Aspherical lens with high coupling efficiency for 510nm-535nm laser light source shaping and light source coupling module

Abstract

The utility model discloses a kind of high coupling efficiency's aspherical lens and light source coupling module for 510nm-535nm laser light source shaping, aspherical lens is in order from light emission end to light receiving end front surface, side surface and rear surface, aspherical lens will wavelength be 510-535nm, the size of luminous surface is 2 μm ×6 μm, the laser of exit beam divergence angle Y direction is 22.5 °, X direction is 6.3 °, converges into 9.0 μm ×3 μm's light spot at the light receiving end of distance light emission end 4.88mm, and coupling with vertical aperture NA=0.15's single-mode fiber, after transmission by single-mode fiber, the conical beam of luminous area site 9 μm, luminous angle site 17 °.Light source coupling module, including above-mentioned aspherical lens, the optical axis of aspherical lens, green laser tube's luminous chip, single-mode fiber's core and module's packaging line alignment, the green laser tube, aspherical lens and optical fiber one end are packaged in packaging shell.The utility model discloses a kind of high coupling efficiency's aspherical lens and light source coupling module for 510nm-535nm laser light source shaping, can guarantee the light spot of output end is circular center light spot, and energy distribution is uniform, and brightness is uniform.

Description

Technical Field

[0001] This utility model relates to the field of optical communication technology, specifically to aspherical lenses, and more particularly to an aspherical lens with high coupling efficiency for shaping 510nm-535nm laser light sources and a light source coupling module. Background Technology

[0002] In the existing measurement and mapping industry, 510nm-535nm laser light sources (referred to as green light) are shaped into circular light spots and are widely used in industries such as measurement, mapping, and medical care that have high requirements for the quality of the light spot and line of the light source.

[0003] Green (510nm-535nm) LD lasers are used as direct light sources, and then focused by lenses to form point or line applications. Because 510nm-535nm LD lasers employ edge-emitting semiconductor (EEL) technology, compared to vertical-cavity surface-emitting lasers (VCSELs), EEL technology is more mature and offers advantages such as a wider wavelength range, higher electro-optical conversion efficiency, and higher power, making it widely used in the market. However, due to the inherent manufacturing characteristics of EELs, the vertical divergence angle is much larger than the horizontal divergence angle, resulting in an elliptical beam.

[0004] In applications, especially in the surveying tools industry, the conversion of elliptical laser spots into lines results in uneven energy distribution and locally darker laser lines. Users will perceive a noticeable change, thus affecting the user experience. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to solve the technical problem that there is uneven energy distribution and local dimming of laser lines after the elliptical light spot is converted into a line in the prior art, this utility model provides an aspherical lens with high coupling efficiency for shaping 510nm-535nm laser light sources and a light source coupling module, which can ensure that the light spot at the output end is a circular light spot, and that the energy distribution and brightness are uniform.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a high-coupling-efficiency aspherical lens for shaping 510nm-535nm laser light sources. The aspherical lens consists of a front surface, a side surface, and a rear surface from the light emitting end to the light receiving end. The aspherical lens focuses a laser with a wavelength of 510-535nm, a light-emitting surface size of 2μm×6μm, and an output beam divergence angle of 22.5° in the Y direction and 6.3° in the X direction at the light receiving end 4.88mm away from the light emitting end into a 9.0μm×3μm light spot, which is coupled with a single-mode optical fiber with a vertical aperture of NA=0.15. After transmission through the single-mode optical fiber, it forms a conical beam with a light-emitting area of ​​9μm and a light-emitting angle of 17°.

