with detection device, and by setting multiple stripping areas in detection area, to strip out different mode light in double-clad fiber, simultaneously by setting optical power meter, to respectively detect the power of stripping light in different stripping areas, to obtain the power of each mode light in optical fiber, to determine the proportion of each mode of optical fiber.

Systems disclosed herein are directed to optical terminals configured for free space communication comprising at least one lens collector assembly comprising a lens and a dual clad fiber optic coupler attached to the at least one lens, and a transceiver operably connected to the at least one lens collector assembly.

The application relates to the field of high-power fiber lasers, and particularly discloses a femtosecond laser preparation method of a pump light recycling grating and a spectrum measuring device. The preparation method takes a double-clad fiber as a substrate, adopts femtosecond laser to be focused in the inner cladding through a coating layer, writes a fiber Bragg grating through a multi-layer line scanning technology, prepares a uniform grating or a chirped grating, and flexibly controls a grating modulation area by adjusting parameters. The spectrum measuring device is composed of an ASE broadband light source, a multimode fiber coupler, a multimode fiber matched with the inner cladding diameter and a double spectrometer, and realizes real-time and accurate measurement of the transmission and reflection spectrum of the inner cladding grating. The application solves the problems of low coupling efficiency, poor reliability and difficulty in reflecting specific wavelengths in the traditional pump light recycling technology, the prepared grating is uniform in modulation, the pump light reflection effect is good, residual pump light can be recycled efficiently, and the system efficiency and integration level of the high-power fiber laser are significantly improved.

An alcohol gas concentration remote sensing device based on mode division multiplexing transmission relates to the field of biomedical measurement technology. It aims to solve the problems of low measurement accuracy and high false alarm rate in the process of non-contact measurement of alcohol content in human exhaled breath. The device comprises a semiconductor laser, an erbium-doped fiber amplifier, a wavelength division multiplexer, a thulium-holmium co-doped double-clad fiber, a few-mode optical isolator, a mode selector, a few-mode optical coupler, a polarization controller, a second optical coupler, a first optical coupler, a first optical fiber collimator, a Kepler beam compressor, a two-color beam splitter, a first receiving lens, a first photodetector, a second receiving lens, a few-mode receiving fiber, a mode demultiplexer, a second photodetector, a third photodetector, a fourth photodetector, an analog-to-digital converter, an FPGA, and a microcomputer. According to the different alcohol absorption laws of different mode light beams during the test or analysis of the alcohol content in human exhaled breath, the receiving end performs multi-mode diversity reception, and the alcohol content is deciphered in multiple modes to improve the measurement accuracy.

An optical metrology device simultaneously performs confocal and non-confocal Raman spectroscopy. The optical metrology device includes a double-clad fiber with a core that acts as a confocal pinhole to receive the confocal signal from the Raman response while simultaneously receiving the non-confocal signal from the Raman response over the inner cladding and core of the double-clad fiber. A spectrometer receives the Raman response via the double-clad fiber to detect the confocal spectroscopic signal from the core and to detect the non-confocal spectroscopic signal from the inner cladding and the core.

The invention provides a coherent laser fiber coupler comprising a pulse continuous coherent beam combination structure which is a porous capillary tube, a plurality of fiber bundles are inserted into the porous capillary tube, and the plurality of fiber bundles are fused, formed and cut in an output end taper area; one end of the square hollow optical fiber output system is welded with the optical fiber bundle, and a square hollow energy transmission optical fiber is adopted in the square hollow optical fiber output system for coupling shaping output. A pulse continuous coherent beam combination structure and a square hollow optical fiber output system are adopted, and through the pulse continuous coherent beam combination structure, center pulse (continuous) signal double-clad optical fiber time domain coherent disturbance, surrounding continuous (pulse) double-clad optical fiber space coherence, multi-path ultrahigh-power continuous laser beam phase interference and power recombination are achieved. Through the square hollow optical fiber output system, multi-path signals are output in a high-power continuous coupling space in a same-phase mode, and the spatial coherent coupling output efficiency and reliability are effectively improved.

The application discloses a cladding light stripper and a manufacturing method thereof and an optical fiber laser, and relates to the technical field of cladding light strippers, wherein the cladding light stripper comprises a double-cladding optical fiber assembly and a triple-cladding bare fiber; the double-cladding optical fiber assembly comprises two double-cladding optical fibers; each double-cladding optical fiber comprises a double-cladding bare fiber and a coating layer which are sequentially sleeved from inside to outside; the double-cladding bare fiber extends out of the coating layer; the triple-cladding bare fiber is in a plurality of sections; the plurality of triple-cladding bare fibers are sequentially fused to form a main body; the two double-cladding optical fibers are respectively fused to two ends of the main body through the double-cladding bare fibers; and the main body is provided with a stripper. The cladding light stripper can be manufactured by using the plurality of triple-cladding bare fibers to manufacture the stripper on the premise that the original advantages of the double-cladding optical fiber and the triple-cladding bare fiber are maintained; thus, the cladding light stripper can prevent a local hot spot from being generated in a certain triple-cladding bare fiber due to long-time bearing of high power, and the ability of the cladding light stripper to strip cladding light is greatly improved.

