Multi-wavelength coupled-out laser pointer

Abstract

The present application relates to the technical field of quantum dot light emitting, and particularly relates to a multi-wavelength coupling output laser pointer, a polymer waveguide converges output laser of a semiconductor laser into a laser focal point; a waveguide electrode applies a voltage to an output end of the polymer waveguide, so as to change a focal point position of the laser focal point on a multi-layer optical fiber; each layer of the multi-layer optical fiber is doped with colloidal quantum dots, and the colloidal quantum dots in each layer are different; different colloidal quantum dots in the multi-layer optical fiber form corresponding color laser after being excited by the laser focal point. The present application realizes multi-color laser output by using only one pump laser, and can be used for different color laser indication in teaching and other scenes.

Description

Technical Field

[0001] This invention belongs to the field of quantum dot light emission technology, and particularly relates to a laser indicator with multi-wavelength coupled output. Background Technology

[0002] In current teaching, public speaking, and product promotion settings, laser pointers, as a traditional laser device, offer advantages such as long range, high visibility, high precision, and high flexibility, making them an indispensable pointing tool. However, current traditional laser pointers all use laser crystals to generate laser light, and each crystal can only produce one type of laser light, thus limiting the pointer to monochromatic laser output. If a laser pointer needs to generate multi-color laser light, multiple laser crystals must be integrated within the pointer, significantly increasing structural complexity and product cost. Therefore, there is an urgent need for a new type of multi-color laser pointer with a simple structure and low cost to meet the diverse pointing needs of speakers in different scenarios and increase the visibility of presentation information. Summary of the Invention

[0003] In view of this, the present invention aims to provide a multi-wavelength coupled output laser pointer. By applying a voltage to the output end of a polymer waveguide, the output laser is focused into a focal point, and the focal point position is changed, so that the laser can be incident into a multi-layered optical fiber. Since the colloidal quantum dots filled in different layers of the multi-layered optical fiber are different, different lasers are generated after absorbing the pump laser and transitioning. Thus, multi-color laser output can be achieved with only one pump laser, which can be used for different color laser pointers in teaching and other scenarios.

[0004] To achieve the above objectives, the technical solution created by this invention is implemented as follows: A multi-wavelength coupled output laser pointer includes a semiconductor laser, a polymer waveguide, waveguide electrodes, and a multilayer optical fiber: the polymer waveguide focuses the output laser light from the semiconductor laser into a laser focal point; the waveguide electrodes apply a voltage to the output end of the polymer waveguide, changing the focal point of the laser light to fall on the focal point of the multilayer optical fiber; each layer of the multilayer optical fiber is doped with colloidal quantum dots, and the colloidal quantum dots in each layer are different; different colloidal quantum dots in the multilayer optical fiber are excited by the laser focal point to form laser light of corresponding colors.

[0005] Furthermore, the refractive index of colloidal quantum dots in multilayer optical fibers gradually increases from the innermost layer to the outermost layer, so that laser light generated in any layer will enter the innermost layer and be confined to the innermost layer by total internal reflection.

[0006] Furthermore, the semiconductor laser is a pulsed semiconductor laser, with an output laser wavelength of 350nm-450nm, a pulse width of 100ns-100μs, and a pulse frequency of 100Hz-10kHz.

[0007] Furthermore, the waveguide electrode applies a voltage to the output end of the polymer waveguide, causing a temperature change at the output end of the polymer waveguide, which alters the deflection angle of the light emitted from the output end.

[0008] Furthermore, the deflection angle satisfies the following formula: ; Where θ represents the deflection angle, D represents the effective aperture at the output end, (x,y) represents the cross-sectional spatial coordinates of the polymer waveguide, z represents the laser propagation direction coordinates of the polymer waveguide, C represents the total length along the laser propagation direction of the polymer waveguide, k represents the property parameters of the polymer waveguide, n0 represents the initial reference refractive index of the polymer waveguide, μ represents the Poisson's ratio, and α T This represents the coefficient of thermal expansion of the polymer waveguide. This represents the rate of change of the actual refractive index n of the polymer waveguide after the influence of temperature T. This represents the temperature difference between the polymer waveguide's temperature after being subjected to voltage from the waveguide electrodes and its room temperature.