[0007] Both the front and rear surfaces are aspherical surfaces, and their surface shape is an even-order aspherical surface with the highest order of 10, as shown in the equation:

[0008] ,in ;

[0009] In the formula, Taking the intersection of each aspherical surface and the optical axis as the starting point, along the axial direction of the optical axis, k is the conic coefficient, and c is the central curvature of the mirror surface. Let be the radius of curvature in the mirror, and r be the vertical height of a point on the mirror surface. , , , , The coefficients of higher-order terms in the aspherical formula are shown in the table below:

[0010] Aspheric coefficient , , , , The possible values ​​of:

[0011]

[0012] This invention relates to a high-coupling-efficiency aspherical lens for shaping 510nm-535nm laser sources. It couples a light source with a specific wavelength, emitting surface, and beam divergence angle to a single-mode optical fiber, forming a conical beam with a specific emitting region and angle.

[0013] Furthermore, the front surface is a forward-convex aspherical surface, the rear surface is a backward-convex aspherical surface, and the side surface is a cylindrical surface with a diameter of 2.5 mm.

[0014] Furthermore, the distance between the vertex of the front surface and the vertex of the rear surface is the center thickness of the lens, which is 1.3 ± 0.02 mm.

[0015] Furthermore, the light-transmitting aperture of the front surface is 1.2 mm, and the light-transmitting aperture of the rear surface is 1.6 mm.

[0016] Furthermore, the lens is made of D-ZLaF50 glass, which has a refractive index of 1.8 for a light beam with a wavelength of 510-535nm.

[0017] Furthermore, a protective glass is provided between the front surface and the light emitting end, the distance between the protective glass and the vertex of the front surface is 0.74 mm, and the thickness of the protective glass is 0.3 mm.

[0018] The technical solution adopted by this utility model to solve its technical problem is: a light source coupling module, including the above-mentioned aspherical lens, wherein the optical axis of the aspherical lens, the light-emitting chip of the green laser tube, the fiber core of the single-mode fiber are aligned with the packaging line of the module, and one end of the green laser tube, the aspherical lens and the fiber is encapsulated in the packaging shell.

[0019] Furthermore, the aspherical lens, single-mode optical fiber, and packaging shell are connected by adhesive dispensing.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. This invention relates to a high-coupling-efficiency aspherical lens and a light source coupling module for shaping 510nm-535nm laser light sources. The aspherical lens couples the light emitted by the green laser tube into a single-mode fiber. The laser emitted by the LD with a wavelength of 510-535nm, a light-emitting area of ​​2μm×6μm, and an output beam divergence angle (FWHM) of 22.5° in the Y direction and 6.3° in the X direction is focused into a 9.0μm×3μm spot at the receiving end face 4.88mm away from the light-emitting chip. This spot is then coupled with a single-mode fiber with a numerical aperture NA=0.15. The theoretical efficiency is calculated to be 89%, and the experimental maximum coupling efficiency is 85%.

[0022] 2. This utility model relates to a high-coupling-efficiency aspherical lens and a light source coupling module for shaping 510nm-535nm laser light sources. The aspherical lens, green laser tube, and green laser tube are packaged to form a light source coupling module, which has a small structure size and simple assembly. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a diagram of the green light shaping, coupling, and converging optical path of this utility model;

[0025] Figure 2 This is a schematic diagram of an aspherical lens.

[0026] Figure 3 Installation diagram of green light shaping, coupling, and converging for the light source coupling module;

[0027] Figure 4 This is a diagram of the converged light spot at the light receiving point;