This invention provides a 980nm fiber laser based on co-pumping by an oscillator and an amplifier, comprising a pump source, an oscillator, a filter element, and a second ytterbium-doped double-clad fiber. The oscillator includes a high-reflectivity fiber grating, a first ytterbium-doped double-clad fiber, and a low-reflectivity fiber grating. The high-reflectivity fiber grating and the low-reflectivity fiber grating together form a resonant cavity. The first ytterbium-doped double-clad fiber, located within the resonant cavity, receives the pump light and generates 980nm signal light through stimulated emission. By designing an optical path structure for co-pumping by the oscillator and amplifier, and utilizing the filter element to filter out 1030nm light while allowing residual pump light to enter the subsequent amplification stage, the unabsorbed residual pump energy in the oscillator is reused. This significantly simplifies the system size and reduces costs while solving the core problems of severe pump energy waste and low optical-to-optical conversion efficiency in existing technologies.

An optical metrology device simultaneously performs confocal and non-confocal Raman spectroscopy. The optical metrology device includes a double-clad fiber with a core that acts as a confocal pinhole to receive the confocal signal from the Raman response while simultaneously receiving the non-confocal signal from the Raman response over the inner cladding and core of the double-clad fiber. A spectrometer receives the Raman response via the double-clad fiber to detect the confocal spectroscopic signal from the core and to detect the non-confocal spectroscopic signal from the inner cladding and the core.

The application belongs to the technical field of optical fiber sensors, and particularly relates to a specific copper ion detection interferometric micro-nano fiber sensor and a preparation method thereof. The specific copper ion detection interferometric micro-nano fiber sensor is composed of a micro-nano fiber and a functional layer on the micro-nano fiber. The micro-nano fiber is obtained by tapering a double-clad fiber, and includes a middle uniform waist region, transition regions on both sides of the uniform waist region, and a normal region connected to the outer end of the transition regions. The uniform waist region is wrapped with the functional layer, and the functional layer is a material layer capable of specifically recognizing copper ions. The application combines the micro-nano fiber and the functional material, and combines the advantages of the micro-nano fiber, such as miniaturization, low cost, high sensitivity and immunity to electromagnetic interference, with the advantages of the functional material, such as high specific surface area, specificity and good biocompatibility. The drift amount of the spectrum under the specific chelation of copper ions and the functional material is monitored.

The invention discloses a stimulated Raman scattering suppressor as well as a preparation method and device thereof, and a chirp tilted fiber bragg grating is prepared in a fiber core of a double-clad fiber by utilizing a femtosecond laser direct writing technology so as to obtain the stimulated Raman scattering suppressor introduced with the chirp tilted fiber bragg grating. According to the method and the device provided by the invention, the femtosecond laser direct writing technology is utilized, the chirp tilted fiber bragg grating is directly prepared in the fiber core of the large-core-diameter double-clad fiber through the coating layer, and the fiber does not need to be pre-processed, so that the preparation efficiency can be improved. The structure of the chirp tilted fiber bragg grating can be flexibly controlled based on the core diameter of the optical fiber and the size of the required wavelength, the stimulated Raman scattering suppression requirements of different power levels and working wavebands are met, and the chirp tilted fiber bragg grating is suitable for high-power optical fiber lasers, high-power optical fiber amplifiers and high-power communication transmission systems.

The present disclosure relates to an optical fiber amplifier comprising a first amplification stage comprising a first active fiber configured to amplify light received from a seed laser or a pre-amplifier stage; a second amplification stage comprising a second active fiber configured for further amplifying light received from the first amplification stage, wherein the second active fiber is configured for supporting only a single mode of light; and an optical device configured for at least partially coupling out undesired light from the optical fiber amplifier, said undesired light being generated from amplified spontaneous emission (ASE) and having a center wavelength of about 1 µm; wherein the first and second active fibers are Er / Yb co-doped double-clad fibers, wherein the optical fiber amplifier is configured for amplifying light having a center wavelength in the range from about 1535 nm to about 1580 nm The present disclosure further relates to a laser system comprising the optical fiber amplifier.

