Fiber laser integrated collimation optical device

Abstract

The invention provides a fiber laser integrated collimation optical device. According to the scheme, the fiber laser integrated collimation optical device comprises a fiber laser, a collimator tail optical fiber and a collimation optical device. Laser emitted by the fiber laser enters the collimation optical device through collimator tail optical fiber coupling and then outputs collimated laser. According to the scheme, the fiber laser integrated collimation optical device has effects of both an optical end cap and a laser collimator, the number of optical elements is reduced, the size of the optical collimator is reduced, and the interference to the fiber laser caused by laser scattering return light is reduced.

Description

technical field

[0001] The invention relates to laser application technology, in particular to an optical fiber laser integrated collimating optical device. Background technique

[0002] Because fiber laser has the advantages of high conversion efficiency, good beam quality, convenient thermal management, and compact structure, high-power fiber laser technology has developed rapidly. Has been commercialized. For an actual fiber laser system, the beam output from the fiber laser is generally expanded by a collimator system before being transmitted and applied. At present, the existing fiber collimators are separated from the output end of the fiber. For high-power fiber lasers, in order to reduce the loss at the output end and protect the end face of the fiber, a large-diameter quartz end cap is usually fused at the output end of the fiber. Coated on both ends of the end cap. Although the structure in which the fiber collimator is separated from the fiber output end is eas...

Examples

Embodiment 1

[0027] figure 1 It is a schematic diagram of the optical path structure of the fiber laser integrated collimating optical device of the present invention. In the figure, the collimator pigtail fiber 2 is welded together with the plane end of the plano-convex optical lens 3, and after the two are welded, they are assembled into the collimator protective sleeve 4 made of metal material, and the collimator protective sleeve 4 is bonded by viscose. fixed. The function of the collimator protective cover 4 is to protect the welding point between the pigtail 2 of the collimator and the plano-convex optical lens 3 from being damaged by external force. In use, the collimator pigtail fiber 2 is fused with the output end of the fiber laser 1 .

[0028] figure 1 Among them, fiber laser 1 uses a fiber with numerical aperture NA=0.06, a core diameter of 20 μm, a material of fused silica, a cladding diameter of 400 μm, an output laser wavelength of 1064 nm, and a beam quality of M 2 ≈1.5...

Embodiment 2

[0030] figure 2 It is a schematic diagram of the optical path structure of another fiber laser integrated collimating optical device in this embodiment. The basic structure of this embodiment is the same as that of Embodiment 1, the difference is: in Embodiment 1, the collimating device is a plano-convex optical thick lens; in this embodiment, the collimating device is still a plano-convex lens, but the appearance shape has Big change. The outer diameter of the special-shaped plano-convex optical lens 5 is divided into three parts, the diameter of the part close to the convex surface is 7.5 mm, and the diameter of the middle part is 5 mm. It is 1.5mm, and its diameter is selected to facilitate the automatic centering of the optical fiber fusion splicer, so as to ensure that the collimator pigtail optical fiber 2 and the special-shaped plano-convex optical lens 5 are fused together. During the processing of the special-shaped plano-convex optical lens, the three parts with d...

Embodiment 3

[0033] image 3 It is a schematic diagram of the optical path structure of another fiber laser integrated collimating optical device in this embodiment. The basic structure of this embodiment is the same as that of Embodiment 1, the difference is: in Embodiment 1, the collimating device is a plano-convex optical thick lens; in this embodiment, the collimating device is still a plano-convex lens, but the appearance shape has Big change. The outer diameter of the conical collimating lens 6 is 7.5mm, the diameter of the plane connecting the tapered tail end and the pigtail fiber 2 is 1mm, and the full angle of the conical shape is 20°. The shape selection of the conical collimating lens and the fiber connection part is mainly for convenience. The automatic centering of the optical fiber fusion splicer, and the yield rate of the fusion splicing of pigtail optical fiber 2 and conical collimating lens 6. During the processing of the conical collimating lens, the incident plane and...

technical field

[0001] The invention relates to laser application technology, in particular to an optical fiber laser integrated collimating optical device. Background technique

[0002] Because fiber laser has the advantages of high conversion efficiency, good beam quality, convenient thermal management, and compact structure, high-power fiber laser technology has developed rapidly. Has been commercialized. For an actual fiber laser system, the beam output from the fiber laser is generally expanded by a collimator system before being transmitted and applied. At present, the existing fiber collimators are separated from the output end of the fiber. For high-power fiber lasers, in order to reduce the loss at the output end and protect the end face of the fiber, a large-diameter quartz end cap is usually fused at the output end of the fiber. Coated on both ends of the end cap. Although the structure in which the fiber collimator is separated from the fiber output end is eas...

Examples

Embodiment 1

[0027] figure 1 It is a schematic diagram of the optical path structure of the fiber laser integrated collimating optical device of the present invention. In the figure, the collimator pigtail fiber 2 is welded together with the plane end of the plano-convex optical lens 3, and after the two are welded, they are assembled into the collimator protective sleeve 4 made of metal material, and the collimator protective sleeve 4 is bonded by viscose. fixed. The function of the collimator protective cover 4 is to protect the welding point between the pigtail 2 of the collimator and the plano-convex optical lens 3 from being damaged by external force. In use, the collimator pigtail fiber 2 is fused with the output end of the fiber laser 1 .

[0028] figure 1 Among them, fiber laser 1 uses a fiber with numerical aperture NA=0.06, a core diameter of 20 μm, a material of fused silica, a cladding diameter of 400 μm, an output laser wavelength of 1064 nm, and a beam quality of M 2 ≈1.5...

Embodiment 2

[0030] figure 2 It is a schematic diagram of the optical path structure of another fiber laser integrated collimating optical device in this embodiment. The basic structure of this embodiment is the same as that of Embodiment 1, the difference is: in Embodiment 1, the collimating device is a plano-convex optical thick lens; in this embodiment, the collimating device is still a plano-convex lens, but the appearance shape has Big change. The outer diameter of the special-shaped plano-convex optical lens 5 is divided into three parts, the diameter of the part close to the convex surface is 7.5 mm, and the diameter of the middle part is 5 mm. It is 1.5mm, and its diameter is selected to facilitate the automatic centering of the optical fiber fusion splicer, so as to ensure that the collimator pigtail optical fiber 2 and the special-shaped plano-convex optical lens 5 are fused together. During the processing of the special-shaped plano-convex optical lens, the three parts with d...

Embodiment 3

[0033] image 3 It is a schematic diagram of the optical path structure of another fiber laser integrated collimating optical device in this embodiment. The basic structure of this embodiment is the same as that of Embodiment 1, the difference is: in Embodiment 1, the collimating device is a plano-convex optical thick lens; in this embodiment, the collimating device is still a plano-convex lens, but the appearance shape has Big change. The outer diameter of the conical collimating lens 6 is 7.5mm, the diameter of the plane connecting the tapered tail end and the pigtail fiber 2 is 1mm, and the full angle of the conical shape is 20°. The shape selection of the conical collimating lens and the fiber connection part is mainly for convenience. The automatic centering of the optical fiber fusion splicer, and the yield rate of the fusion splicing of pigtail optical fiber 2 and conical collimating lens 6. During the processing of the conical collimating lens, the incident plane and...

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