[0009] Furthermore, it also includes a collimating lens, which is coaxial with the multi-layered optical fiber and is used to output the laser generated by the multi-layered optical fiber.

[0010] Furthermore, the collimating lens is coated with an anti-reflective film of 300nm-700nm on both sides, and the focal length of the collimating lens is 1mm-20mm.

[0011] Compared with the prior art, the present invention can achieve the following beneficial effects: The present invention creates a multi-wavelength coupled output laser pointer, which solves the problem that traditional laser pointers can only output in a single color. If multi-color output is required, multiple laser crystals need to be integrated internally to generate multi-color lasers. This invention greatly reduces the size and manufacturing cost of laser pointers, and realizes that multi-color laser output can be achieved with only one pump laser. It can be used for different color laser pointers in teaching and other scenarios. Attached Figure Description

[0012] 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 This is a schematic diagram of the structure of a multi-wavelength coupled output laser pointer as described in an embodiment of the present invention.

[0013] Explanation of reference numerals in the attached figures: 1. Semiconductor laser; 2. Polymer waveguide; 3. Waveguide electrode; 4. Multilayer optical fiber; 5. Colloidal quantum dot; 6. Collimating lens. Detailed Implementation

[0014] 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.

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0016] 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 orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used 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, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0017] 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.

[0018] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 As shown in the embodiment of the present invention, the multi-wavelength coupled output laser pointer includes a semiconductor laser 1, a polymer waveguide 2, a waveguide electrode 3, and a multilayer optical fiber 4. The polymer waveguide 2 focuses the output laser light from the semiconductor laser 1 into a laser focal point. The waveguide electrode 3 applies a voltage to the output end of the polymer waveguide 2, changing the focal point of the laser light to fall on the focal point of the multilayer optical fiber 4. Each layer of the multilayer optical fiber 4 is doped with colloidal quantum dots 5, and the colloidal quantum dots 5 in each layer are different. Different colloidal quantum dots 5 in the multilayer optical fiber 4, when excited by the laser focal point, form laser light of corresponding colors.

[0020] In some embodiments, the refractive index of the colloidal quantum dots 5 in the multilayer optical fiber 4 gradually increases from the inner layer to the outer layer, so that the laser generated in any layer will enter the innermost layer and be confined to the innermost layer by total internal reflection.

[0021] In this embodiment of the invention, the multilayer optical fiber 4 specifically includes four layers. Specifically, three polymer materials with different refractive indices are selected, and three different quantum dot materials are incorporated into the polymer materials to form three optical fiber layers n1, n2, and n3 that can generate lasers inside the multilayer optical fiber 4. The colloidal quantum dots 5 in the n1, n2, and n3 layers generate red, green, and blue lasers respectively after absorbing laser transition radiation. The outermost layer of the multilayer optical fiber 4 (i.e., the fourth layer from the innermost layer to the outermost layer) is the optical fiber cladding. The refractive indices n1 of the n1 layer, n2 of the n2 layer, n3 of the n3 layer, and n4 of the optical fiber cladding satisfy n1 > n2 > n3 > n4. Due to the total internal reflection effect, the laser generated from any layer will enter the n1 layer and be confined within the n1 layer by total internal reflection, ultimately outputting the multilayer optical fiber 4. By controlling the size of colloidal quantum dots 5, three types of colloidal quantum dots 5 can be made to generate red, green, and blue lasers respectively after absorbing laser transition radiation. The red laser wavelength is 620-750 nm, the green laser wavelength is 495-570 nm, and the blue laser wavelength is 450-495 nm. More specifically, the n1 layer has a diameter of 4-100 μm, is made of PS (polystyrene), has a refractive index of 1.59-1.6, and is doped with CsPbI. 1.5 Br 1.5 Perovskite quantum dots, when excited by a laser focus, emit red light with a wavelength of 650 nm; the n2 layer, with a diameter of 10-100 μm, is made of PC (polycarbonate) with a refractive index of 1.586-1.588, and is doped with CsPbBr3 perovskite quantum dots, emitting green light with a wavelength of 532 nm when excited by a laser focus; the n3 layer, with a diameter of 20-100 μm, is made of PE (polyethylene) with a refractive index of 1.50-1.54, and is doped with CsPbBr3... 1.5 Cl 1.5 Perovskite quantum dots, when excited by a laser focus, produce blue light with a wavelength of 450 nm; the cladding material of the optical fiber is PMMA (polymethyl methacrylate), with a refractive index of 1.490-1.492.

