A yellow light zero-heat quenching microcrystal composite glass optical fiber and a preparation method thereof

Abstract

This invention discloses a microcrystalline composite glass fiber with zero thermal quenching of yellow light and its preparation method; the cladding of the microcrystalline composite glass fiber is quartz glass, and the core is SiO2 composite Dy 3+ Doped Gd3ScGa4O 12 Microcrystalline glass. The fabrication process of this optical fiber includes: first, acid washing and drying of a quartz glass tube, followed by sealing one end with a tapered end; then, adding Gd... 3‑x ScGa4O 12 : x Dy 3+ A ceramic core rod is placed inside a quartz glass tube to form an optical fiber preform. Finally, the preform is drawn into fibers at high temperature to obtain the microcrystalline composite glass fiber with zero thermal quenching of yellow light. The microcrystalline composite glass fiber prepared by this invention can maintain stable yellow light emission under high-temperature conditions, with no thermal attenuation in intensity and no significant shift in the emission center, and can be used for Dy... 3+ Doped yellow fiber lasers provide an efficient and stable gain medium, which is conducive to the miniaturization of devices and is expected to enable direct output of high-power yellow lasers.

Description

Technical Field

[0001] This invention belongs to the field of optical fibers, specifically relating to a microcrystalline composite glass optical fiber with zero thermal quenching of yellow light and its preparation method. Background Technology

[0002] Visible light lasers with wavelengths ranging from approximately 565 to 590 nm have wide applications in laser medicine, lidar, and astronomical observation. For example, high-power, narrow-linewidth, and high-beam-quality 589 nm wavelength lasers can be used in adaptive optics technology in astronomical telescopes; ultra-narrow-linewidth 556 nm and 578 nm lasers can be used for secondary cooling, spin polarization, and clock transitions in ytterbium atomic optical lattice clocks, respectively. However, direct output of high-performance, high-power lasers is currently relatively difficult, mainly due to limitations in the gain performance of optical fibers.

[0003] Currently, Dy has achieved yellow light laser output. 3+ The mainstream gain fiber used in doped fiber lasers is still fluoride glass fiber (Electronics Letters, 2000, 36(16): 1386-1387; Solid State Lasers XX: Technology and Devices, 2011, 7912: 79120J; Optics Letters, 2019, 44(17):4423-4426; Optics Letters, 2022, 47(5): 1157-1160; Photonics Research, 2021, 9(4), 446-451.). Fluoride glass fiber is advantageous for achieving yellow light laser output due to its low phonon energy, but its chemical and thermal stability is poor (softening point is only about 260℃), and excessively high temperatures may even cause damage to the fiber structure (damage threshold as low as 10). 4 -10 5 W / cm 2 The scale (of the scale) has become a major bottleneck in practical applications. These factors severely restrict Dy 3+ Further improvements in the output power of Dy-doped fluoride fiber lasers. To find ways to improve these lasers, some research has emerged in the field. 3+Research on doped conventional silicate optical fibers mainly includes two categories: one is conventional silicate optical fibers (OSA Continuum, 2021, 4(11), 2845-2851; Applied Physics Express, 2022, 15(1):012002; Journal of Non-Crystalline Solids 2022, 577.), although they have a high laser thermal damage threshold (10 7 -10 8 W / cm 2 (on the order of magnitude), but the high phonon energy of quartz exacerbates multiphonon relaxation at elevated temperatures, leading to Dy³ + The significant ion thermal quenching effect and limited solubility lead to poor gain performance; secondly, Dy³ was proposed to improve performance. + While doped microcrystalline composite silicate glass fibers (Nanomaterials, 2023, 13(9):1558; OpticalMaterials Express 2024, 14(8): 2023-2031.) have improved luminescence performance, they still fail to fundamentally solve the core problem of thermal quenching. Using an external cooling system to alleviate heat accumulation would complicate the laser system structure, hindering device miniaturization.

