A carbon dioxide laser etched CPS device

Abstract

The utility model relates to the technical field of cladding light stripper, disclose a kind of CPS device of carbon dioxide laser etching, including optical fiber and the packaging assembly of the optical fiber outside, gradually include coating, optical fiber cladding and core from outside to inside along the radial direction of the optical fiber, the coating is stripped, and etching portion is formed on the outer circumferential surface of the optical fiber cladding by carbon dioxide laser etching, and the etching portion includes the several round holes of array arrangement, and the diameter of the round hole gradually increases along the light propagation direction.

Description

Technical Field

[0001] This utility model relates to the field of cladding optical stripper technology, and in particular to a CPS device for carbon dioxide laser etching. Background Technology

[0002] In high-power fiber lasers and amplifiers, pump light and signal light exchange energy within doped fiber, resulting in pump attenuation and signal enhancement. However, not all pump energy is absorbed; some remains and propagates in the outer cladding of the double-clad fiber. This energy is not only unwanted but can also damage downstream devices. CPS (Clad Light Stripper) effectively strips the remaining pump power ASE and some reflected signal from the inner cladding of the double-clad fiber, thus protecting downstream devices. The principle of CPS is to utilize the refractive index distribution of the fiber to guide the beam from the core to the cladding. Through interaction with the outside environment via the cladding, the beam's energy gradually weakens until it is completely absorbed.

[0003] There are many methods for removing cladding light, including coating with high-refractive-index light-guiding materials, hydrofluoric acid etching, and soft metal filling. Currently, the most commonly used methods in industry are hydrofluoric acid etching and carbon dioxide laser grooving. However, the strength of optical fibers treated by chemical etching and grooving methods is greatly affected, resulting in decreased strength and increased susceptibility to breakage. Furthermore, the chemical solvents used in chemical etching methods are toxic and can be harmful to human health. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a CPS device etched by carbon dioxide laser, which has good consistency and reduces environmental pollution.

[0005] The technical solution of this utility model is as follows: a CPS device etched by carbon dioxide laser, including an optical fiber and an encapsulation assembly sleeved on the optical fiber. The optical fiber includes a coating layer, an optical fiber cladding and a fiber core in sequence from the outside to the inside along the radial direction of the optical fiber. The coating layer is stripped off, and an etched part is formed on the outer circumferential surface of the optical fiber cladding by carbon dioxide laser etching. The etched part includes a plurality of circular holes arranged in an array, and the diameter of the circular holes gradually increases along the light propagation direction.

[0006] As can be seen from the above scheme, the etching part is formed by drilling 360 degrees on the optical fiber with a carbon dioxide laser to form CPS. The advantages of this scheme using carbon dioxide laser etching are that it is safe, environmentally friendly, easy to operate, easy to clean, leaves no residue, and has good consistency. Compared with chemical corrosion, photolithography has stronger mechanical stress and is less prone to breakage during operation.

[0007] The optical fiber cladding is made of quartz material.

[0008] The encapsulation assembly includes a quartz tube and an encapsulation housing. The quartz tube is sleeved over the optical fiber, and the encapsulation housing is sleeved on and fixed to the quartz tube. The etched portion is located inside the quartz tube. Therefore, the encapsulation housing is used to encapsulate the etched optical fiber to form a CPS device.

[0009] The encapsulation housing and the quartz tube are connected by UV curing.

[0010] The encapsulation shell is made of metal. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a schematic diagram of another embodiment of the present invention;

[0013] Figure 3 This is a cross-sectional view of the present invention;

[0014] Figure 4 This is a schematic diagram of the packaged structure of this utility model;

[0015] Figure 5 This is a cross-sectional view of the present invention. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] like Figures 1 to 5 As shown, this utility model is a CPS device etched by carbon dioxide laser, including an optical fiber 1 and an encapsulation assembly sleeved on the optical fiber 1. Along the radial direction of the optical fiber 1, from the outside to the inside, it includes a coating layer 2, an optical fiber cladding 3, and a fiber core 4. The refractive index of the optical fiber cladding 3 is different from that of the fiber core 4. The coating layer 2 is removed. An etched part 5 is formed on the outer circumferential surface of the optical fiber cladding 3 by carbon dioxide laser etching. The etched part 5 includes a plurality of circular holes 51 arranged in an array. The diameter of the circular holes 51 gradually increases along the light propagation direction.

