White laser synthesis device based on quantum dot photon lantern structure and preparation method thereof

Abstract

This invention relates to the field of laser semiconductor technology, and more particularly to a white laser combining device based on a quantum dot photonic lantern structure and its fabrication method. The device includes a first few-mode silica fiber, a quantum dot photonic lantern, and a second few-mode silica fiber. The first few-mode silica fiber receives the input laser light. One end of the first few-mode silica fiber is connected to one end of the quantum dot photonic lantern, allowing the quantum dot photonic lantern to receive the input laser light and be excited by the input laser to generate red, green, and blue light. The other end of the second few-mode silica fiber is connected to the other end of the quantum dot photonic lantern, receiving the red, green, and blue light, and combining the three types of light to form and output white light. This invention combines colloidal quantum dots capable of generating red, blue, and green light with a photonic lantern, simplifying the traditional fiber-optic white laser combining method. It enables a single beam of light to be split and combined within the quantum dot lantern to obtain the desired white light.

Description

Technical Field

[0001] This invention belongs to the field of laser semiconductor technology, and particularly relates to a white laser synthesis device based on a quantum dot photonic lantern structure and its preparation method. Background Technology

[0002] White lasers based on the synthesis of multiple monochromatic lights possess advantages such as high conversion efficiency and good color rendering index, making them one of the ideal next-generation lighting and display light sources. They also boast advantages such as small size, long lifespan, stable performance, and good color rendering index, showing broad application prospects in laser lighting and laser display fields. Traditional fiber-optic white laser combining typically couples red, green, and blue lasers separately into an optical fiber and then combines multiple laser beams to form a white laser. This process requires multiple different monochromatic light sources, and each monochromatic light needs to be individually adjusted to achieve the optimal ratio. Therefore, a novel white light combining device is urgently needed. This structure can effectively simplify the white laser combining device and provide a new option for white light combining technology. Summary of the Invention

[0003] In view of this, the present invention aims to provide a white laser synthesis device and its preparation method based on a quantum dot photonic lantern structure. By combining colloidal quantum dots that can generate red, blue and green light with a photonic lantern, the traditional fiber white laser beam combining method is simplified. A beam of light can be split and combined inside the quantum dot lantern to obtain white light that meets the requirements.

[0004] To achieve the above objectives, the technical solution created by this invention is implemented as follows: A white laser combining device based on a quantum dot photonic lantern structure includes: a first few-mode silica fiber for receiving input laser light; a quantum dot photonic lantern, wherein the first few-mode silica fiber is connected to one end of the quantum dot photonic lantern, enabling the quantum dot photonic lantern to receive the input laser light and be excited by the input laser light to form red, green, and blue light; and a second few-mode silica fiber connected to the other end of the quantum dot photonic lantern, receiving red, green, and blue light, combining the three light beams to form and output white light.

[0005] Furthermore, the quantum dot photonic lantern includes multiple single-mode optical fibers filled with colloidal quantum dots; the multiple single-mode optical fibers are divided into three groups according to the type of colloidal quantum dots inside, so that the input laser enters the three groups of single-mode optical fibers respectively, forming red light, green light and blue light respectively.

[0006] Furthermore, the core diameter range of the first few-mode silica fiber, the second few-mode silica fiber, and the single-mode fiber is 4-10 μm.

[0007] Furthermore, the wavelength range of the input laser is 300-400 nm, the wavelength range of red light is 620-750 nm, the wavelength range of blue light is 450-495 nm, and the wavelength range of green light is 495-570 nm.

[0008] A method for fabricating a white laser synthesizing device based on a quantum dot photonic lantern structure, the white laser synthesizing device based on a quantum dot photonic lantern structure provided by the present invention, includes: S1: Fabrication of hollow photonic lantern, first few-mode silica fiber, and second few-mode silica fiber; S2: To prepare colloidal quantum dots that produce red, green and blue light respectively; S3: After injecting the colloidal quantum dots obtained in step S2 into the hollow photonic lantern obtained in step S1, the hollow photonic lantern and the colloidal quantum dots inside it are solidified to obtain a quantum dot photonic lantern. S4: The two ends of the quantum dot photonic lantern obtained in step S3 are fused to the first few-mode quartz fiber and the second few-mode quartz fiber prepared in step S1, respectively, to obtain the white laser synthesis device.

[0009] Furthermore, in step S1, multiple hollow single-mode optical fibers are divided into three groups, arranged closely together, and inserted into the outer sheath to form a hollow photonic lantern. The three groups of hollow single-mode optical fibers correspond to colloidal quantum dots for red light, green light, and blue light, respectively.