[0022] In this embodiment of the invention, the fabrication process of the multilayer optical fiber 4 includes: adding CsPbI with an initial mass concentration of 8 mg / ml. 1.5 Br 1.5 Perovskite quantum dots were dissolved in toluene solvent and vibrated in an ultrasonic cleaner for 5 minutes to allow CsPbI to dissolve. 1.5 Br 1.5After perovskite quantum dots were uniformly mixed with toluene solvent, this mixture was then mixed with molten PS material. During solidification, the mixture was tapered to form the n1 layer of multilayer optical fiber 4. CsPbBr3 perovskite quantum dots with an initial mass concentration of 10 mg / ml and CsPbBr3 perovskite quantum dots with an initial mass concentration of 8 mg / ml were then mixed with... 1.5 Cl 1.5 Perovskite quantum dots were dissolved in toluene solvent in the same manner and then mixed with PC and PE polymers after ultrasonic vibration to form the materials needed to prepare the n2 and n3 layers, respectively. A PC material doped with CsPbBr3 perovskite quantum dots was uniformly coated around the n1 layer to form the n2 layer. After curing, a PC material doped with CsPbBr3 perovskite quantum dots was then coated on top. 1.5 Cl 1.5 Perovskite quantum dot PE material forms an n3 layer, which is then cured again before being coated with PMMA material to form the cladding of a multilayer polymer optical fiber. After fabrication, transmission scanning electron microscopy analysis revealed CsPbI in the three quantum dot-doped fibers. 1.5 Br 1.5 The diameter of perovskite quantum dots is 14 nm, and the diameter of CsPbBr3 perovskite quantum dots is 12 nm. 1.5 Cl 1.5 The diameter of perovskite quantum dots is 10 nm.

[0023] In some embodiments, the semiconductor laser 1 is a pulsed semiconductor laser 1, with an output laser wavelength of 350nm-450nm, a pulse width of 100ns-100μs, and a pulse frequency of 100Hz-10kHz. After the pump laser is emitted from the semiconductor laser 1, it is transmitted through the polymer waveguide 2 to the multilayer optical fiber 4.

[0024] In this embodiment of the invention, the polymer waveguide 2 can be made of any one of PS, PC, or PE. The polymer is then heated and stretched to form the polymer waveguide 2. The polymer waveguide 2 can be stretched into an optical fiber with a circular end face and a diameter of 10-20 μm; or it can be stretched into an optical fiber with a square end face and an end face size of 10 μm × 10 μm or 20 μm × 20 μm. In addition, in this embodiment of the invention, waveguide electrodes 3 are deposited on both sides of the output end of the polymer waveguide 2 using a thermal evaporation method. The waveguide electrodes 3 can be made of gold, aluminum, copper, etc. By changing the voltage applied to the polymer waveguide 2, the refractive index of the polymer waveguide 2 can be changed, generating a thermal lensing effect, which focuses the output laser into a focal point. The temperature change caused by the different voltages applied to the electrodes on both sides can change the position of the thermal lens focal point, thereby changing the laser emission angle, and thus allowing the laser to irradiate the n1, n2, and n3 layers of the multilayer optical fiber 4 respectively.

