COMBINED LENSES-BASED APPARATUS FOR LINE LASER UNIFORMITY GENERATION

Abstract

Disclosed is a combined lenses-based apparatus for line laser uniformity generation. The apparatus includes a laser diode, and an aspheric focusing lens and combined lenses that are arranged behind the laser diode sequentially. The combined lenses include a cylindrical lens and a plano-convex cylindrical lens. The cylindrical lens and the plano-convex cylindrical lens are arranged on an optical path sequentially. One end surface of the aspheric focusing lens is an aspheric surface. Light emitted by the laser diode is focused by passing though the aspheric focusing lens, and the combined lenses are able to disperse a focused beam into uniform line laser.

Claims

1. A combined lenses-based apparatus for line laser uniformity generation, comprising: a laser diode (1), and an aspheric focusing lens (2) and combined lenses (3) that are arranged behind the laser diode (1) sequentially, the combined lenses (3) comprising a cylindrical lens (21) and a plano-convex cylindrical lens (22), the cylindrical lens (21) and the plano-convex cylindrical lens (22) being arranged on an optical path sequentially, one end surface of the aspheric focusing lens (2) being an aspheric surface, light emitted by the laser diode (1) being focused by passing though the aspheric focusing lens (2), and the combined lenses (3) dispersing a focused beam into uniform line laser.

2. The combined lenses-based apparatus of claim 1, wherein the cylindrical lens (21) is coaxial with the plano-convex cylindrical lens (22), the cylindrical lens (21) disperses a laser beam into line laser, and the plano-convex cylindrical lens (22) focuses light diverging from two ends of a line light source to a middle, so as to uniformize the line laser with an uneven energy distribution.

3. The combined lenses-based apparatus of claim 1, wherein a convex surface or a flat surface of the plano-convex cylindrical lens (22) faces the cylindrical lens (21).

4. The combined lenses-based apparatus of claim 2, wherein a convex surface or a flat surface of the plano-convex cylindrical lens (22) faces the cylindrical lens (21).

5. The combined lenses-based apparatus of claim 1, wherein a laser linewidth decreases as a distance between the cylindrical lens (21) and the aspheric focusing lens (2) decreases, and the laser linewidth increases as the distance between the cylindrical lens (21) and the aspheric focusing lens (2) increases.

6. The combined lenses-based apparatus of claim 2, wherein a laser linewidth decreases as a distance between the cylindrical lens (21) and the aspheric focusing lens (2) decreases, and the laser linewidth increases as the distance between the cylindrical lens (21) and the aspheric focusing lens (2) increases.

7. The combined lenses-based apparatus of claim 1, wherein a detector (4) is provided on the optical path behind the plano-convex cylindrical lens (22), and a linewidth deceases as a distance between the plano-convex cylindrical lens (22) and the detector (4) decreases.

8. The combined lenses-based apparatus of claim 1, wherein the aspheric focusing lens (2) is made of an optical glass material D-ZK3.

9. The combined lenses-based apparatus of claim 1, wherein each of the cylindrical lens (21) and the plano-convex cylindrical lens (22) is made of an optical glass material BK7.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0015] FIG. 1 is a schematic diagram showing a structure of a plano-convex cylindrical lens with a convex surface facing a cylindrical lens according to the present disclosure;

[0016] FIG. 2 is a schematic diagram showing a structure of a plano-convex cylindrical lens with a flat surface facing a cylindrical lens according to the present disclosure;

[0017] FIG. 3 is a schematic diagram showing a structure of a cylindrical lens according to the present disclosure;

[0018] FIG. 4 is a schematic diagram showing a structure of a plano-convex cylindrical lens according to the present disclosure;

[0019] FIG. 5 is a schematic diagram showing a linelength optical path of a plano-convex cylindrical lens with a convex surface facing a cylindrical lens according to the present disclosure;

[0020] FIG. 6 is a schematic diagram showing a linelength optical path of a plano-convex cylindrical lens with a flat surface facing a cylindrical lens according to the present disclosure;

[0021] FIG. 7 is a schematic diagram showing a linewidth optical path according to the present disclosure;

[0022] FIG. 8 is a test graph of lateral distribution of a beam according to the present disclosure; and

[0023] FIG. 9 is a test graph of longitudinal distribution of a beam according to the present disclosure.