[0010] Furthermore, in step S1, the fabrication process of the first few-mode silica fiber or the second few-mode silica fiber includes: tightly arranging multiple hollow single-mode fibers to form a bundle, inserting the bundle into the outer sheath to form a prefabricated fiber bundle, and performing a fused taper operation on the prefabricated fiber bundle to form the first few-mode silica fiber or the second few-mode silica fiber; one end of the fused taper of the first few-mode silica fiber or the second few-mode silica fiber is the few-mode end, and the other end is the single-mode end.

[0011] Furthermore, in step S4, the two ends of each single-mode fiber in the quantum dot photonic lantern are respectively fused to the single-mode ends of the first few-mode silica fiber and the second few-mode silica fiber.

[0012] Furthermore, in step S2, the quantum dot materials and quantum dot diameters in the three types of colloidal quantum dots are different.

[0013] Furthermore, in step S2, the quantum dot materials and quantum dot diameters in the three types of colloidal quantum dots are the same, and the preparation temperatures of the three types of colloidal quantum dots are different.

[0014] Compared with the prior art, the present invention can achieve the following beneficial effects: The white laser combining device and its preparation method based on a quantum dot photonic lantern structure, as described in this invention, combine white light beam combining technology with a quantum dot photonic lantern. The laser light is split into multiple beams after passing through the tapered region of the photonic lantern. After absorption and transition by quantum dots of different sizes and concentrations, red, green, and blue light of other wavelengths are generated. Then, after beam combining, a standard white laser beam is obtained. This device can obtain a white laser that meets the requirements by using only a single beam of light through its internal beam splitting and combining, thus introducing a simpler beam combining device for white laser beam combining technology. Attached Figure Description

[0015] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A schematic diagram of the structure of the white laser synthesis device based on the quantum dot photonic lantern structure described in the embodiments of the present invention; Figure 2 This is a schematic flowchart illustrating the fabrication method of the white laser synthesis device based on the quantum dot photonic lantern structure described in the embodiments of the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. First few-mode silica fiber; 2. Quantum dot photonic lantern; 3. Second few-mode silica fiber; 4. Colloidal quantum dot; 5. Single-mode fiber; 6. Few-mode end; 7. Single-mode end. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not constitute a limitation thereof.

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 As shown in the embodiment of the present invention, the white laser synthesis device based on a quantum dot photonic lantern structure includes a first few-mode quartz fiber 1, a quantum dot photonic lantern 2, and a second few-mode quartz fiber 3. The first few-mode quartz fiber 1 receives the input laser light and is connected to one end of the quantum dot photonic lantern 2, enabling the quantum dot photonic lantern 2 to receive the input laser light and be excited by the input laser to generate red, green, and blue light. The second few-mode quartz fiber 3 is connected to the other end of the quantum dot photonic lantern 2, receiving the red, green, and blue light, and combining the three light beams to form and output white light.

[0023] In some embodiments, the quantum dot photonic lantern includes multiple single-mode optical fibers 5 filled with colloidal quantum dots 4. The multiple single-mode optical fibers 5 are divided into three groups according to the type of colloidal quantum dots inside, so that the input laser enters the three groups of single-mode optical fibers respectively, forming red light, green light and blue light respectively.

[0024] In one specific embodiment, the quantum dot photonic lantern includes three single-mode optical fibers 5 injected with colloidal quantum dots 4, and the three single-mode optical fibers 5 respectively generate red light, green light and blue light.

[0025] In some embodiments, the core diameters of the first few-mode silica fiber 1, the second few-mode silica fiber 3, and the single-mode fiber 5 range from 4 to 10 μm. In one specific embodiment, the core diameters of the first few-mode silica fiber 1, the second few-mode silica fiber 3, and the single-mode fiber 5 are 8 μm.

[0026] In some embodiments, the wavelength range of the input laser is 300-400 nm, the wavelength range of the red light is 620-750 nm, the wavelength range of the blue light is 450-495 nm, and the wavelength range of the green light is 495-570 nm.

[0027] In one specific embodiment, a 360nm input laser beam is phase-modulated and coupled into a first few-mode silica fiber 1. Upon transmission to a quantum dot photonic lantern 2, it is split into three beams. After absorption and transition through their respective colloidal quantum dots, the input laser beam generates 650nm red light, 532nm green light, and 450nm blue light, respectively, with a splitting ratio of 0.477:0.334:0.189. The red, green, and blue light beams are then combined through a second few-mode fiber 3 to output a standard white laser with a color temperature close to 6500K.

[0028] A method for fabricating a white laser synthesis device based on a quantum dot photonic lantern structure, according to the white laser synthesis device based on a quantum dot photonic lantern structure provided by the present invention, such as... Figure 1 and Figure 2 As shown, it includes: S1: Fabrication of a hollow photonic lantern, a first few-mode quartz fiber 1, and a second few-mode quartz fiber 3.