[0028] In the diagram: 1. Light emitting end, 2. Aspherical lens, 21. Front surface, 22. Side surface, 23. Rear surface, 3. Light receiving end, 4. Single-mode fiber, 5. Green laser tube, 51. Light-emitting chip, 6. Encapsulation shell, 7. Protective glass. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model 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 of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] like Figure 1 As shown, an aspherical lens with high coupling efficiency is used for shaping 510nm-535nm laser sources. The aspherical lens 2 consists of a front surface 21, a side surface 22, and a rear surface 23, arranged sequentially from the light emitter 1 to the light receiver 3. The aspherical lens 2 focuses a laser beam with a wavelength of 510-535nm, a light-emitting surface size of 2μm × 6μm, and an output beam divergence angle of 22.5° in the Y direction and 6.3° in the X direction at the light receiver 4.88mm from the light emitter into a 9.0μm × 3μm spot. This spot is then coupled to a single-mode fiber 4 with a vertical aperture NA = 0.15. The theoretical efficiency is 89%, and the experimental maximum coupling efficiency is 85%. After transmission through the single-mode fiber, the beam forms a conical beam with a light-emitting area of ​​9μm and a light-emitting angle of 17°. After passing through a collimating lens with an aperture of f10mm, the conical beam forms a collimated beam with a divergence angle of 0.9mrad and a spot size of φ5.5mm at 6m.

[0033] Both the front surface 21 and the rear surface 23 are aspherical surfaces, and their surface shape is an even-order aspherical surface of the highest order 10, with the following equation:

[0034] ,in ;

[0035] In the formula, Taking the intersection of each aspherical surface and the optical axis as the starting point, along the axial direction of the optical axis, k is the conic coefficient, and c is the central curvature of the mirror surface. Let be the radius of curvature in the mirror, and r be the vertical height of a point on the mirror surface. , , , , The coefficients of higher-order terms in the aspherical formula are shown in the table below:

[0036] Aspheric coefficient , , , , The possible values ​​of:

[0037]

[0038] like Figure 3 As shown, specifically, the front surface 21 is a forward-convex aspherical surface, the rear surface 23 is a backward-convex aspherical surface, and the side surface 22 is a cylindrical surface with a diameter of 2.5 mm.

[0039] The distance between the vertex of the front surface 21 and the vertex of the rear surface 23 is the center thickness of the lens, which is 1.3 ± 0.02 mm.

[0040] Preferably, the light-transmitting aperture of the front surface 21 is 1.2 mm, and the light-transmitting aperture of the rear surface 23 is 1.6 mm.

[0041] Preferably, the lens is made of D-ZLaF50 glass, which has a refractive index of 1.8 for light beams with wavelengths of 510-535nm.

[0042] Preferably, a protective glass 7 is provided between the front surface 21 and the light emitting end 1, the distance between the protective glass 7 and the vertex of the front surface 21 is 0.74 mm, and the thickness of the protective glass 7 is 0.3 mm.

[0043] like Figure 4 As shown in the figure, the shape of the light spot is consistent with the shape of the light-emitting surface, and most of the light falls within the diameter of the fiber core.

[0044] like Figure 3As shown, a light source coupling module includes the aforementioned aspherical lens 2. The optical axis of the aspherical lens 2, the light-emitting chip 51 of the green laser tube 5, and the core of the single-mode optical fiber 4 are aligned with the module's packaging lines. One end of the green laser tube 5, the aspherical lens 2, and the single-mode optical fiber are encapsulated within a packaging shell 6. The aspherical lens 2, the single-mode optical fiber, and the packaging shell are connected by adhesive dispensing.

[0045] The specific sealing process is as follows: Align the light-emitting chip in the green laser tube 1 with the optical axis (X-axis) of the aspherical lens 2, and align the core of the single-mode fiber with the module's packaging line. Fix the laser tube 1 or the coupling lens 2, move the coupling lens or the laser tube to keep the optical axis aligned, and fix it with adhesive. Move the single-mode fiber to the focal point position to ensure that the focused light can completely enter the fiber, and then fix the fiber with adhesive.

[0046] The aspherical lens 2 focuses a laser beam emitted by the LD (510-535nm wavelength, 2μm×6μm emitting area, FWHM divergence angle (22.5° in the Y direction and 6.3° in the X direction) into a 9.0μm×3μm spot at a receiving end face 4.88mm away from the light-emitting chip. This spot is then coupled to a single-mode fiber with a numerical aperture (NA) of 0.15. The theoretical efficiency is 89%, and the experimental maximum coupling efficiency is 85%. After transmission through the single-mode fiber, a conical beam with a 9μm emitting area and a 17° emission angle is formed. After passing through a 10mm collimating lens, a collimated beam with a divergence angle of 0.9mrad is formed, resulting in a φ5.5mm spot size at 6m. The structure is small in size and simple to assemble.