[0025] In some embodiments, the waveguide electrode 3 applies a voltage to the output terminal of the polymer waveguide 2, causing a temperature change at the output terminal of the polymer waveguide 2, thereby altering the deflection angle of the light emitted from the output terminal. The deflection angle satisfies the following equation: ; Where θ represents the deflection angle, D represents the effective aperture at the output end, (x,y) represents the cross-sectional spatial coordinates of polymer waveguide 2, z represents the laser propagation direction coordinates of the polymer waveguide, C represents the total length along the laser propagation direction of polymer waveguide 2, k represents the property parameters of polymer waveguide 2, n0 represents the initial reference refractive index of polymer waveguide 2, μ represents the Poisson's ratio, and α T This represents the coefficient of thermal expansion of polymer waveguide 2. This represents the rate of change of the actual refractive index n of polymer waveguide 2 after the influence of temperature T. This represents the temperature difference between the polymer waveguide 2 after being subjected to voltage from the waveguide electrode 3 and its room temperature (the initial temperature when no voltage is applied). The property parameter k of the polymer waveguide 2 specifically includes the intrinsic material parameters (or substrate properties), structural parameters, optical parameters, and thermal parameters of the polymer waveguide 2. Specifically, structural parameters include the cross-sectional shape and dimensions of the polymer waveguide 2; optical parameters include the basic transmittance and optical transmission loss coefficient of the polymer waveguide 2; and thermal parameters include the thermal conductivity and thermal diffusivity of the polymer waveguide 2.

[0026] In some embodiments, a collimating lens 6 is further included, which is coaxial with the multilayer fiber 4 and is used to output the laser generated by the multilayer fiber 4. The focal length of the collimating lens 6 is 1mm-20mm. The collimating lens 6 can be a spherical lens or an aspherical lens, and both sides of the collimating lens 6 are coated with an anti-reflection coating of 300nm-700nm.

[0027] 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.

[0028] 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 laser pointer with multi-wavelength coupled output, characterized in that, Includes semiconductor lasers, polymer waveguides, waveguide electrodes, and multilayer optical fibers: Polymer waveguides focus the output laser light from semiconductor lasers into a laser focal point; A voltage is applied to the output end of the polymer waveguide by the waveguide electrode, changing the focal point of the laser to fall on the focal position of the multilayer optical fiber; Each layer of the multilayer optical fiber is doped with colloidal quantum dots, and the colloidal quantum dots in each layer are different. Different colloidal quantum dots in multilayer optical fibers are excited by a laser focal point to form lasers of corresponding colors.

2. The multi-wavelength coupled output laser pointer according to claim 1, characterized in that, The refractive index of colloidal quantum dots in multilayer optical fibers gradually increases from the innermost layer to the outermost layer, so that laser light generated in any layer will enter the innermost layer and be confined to the innermost layer by total internal reflection.

3. The multi-wavelength coupled output laser pointer according to claim 1, characterized in that, The semiconductor laser is a pulsed semiconductor laser with an output laser wavelength of 350nm-450nm, a pulse width of 100ns-100μs, and a pulse frequency of 100Hz-10kHz.

4. The multi-wavelength coupled output laser pointer according to claim 1, characterized in that, A voltage is applied to the output end of the polymer waveguide by the waveguide electrode, causing a temperature change at the output end of the polymer waveguide, which alters the deflection angle of the light emitted from the output end.

5. The multi-wavelength coupled output laser pointer according to claim 4, characterized in that, The deflection angle satisfies the following formula: ； Where θ represents the deflection angle, D represents the effective aperture at the output end, (x,y) represents the cross-sectional spatial coordinates of the polymer waveguide, z represents the laser propagation direction coordinates of the polymer waveguide, C represents the total length along the laser propagation direction of the polymer waveguide, k represents the property parameters of the polymer waveguide, n0 represents the initial reference refractive index of the polymer waveguide, μ represents the Poisson's ratio, and α T This represents the coefficient of thermal expansion of the polymer waveguide. This represents the rate of change of the actual refractive index n of the polymer waveguide after the influence of temperature T. This represents the temperature difference between the polymer waveguide's temperature after being subjected to voltage from the waveguide electrodes and its room temperature.

6. The multi-wavelength coupled output laser pointer according to claim 1, characterized in that, It also includes a collimating lens, which is coaxial with the multi-layered optical fiber and is used to output the laser generated by the multi-layered optical fiber.

7. The multi-wavelength coupled output laser pointer according to claim 6, characterized in that, The collimating lens is coated with an anti-reflective coating of 300nm-700nm on both sides, and the focal length of the collimating lens is 1mm-20mm.

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