[0029] In some embodiments, multiple hollow single-mode optical fibers are arranged in three tightly packed groups and inserted into an outer sheath to form a hollow photonic lantern. The three groups of hollow single-mode optical fibers correspond to colloidal quantum dots for red, green, and blue light, respectively. The fabrication process of the first few-mode silica fiber 1 or the second few-mode silica fiber 3 includes: tightly arranging multiple hollow single-mode optical fibers to form a bundle; inserting the bundle into an outer sheath to form a prefabricated fiber bundle; and performing a fused taper operation on the prefabricated fiber bundle to form the first few-mode silica fiber 1 or the second few-mode silica fiber 3. One end of the fused taper of the first few-mode silica fiber 1 or the second few-mode silica fiber 3 is the few-mode end 6, and the other end is the single-mode end 7.

[0030] In one specific embodiment, three hollow single-mode optical fibers are tightly arranged and inserted into an outer sheath to form a hollow photonic lantern. The three hollow single-mode optical fibers correspond to colloidal quantum dots for red, green, and blue light, respectively. The fabrication process of the first few-mode silica fiber 1 or the second few-mode silica fiber 3 includes: tightly arranging the three hollow single-mode optical fibers to form a bundle; inserting the bundle into an outer sheath to form a prefabricated fiber bundle; and performing a fused taper operation on the prefabricated fiber bundle to form the first few-mode silica fiber 1 or the second few-mode silica fiber 3. One end of the fused taper of the first few-mode silica fiber 1 or the second few-mode silica fiber 3 is the few-mode end 6, and the other end is the single-mode end 7, in which one end of the three hollow single-mode optical fibers is retained.

[0031] S2: Prepare colloidal quantum dots that produce red, green and blue light respectively.

[0032] In some embodiments, the quantum dot materials and quantum dot diameters in the three types of colloidal quantum dots are different.

[0033] In one specific embodiment, CsPbI with an initial mass concentration of 8 mg / ml was used. 1.5 Br 1.5 Perovskite quantum dots were dissolved in toluene solvent and agitated in an ultrasonic cleaner for 5 minutes to ensure homogeneity. This solvent mixture was then combined with PS (polystyrene) adhesive to obtain colloidal quantum dots corresponding to red light. Similarly, CsPbBr3 perovskite quantum dots with an initial mass concentration of 10 mg / ml and CsPbBr3 with an initial mass concentration of 8 mg / ml were mixed... 1.5 Cl 1.5 Perovskite quantum dots were dissolved in toluene solvent in the same manner and then mixed with PS adhesive after ultrasonic vibration to obtain colloidal quantum dot materials corresponding to blue and green light, respectively. The three prepared colloidal quantum dots were stored in a light-proof, sealed environment. By adjusting the doping ratio and size of the colloidal quantum dots, the power of red, blue, and green light was controlled, thereby obtaining white light of different color temperatures.

[0034] In some embodiments, the quantum dot materials and quantum dot diameters in the three types of colloidal quantum dots are the same, and the preparation temperatures of the three types of colloidal quantum dots are different.

[0035] In one specific embodiment, the quantum dot material in the three types of colloidal quantum dots can also be other materials such as cadmium selenide (PbTe), copper indium sulfide (CuInS2), and silver indium sulfide (AgInS2). By controlling the preparation temperature of the colloidal quantum dots, the conversion wavelength of the laser can be changed to generate red, blue, and green light.

[0036] S3: After injecting the colloidal quantum dots obtained in step S2 into the hollow photonic lantern obtained in step S1, the hollow photonic lantern and the colloidal quantum dots inside it are solidified to obtain a quantum dot photonic lantern.

[0037] In one specific embodiment, three types of colloidal quantum dots are injected into corresponding hollow single-mode optical fibers using a mechanical pump. After the toluene component of the PS adhesive in the three colloidal quantum dot materials has evaporated, three single-mode optical fibers 5 doped with colloidal quantum dots are obtained. During the filling process, it is important to ensure that there are no impurities or air bubbles inside the three types of doped colloidal quantum dots 1. After curing, transmission scanning electron microscopy analysis reveals that the diameter of the CsPbI1.5Br1.5 perovskite quantum dots in the three single-mode optical fibers 5 is 14 nm, the diameter of the CsPbBr3 perovskite quantum dots is 12 nm, and the diameter of the CsPbBr1.5Cl1.5 perovskite quantum dots is 10 nm.

[0038] S4: The two ends of the quantum dot photonic lantern obtained in step S3 are fused to the first few-mode quartz fiber and the second few-mode quartz fiber prepared in step S1, respectively, to obtain the white laser synthesis device.