[0004] In conclusion, developing novel yellow optical fibers that combine high gain with excellent thermal stability has become a key objective for further improving Dy³ optical fiber performance. + The output power and overall performance of doped fiber lasers are key factors. Currently, research in this field is still lacking and breakthroughs are urgently needed. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a microcrystalline composite glass optical fiber with zero thermal quenching and its fabrication method. This invention utilizes a core-fusion drawing method to fabricate the composite optical fiber. The resulting fiber has a cladding of quartz glass and a core of SiO2 composite Dy... 3+ Doped Gd3ScGa4O 12 Microcrystalline glass. This optical fiber is fully bonded with Gd3ScGa4O 12 :Dy 3+ Leveraging the high-temperature zero-thermal-quenching characteristic of crystals and the advantages of silicate optical fibers, such as good flexibility and high laser damage threshold, a microcrystalline composite glass fiber with zero-thermal-quenching yellow light emission was fabricated. This method has wide applicability, and the resulting microcrystalline composite glass fiber exhibits excellent high-temperature yellow light emission stability while maintaining low transmission loss, making it suitable for Dy... 3+ Doped yellow fiber lasers provide an efficient and stable gain medium, which is conducive to the miniaturization of devices and is expected to enable direct output of high-performance, high-power yellow lasers.

[0006] The microcrystalline composite glass fiber with zero thermal quenching of yellow light prepared by the present invention can still maintain stable yellow light emission under working conditions of up to 200°C, and the intensity does not undergo thermal decay, exhibiting zero thermal quenching performance, and the emission center does not shift significantly.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] This invention provides a microcrystalline composite glass fiber with zero thermal quenching of yellow light, wherein the cladding is quartz glass and the core is a SiO2 composite Dy 3+ Doped Gd3ScGa4O 12 Microcrystalline glass.

[0009] Preferred, Dy 3+ Doped Gd3ScGa4O 12 The chemical formula of glass-ceramics is Gd 3-x ScGa4O 12 : x Dy 3+ , x =0.01~0.10; Preferably, the core diameter of the microcrystalline composite glass fiber is 5~20 μm and the outer diameter of the cladding is 120~130 μm.

[0010] Preferably, when the operating temperature of the microcrystalline composite glass fiber is raised to 200°C under the pumping of the excitation source, the intensity of the yellow light emission can still remain unchanged.

[0011] This invention also provides a method for preparing a microcrystalline composite glass fiber with zero thermal quenching of yellow light, comprising the following steps: (1) Grind and sinter gadolinium oxide powder, gallium oxide powder, scandium oxide powder and dysprosium oxide powder together; (2) The powder sintered in step (1) is ground, pressed into shape, sintered at high temperature, and finally ground into a cylinder to obtain Gd. 3-x ScGa4O 12 : x Dy 3+ Fiber core ceramic rod; (3) Gd 3-x ScGa4O 12 : x Dy 3+ After being acid-washed and dried, the fiber core ceramic rod is placed in a quartz glass tube with one end sealed by a tapered end to obtain an optical fiber preform. (4) The optical fiber preform is drawn into fibers to obtain a microcrystalline composite glass fiber with zero thermal quenching of yellow light.

[0012] Preferably, in step (1), the sintering temperature is 1500~1600℃ and the time is 6~10 h.

[0013] Preferably, in step (2), the sintering temperature is 1500~1600 ℃ and the time is 6~10 h.

[0014] Preferably, in step (4), the temperature of wire drawing is 1950~2030 ℃.

[0015] Preferably, in step (4), the wire drawing is carried out in the high-temperature furnace of the wire drawing tower.

[0016] This invention also provides the application of the aforementioned microcrystalline composite glass fiber with zero thermal quenching in yellow light in yellow light fiber lasers.