[0018] In this embodiment, during etching, the carbon dioxide laser beam is first extended to approximately 10 mm and then focused onto a small spot with a diameter of approximately 60 μm. The focused laser beam provides sufficient power density to directly ablate the fiber cladding 3 of the optical fiber. The etching section 5 includes a small hole section 52, a medium hole section 53, and a large hole section 54 arranged sequentially along the light propagation direction. Each of the small hole section 52, medium hole section 53, and large hole section 54 includes a plurality of circular holes 51. The larger the hole diameter, the greater the stripping power; the deeper the hole depth, the greater the stripping power; and the denser the hole spacing, the greater the stripping power. By setting certain hole diameters, depths, and spacing densities, different stripping effects can be achieved, while simultaneously reducing the stripping temperature.

[0019] The existing laser ring grooving process results in an uneven appearance and burrs, which affects the strength of the optical fiber and causes a high temperature rise. In order to avoid continuous damage to the surface of the optical fiber cladding, this solution uses a carbon dioxide laser spiral drilling process to achieve the optical stripping effect.

[0020] The encapsulation assembly includes a quartz tube 6 and an encapsulation housing 7. The quartz tube 6 is sleeved outside the optical fiber 1, and the encapsulation housing 7 is sleeved on the quartz tube 6 and fixed to the quartz tube 6. The etched part 5 is located inside the quartz tube 6.

[0021] The encapsulation housing 7 and the quartz tube 6 are connected by UV curing. The encapsulation housing 7 is made of metal.

[0022] In one embodiment, such as Figure 1 As shown, this is a CPS device with unidirectional stripping. Light propagates in one direction. As the aperture size increases, more and more cladding is stripped, and the stripping temperature increases from low to high, with the last region being the highest temperature region. The stripping power decreases from slow to fast.

[0023] In one embodiment, such as Figure 2 The image shows a bidirectional stripping CPS device. The stripping process involves changing the hole diameter from small to medium to large to medium to small, and the stripping temperature also changes accordingly: low to medium to high to medium to low. With complete stripping of the cladding light in both directions, the bidirectional temperature control is superior. The stripping power changes from slow to fast to slow.

[0024] In another embodiment, fiber 1 is a triple-clad fiber used as the gain fiber in the fiber laser. The fiber cladding 3 includes an inner cladding and an outer cladding covering the outside of the inner cladding. Since the pump light is transmitted in the inner cladding of the fiber, and the triple-clad fiber uses quartz material as the outer cladding, when manufacturing the pump stripper, the quartz outer cladding needs to be completely destroyed before the inner cladding is processed.

[0025] The workflow of this utility model is as follows: A section of the coating layer 2 is removed from the optical fiber 1, and the fiber is cleaned. Then, the optical fiber is placed under a CO2 laser, the laser parameters are adjusted, and laser output begins to drill holes in the cladding 3 of the optical fiber 1. After drilling the 0-degree surface of the optical fiber 1, it is rotated 90-180-270 degrees until the 360-degree hole is completed, forming a CPS device. The process involves encapsulation, and then the etched optical fiber is passed through a quartz tube 2. The coating layer 2 at both ends of the etched optical fiber 1 is cured with UV adhesive between the two ends of the quartz tube 6. After obtaining the semi-finished optical fiber cladding filter, it is passed through a metal outer seal 3, and the two ends of the quartz tube 2 are cured with UV adhesive between the two ends of the metal outer seal 3, thus obtaining the optical fiber cladding filter.

[0026] Finally, it should be emphasized that the above description is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A carbon dioxide laser-etched CPS device, comprising an optical fiber (1) and an encapsulation assembly sleeved outside the optical fiber (1), characterized in that: The fiber (1) includes a coating layer (2), an optical fiber cladding (3) and a fiber core (4) in the radial direction from the outside to the inside. The coating layer (2) is stripped off. An etched part (5) is formed on the outer circumferential surface of the optical fiber cladding (3) by carbon dioxide laser etching. The etched part (5) includes a plurality of circular holes (51) arranged in an array. The diameter of the circular holes (51) gradually increases along the direction of light propagation.

2. The CPS device etched by carbon dioxide laser according to claim 1, characterized in that: The optical fiber cladding (3) is made of quartz material.

3. The CPS device etched by carbon dioxide laser according to claim 1, characterized in that: The encapsulation assembly includes a quartz tube (6) and an encapsulation housing (7). The quartz tube (6) is sleeved outside the optical fiber (1), and the encapsulation housing (7) is sleeved on the quartz tube (6) and fixed to the quartz tube (6). The etched part (5) is located inside the quartz tube (6).

4. The CPS device etched by carbon dioxide laser according to claim 3, characterized in that: The encapsulation housing (7) and the quartz tube (6) are connected by UV curing.

5. A CPS device etched by carbon dioxide laser according to claim 3, characterized in that: The encapsulation housing (7) is made of metal.

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