The application discloses a preparation device of a double-clad optical fiber preform, which comprises a bottom die assembly and a cylindrical die vertically extending and having both ends open; an outer cladding glass sleeve matched with the internal structure of the cylindrical die is detachably installed in the cylindrical die, the outer cladding glass sleeve has both ends open, the inside of the outer cladding glass sleeve is used for extruding and filling inner cladding glass melt, and a top die is arranged in the cylindrical die and is butted at the top end of the outer cladding glass sleeve; a first feeding channel for allowing fiber core glass melt to flow and be absorbed into the inner cladding glass is formed in the top die, and the bottom end of the first feeding channel is provided with a discharge port coaxially communicated with the outer cladding glass sleeve; the bottom die assembly is used for plugging the bottom end of the outer cladding glass sleeve, and the bottom die assembly is provided with a cooling mechanism matched with the inner cladding glass cooling, so that the double-clad optical fiber preform with ideal interface, good fiber core diameter uniformity and wide adjustable range of fiber core / cladding ratio can be obtained.

The application discloses a waste light receiving device of a fiber cladding light stripper, which comprises a heat-conducting base and an upper cover shell, the upper cover shell is fixedly connected with the heat-conducting base in a top-and-bottom covering mode, and a light-heat conversion cavity is formed in the inside of the upper cover shell, an inner light-heat conversion fin group is arranged in the light-heat conversion cavity, a stripping section of a double-cladding optical fiber of the fiber cladding light stripper is arranged in the light-heat conversion cavity, and two ends of a glass tube of the fiber cladding light stripper are positioned and fixed by the heat-conducting base and the upper cover shell. The waste light receiving device can reduce the number of times that waste light passes through the fiber cladding light stripper again, avoid repeated and continuous heating of the stripping section optical fiber by the waste light, reduce the risk of burning of the optical fiber in the glass tube, meanwhile, the light-heat conversion process can be uniformly carried out in the whole light-heat conversion cavity, and the risk of burning of the front end of the stripper can be reduced due to the fact that local overheating caused by too fast heat accumulation at the front end of the heat-conducting base and the upper cover shell is effectively avoided.

The application provides a kind of energy and signal integration device based on double-clad optical fiber and use method, comprising: communication transmitting end, high-power laser transmitting end, double-clad optical fiber, photovoltaic converter, communication receiving end and sensing receiving end, wherein: communication transmitting end is connected with communication receiving end through the core of double-clad optical fiber, respectively for completing the transmission and receiving demodulation of communication optical signal;High-power laser transmitting end is connected with photovoltaic converter through the inner cladding of double-clad optical fiber, respectively for completing the sending and receiving conversion of energy optical signal;Sensing receiving end is used for detecting and demodulating the Rayleigh scattering light signal returned from the disturbance position of optical fiber, so as to obtain the disturbance position;Energy optical signal and communication optical signal are transmitted through inner cladding and core respectively, reducing the mutual interference between energy optical signal and communication optical signal, and sensing and positioning the disturbance of optical fiber, so as to realize the integration of energy optical signal transmission, communication optical signal transmission and sensing.

The application discloses a rare earth doped phosphate glass double-clad optical fiber with a wavelength of 1.3 microns, a preparation method and application thereof. The double-clad optical fiber comprises a core, an inner cladding and an outer cladding. The core is doped with Nd 3+ phosphate glass, the inner cladding is doped with Yb 3+ phosphate glass, and the outer cladding is undoped oxide glass. The rare earth doped phosphate glass double-clad optical fiber utilizes the absorption of Yb 3+ ions in the inner cladding to make the transmission loss of the core in the range of 0.9 microns to 1.05 microns greater than or equal to 2 dB / cm, so that the spontaneous radiation of Nd 3+ ions in the core in the two wavelength ranges of 0.9 microns and 1.05 microns is effectively inhibited, and the optical signal-to-noise ratio during 1.3-micron laser operation is improved. The application also provides a full-fiber type 1.3-micron Q-switched fiber laser built by using the double-clad optical fiber.

An optical fiber amplifier (50) comprises: a double-clad optical fiber formed from quartz glass and including a plurality of cores (51) to which a rare earth element is added, an inner cladding (52a) that includes the plurality of cores (51), and an outer cladding (52b) that includes the inner cladding (52a); and an excitation light source that outputs lateral single-mode excitation light to the double-clad optical fiber. The total area of the plurality of cores (51) is 10% or more with respect to the area of the inner cladding (52a).

The utility model discloses a retina fluorescence imaging device, and relates to the technical field of imaging. The retina fluorescence imaging device comprises a light source detection module and a light beam scanning module, the light source detection module comprises a first light source module, a first detection module and a first optical fiber, and the first optical fiber comprises a first double-clad optical fiber and a first coupling optical fiber; excitation light generated by the first light source module is transmitted through a fiber core of the first double-clad optical fiber, enters the light beam scanning module, enters an eyeball after being modulated by the light beam scanning module, and excites a fluorescent light beam formed by a retina to enter the light source detection module through the light beam scanning module. And the optical signal is transmitted to the first detection module through the first cladding of the first double-cladding optical fiber and the first coupling optical fiber and is used for fluorescence imaging, so that the aim of optimizing the retina fluorescence imaging device is fulfilled.