[0039] In some embodiments, the two ends of each single-mode fiber 5 in the quantum dot photonic lantern 2 are respectively fused to the single-mode ends 7 of the first few-mode silica fiber 1 and the second few-mode silica fiber 3, such as... Figure 1 As shown, Figure 1 The dashed line indicates the fusion splice position, ensuring that the input laser enters the quantum dot photonic lantern 2 from the few-mode end 6 of the first few-mode quartz fiber 1 and finally exits from the few-mode end 6 of the second few-mode quartz fiber 3.

[0040] It should be understood that the various forms of processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this invention disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this invention can be achieved, and this is not limited herein.

[0041] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A white laser synthesis device based on a quantum dot photonic lantern structure, characterized in that, include: The first few-mode quartz fiber receives the input laser light; A quantum dot photonic lantern, wherein a first few-mode silica fiber is connected to one end of the quantum dot photonic lantern, so that the quantum dot photonic lantern receives the input laser and is excited by the input laser to generate red, green and blue light; The second few-mode quartz fiber is connected to the other end of the quantum dot photonic lantern, receiving the red light, the green light and the blue light, combining the three light beams to form and output white light.

2. The white laser synthesis device based on a quantum dot photonic lantern structure according to claim 1, characterized in that, The quantum dot photonic lantern comprises multiple single-mode optical fibers injected with colloidal quantum dots; Multiple single-mode optical fibers are divided into three groups according to the type of colloidal quantum dots inside them, and the input laser light enters the three groups of single-mode optical fibers respectively to form the red light, the green light and the blue light respectively.

3. The white laser synthesis device based on a quantum dot photonic lantern structure according to claim 2, characterized in that, The core diameter range of the first few-mode silica fiber, the second few-mode silica fiber, and the single-mode fiber is 4-10 μm.

4. The white laser synthesis device based on a quantum dot photonic lantern structure according to claim 1, characterized in that, The wavelength range of the input laser is 300-400 nm, the wavelength range of the red light is 620-750 nm, the wavelength range of the blue light is 450-495 nm, and the wavelength range of the green light is 495-570 nm.

5. A method for fabricating a white laser synthesizing device based on a quantum dot photonic lantern structure, the white laser synthesizing device based on a quantum dot photonic lantern structure according to any one of claims 1 to 4, characterized in that, include: S1: Fabrication of a hollow photonic lantern, the first few-mode silica fiber, and the second few-mode silica fiber; S2: Preparation of colloidal quantum dots that generate red, green and blue light; S3: After injecting the colloidal quantum dots obtained in step S2 into the hollow photonic lantern obtained in step S1, the hollow photonic lantern and the colloidal quantum dots inside it are solidified to obtain the quantum dot photonic lantern. S4: The two ends of the quantum dot photonic lantern obtained in step S3 are fused to the first few-mode quartz fiber and the second few-mode quartz fiber prepared in step S1, respectively, to obtain the white laser synthesis device.

6. The white laser synthesis device based on a quantum dot photonic lantern structure according to claim 5, characterized in that, In step S1, multiple hollow single-mode optical fibers are divided into three groups, arranged closely together, and then inserted into the outer sheath to form the hollow photonic lantern. The three groups of hollow single-mode optical fibers correspond to colloidal quantum dots for red light, green light, and blue light, respectively.

7. The white laser synthesis device based on a quantum dot photonic lantern structure according to claim 5, characterized in that, In step S1, the fabrication process of the first few-mode silica fiber or the second few-mode silica fiber includes: Multiple hollow single-mode optical fibers are tightly arranged to form a bundle. After the bundle is inserted into the outer tube, it forms a pre-fabricated fiber bundle. The pre-fabricated fiber bundle is then subjected to a fused taper operation to form either the first few-mode silica fiber or the second few-mode silica fiber. One end of the fused taper of the first few-mode silica fiber or the second few-mode silica fiber is the few-mode end, and the other end is the single-mode end.

8. The white laser synthesis device based on a quantum dot photonic lantern structure according to claim 7, characterized in that, In step S4, the two ends of each single-mode fiber in the quantum dot photonic lantern are respectively fused to the single-mode ends of the first few-mode silica fiber and the second few-mode silica fiber.

9. The white laser synthesis device based on a quantum dot photonic lantern structure according to claim 5, characterized in that, In step S2, the quantum dot materials and quantum dot diameters are different in the three types of colloidal quantum dots.

10. The white laser synthesis device based on a quantum dot photonic lantern structure according to claim 5, characterized in that, In step S2, the quantum dot materials and quantum dot diameters in the three types of colloidal quantum dots are the same, and the preparation temperatures of the three types of colloidal quantum dots are different.

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