[0024] 1—laser diode; 2—aspheric focusing lens; 3—combined lenses; 4—detector; 21—cylindrical lens; 22—plano—convex cylindrical lens

DESCRIPTION OF EMBODIMENTS

[0025] The present disclosure will be further described in detail below in combination with the accompanying drawings.

[0026] Referring to FIGS. 1-2, the present disclosure includes a laser diode 1, an aspheric focusing lens 2 and combined lenses 3 in structure. After light emitted by the laser diode 1 is focused by the aspheric focusing lens 2, the combined lenses 3 disperse a beam into uniform line laser. The laser diode 1 is a standard optoelectronic device with high electro-optical conversion efficiency. One end surface of the aspheric focusing lens 2 is an aspheric surface, and a material of the aspheric focusing lens 2 is D-ZK3. The combined lenses 3 include a cylindrical lens 21 and a plano-convex cylindrical lens 22, which are all made of BK7.

[0027] Referring to FIGS. 3-4, the combined lenses 3 of the present disclosure include the cylindrical lens 21 and the plano-convex cylindrical lens 22. The cylindrical lens 21 is coaxial with the plano-convex cylindrical lens 22. A convex surface or a flat surface of the plano-convex cylindrical lens 22 faces the cylindrical lens 21. The cylindrical lens 21 disperses a laser beam into line laser. The plano-convex cylindrical lens 22 may focus light diverging from two ends of a line light source to a middle, so that energy distribution of the entire line light source is uniform. A distance between the cylindrical lens 21 and the plano-convex cylindrical lens 22 may be determined based on requirements of an entire optical system. The cylindrical lens 21 and the plano-convex cylindrical lens 22 follow the following rules: a laser linewidth decreases as a distance between the cylindrical lens 21 and the aspheric focusing lens 2 decreases, and the laser linewidth increases as the distance between the cylindrical lens 21 and the aspheric focusing lens 2 increases; and a linewidth deceases as a distance between the plano-convex cylindrical lens 22 and the detector decreases.

[0028] Referring to FIGS. 5-6, according to the present disclosure, the laser light emitted by the laser diode 1 is focused by the aspheric focusing lens 2, and then passes through the combined lenses 3. The cylindrical lens 21 in the combined lenses 3 diverges the laser beam into the line laser. The plano-convex cylindrical lens 22 makes the line laser with uneven energy distribution uniform, and finally irradiates the line laser on the detector 4.

[0029] Referring to FIG. 7, linewidth distribution of the entire optical system of the present disclosure is basically determined by the aspheric focusing lens 2. The laser beam emitted by the laser diode 1 is focused by the aspheric focusing lens 2, passes through the combined lenses 3, and reaches the detector 4. During this period, an optical path of the beam does not change significantly. The linewidth is the thinnest at a focal length of the entire optical system. The farther from the focal length, the wider the linewidth.

[0030] Referring to FIG. 8, an analysis of a detection result of the detector 4 shows that energy distribution of the beam is basically uniform except for beam at a small distance from each of two ends of the beam. Referring to FIG. 9, beam energy distribution is concentrated, and there is only one peak. Consequently, the beam quality is excellent.

[0031] The above description is merely preferred embodiments of the present disclosure, and is not used to limit solutions in any form. It can be appreciated by those skilled in the art that, without departing from the spirit and principle of the present disclosure, modifications and replacements may be performed on the technical solutions in a number of simple ways. These modifications and replacements also fall within the protection scope defined by the attached claims.