[0047] In summary, this invention provides a high-coupling-efficiency aspherical lens and a light source coupling module for shaping 510nm-535nm laser light sources. The aspherical lens couples the light emitted by the green laser tube into a single-mode optical fiber.

[0048] The above description is based on the preferred embodiments of this utility model. Through the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. A high coupling efficiency aspherical lens for 510nm-535nm laser light source shaping, characterized in that, The aspherical lens (2) consists of a front surface (21), a side surface (22), and a rear surface (23) from the light emitting end (1) to the light receiving end (3). The aspherical lens (2) focuses a laser with a wavelength of 510-535nm, a light emitting surface size of 2μm×6μm, and an output beam divergence angle of 22.5° in the Y direction and 6.3° in the X direction at the light receiving end (3) 4.88mm away from the light emitting end (1) into a light spot of 9.0μm×3μm. It is coupled with a single-mode fiber (4) with a vertical aperture of NA=0.

15. After transmission through the single-mode fiber (4), it forms a conical beam with a light emitting area of ​​9μm and a light emitting angle of 17°. Both the front surface (21) and the rear surface (23) are aspherical surfaces, and their surface shape is an even-order aspherical surface of the highest order 10, with the equation: wherein ; In the formula, Taking the intersection of each aspherical surface and the optical axis as the starting point, along the axial direction of the optical axis, k is the conic coefficient, and c is the central curvature of the mirror surface. Let be the radius of curvature in the mirror, and r be the vertical height of a point on the mirror surface. , , , , The coefficients of higher-order terms in the aspherical formula are shown in the table below: Aspheric coefficient , , , , The possible values ​​of: 。 2. The high coupling efficiency aspherical lens for 510nm-535nm laser source shaping according to claim 1, characterized in that, The front surface (21) is a convex aspherical surface, the rear surface (23) is a convex aspherical surface, and the side surface (22) is a cylindrical surface with a diameter of 2.5 mm.

3. The high coupling efficiency aspherical lens for 510nm-535nm laser source shaping according to claim 1, characterized in that, The distance between the vertex of the front surface (21) and the vertex of the rear surface (23) is the center thickness of the lens, which is 1.3 ± 0.02 mm.

4. The high coupling efficiency aspherical lens for 510nm-535nm laser source shaping according to claim 1, characterized in that, The light-transmitting aperture of the front surface (21) is 1.2 mm, and the light-transmitting aperture of the rear surface (23) is 1.6 mm.

5. The high coupling efficiency aspherical lens for 510nm-535nm laser source shaping according to claim 1, characterized in that, The lens is made of D-ZLaF50 glass, and its refractive index is 1.8 for light beams with wavelengths of 510-535nm.

6. The high coupling efficiency aspherical lens for 510nm-535nm laser source shaping according to claim 1, characterized in that, A protective glass (7) is provided between the front surface (21) and the light emitting end (1). The distance between the protective glass (7) and the vertex of the front surface (21) is 0.74 mm, and the thickness of the protective glass (7) is 0.3 mm.

7. A light source coupling module, characterized by The aspherical lens included in any one of claims 1-6, wherein the optical axis of the aspherical lens (2), the light-emitting chip of the green laser tube (5), the core of the single-mode fiber (4) and the packaging line of the module are aligned, and one end of the green laser tube (5), the aspherical lens and the single-mode fiber (4) are encapsulated in the packaging shell (6).

8. The light source coupling module according to claim 7, characterized in that, The aspherical lens, single-mode optical fiber (4), and encapsulation shell (6) are connected by adhesive dispensing.

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