[0017] Due to the adoption of the above technical solution, the present invention has the following positive effects and outstanding features compared with the prior art: (1) The present invention provides a microcrystalline composite glass fiber with zero thermal quenching of yellow light, which fully incorporates Gd3ScGa4O 12 :Dy 3 + The microcrystalline glass fiber, with its zero thermal quenching properties and the advantages of good flexibility and low laser threshold, has been used to produce a microcrystalline composite glass fiber with excellent luminescence thermal stability and strong yellow light emission. Even under working conditions with temperatures as high as 200℃, it can still maintain stable yellow light emission without thermal attenuation, exhibiting zero thermal quenching performance, and the luminescence center does not shift significantly.

[0018] (2) The present invention provides a microcrystalline composite glass fiber with zero thermal quenching of yellow light. Through material design, the cladding is made of quartz glass, which has good compatibility with existing optical fiber systems.

[0019] (3) The method for preparing a microcrystalline composite glass optical fiber with zero thermal quenching of yellow light according to the present invention has wide applicability and low cost in the preform preparation process. The composition of the core ceramic rod can be adjusted according to the application requirements. The fiber drawing process is mature and can be carried out using commercial drawing towers.

[0020] (4) The present invention provides a method for preparing a microcrystalline composite glass fiber with zero thermal quenching of yellow light. The microcrystalline composite glass fiber is prepared by core melting and drawing method, with a grain size of less than 10 nm, to ensure that the fiber maintains a low transmission loss.

[0021] (5) The microcrystalline composite glass fiber with zero thermal quenching of yellow light of the present invention can be used in yellow light fiber lasers, especially in small high-power yellow light fiber lasers. Attached Figure Description

[0022] Figure 1This is an optical micrograph of the end face of the microcrystalline composite glass fiber with zero thermal quenching of yellow light prepared in Example 1 of this invention.

[0023] Figure 2 This is the temperature-dependent visible emission spectrum of the yellow light zero-thermal quenching microcrystalline composite glass fiber prepared in Example 1 of this invention under semiconductor laser excitation.

[0024] Figure 3 This is the temperature-dependent visible emission spectrum of the yellow light zero-thermal quenching microcrystalline composite glass fiber prepared in Example 2 of this invention under semiconductor laser excitation.

[0025] Figure 4 This is the temperature-dependent visible emission spectrum of the yellow light zero-thermal quenching microcrystalline composite glass fiber prepared in Example 3 of this invention under semiconductor laser excitation.

[0026] Figure 5 This is a transmission electron microscope (TEM) image of the yellow light zero thermal quenching microcrystalline composite glass fiber prepared in Example 3 of this invention. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of protection thereof.

[0028] The quartz glass tube used in the embodiment was processed as follows: first, it was acid-washed and dried, and then one end was sealed by tapering.

[0029] Example 1 Gadolinium oxide powder (purity ≥99.9%), gallium oxide powder (purity ≥99.99%), scandium oxide powder (purity ≥99.99%), and dysprosium oxide powder (purity ≥99.99%) with a molar ratio of 2.99:1:4:0.01 were placed in a mortar and thoroughly ground. The mixed powder was then sintered in a muffle furnace at 1550 °C for 8 h. The pure phase Gd obtained after solid-phase synthesis was then... 2.99 ScGa4O 12 0.01Dy 3+ The sample was re-ground and then pressed into a strip block in a mold. The pressed sample was sintered in a muffle furnace at 1550 °C for 8 hours. Then, the sintered strip ceramic rod was ground into a cylinder with a diameter of 3.8 mm and a length of 6 cm. The fiber core ceramic rod was placed in a quartz glass tube with an inner diameter of 4 mm, an outer diameter of 25 mm, and a length of 20 cm to obtain an optical fiber preform. Subsequently, the preform was placed in a vacuum high-temperature graphite furnace in a drawing tower and drawn into a microcrystalline composite glass at a high temperature of 2030 °C, which is higher than the melting temperature of the fiber core material. This yielded a microcrystalline composite glass optical fiber with zero thermal quenching of yellow light. The core diameter of the microcrystalline composite glass optical fiber was 5 μm, and the outer diameter of the cladding was 120 μm.

[0030] The core-cladding structure of the yellow light zero thermal quenching microcrystalline composite glass fiber was observed using an optical microscope. The temperature-dependent emission spectrum of the yellow light zero thermal quenching microcrystalline composite glass fiber was tested using an OceanMaya2000 Pro fiber optic spectrometer and a temperature-dependent heating stage, with a 395 nm semiconductor laser as the excitation source.

[0031] Micrograph of the end face of the yellow light zero-thermal quenching microcrystalline composite glass fiber prepared in Example 1 is shown below. Figure 1 As shown, the microcrystalline composite glass fiber has a complete core-cladding structure and good interfacial contact between the core and cladding. These results indicate that this fiber can be used in yellow-light fiber lasers as a high-performance and stable gain medium. The temperature-dependent emission spectrum of the yellow-light zero-thermal-quenching microcrystalline composite glass fiber prepared in Example 1 is shown below. Figure 2 As shown, the microcrystalline composite glass fiber can still maintain stable yellow light emission under high temperature conditions, and the luminescence intensity at 200 ℃ can still maintain 91.6% (IL) of that at 25 ℃. 200 ℃ / I 25 ℃ Furthermore, the luminescence center shows no significant shift, which could be Dy. 3+ Doped yellow fiber lasers provide an efficient and stable gain medium, which is conducive to the miniaturization of devices and is expected to enable direct output of high-power yellow lasers.

[0032] Example 2 Gadolinium oxide powder (purity ≥99.9%), gallium oxide powder (purity ≥99.99%), scandium oxide powder (purity ≥99.99%), and dysprosium oxide powder (purity ≥99.99%) with a molar ratio of 2.90:1:4:0.1 were placed in a mortar and thoroughly ground. The mixed powder was then sintered in a muffle furnace at 1500 °C for 10 h. The resulting pure Gd oxide powder was then... 2.90 ScGa4O 12 0.10Dy 3+ The sample was re-ground and then pressed into a strip block in a mold. The pressed sample was sintered in a muffle furnace at 1500℃ for 10 hours. Then, the sintered strip ceramic rod was ground into a cylinder with a diameter of 3.8 mm and a length of 6 cm. The fiber core ceramic rod was placed in a quartz glass tube with an inner diameter of 4 mm, an outer diameter of 25 mm, and a length of 15 cm to obtain an optical fiber preform. Subsequently, the preform was placed in a vacuum high-temperature graphite furnace in a drawing tower and drawn into a microcrystalline composite glass fiber at a high temperature of 1950℃, which is higher than the melting temperature of the fiber core material. This yielded a microcrystalline composite glass fiber with zero thermal quenching of yellow light. The core diameter of the microcrystalline composite glass fiber was 15 μm, and the outer diameter of the cladding was 127 μm.

[0033] The temperature-dependent emission spectrum of the microcrystalline composite glass fiber with zero thermal quenching of yellow light was tested using an Ocean Maya2000 Pro fiber optic spectrometer and a temperature-dependent heating stage. The excitation source was a 395 nm semiconductor laser.

[0034] The temperature-varying emission spectrum of the yellow-light zero-thermal-quenching microcrystalline composite glass fiber prepared in Example 2 under blue-light semiconductor laser excitation is shown below. Figure 3 As shown, from Figure 3 It can be seen that the luminous intensity at 200 ℃ still retains 99.7% of that at 25 ℃ (I 200 ℃ / I 25 ℃ This achieves the most significant zero-thermal quenching effect in the various embodiments described in this invention, and the luminescence center does not undergo significant shift, compared to existing Dy... 3+ The light emission and thermal stability of doped optical fibers have significant advantages, which is beneficial for the direct output of high-power yellow light lasers and also for the miniaturization of yellow light fiber laser devices.

[0035] Example 3 Gadolinium oxide powder (purity ≥99.9%), gallium oxide powder (purity ≥99.99%), scandium oxide powder (purity ≥99.99%), and dysprosium oxide powder (purity ≥99.99%) with a molar ratio of 2.95:1:4:0.05 were placed in a mortar and thoroughly ground. The mixed powder was then sintered in a muffle furnace at 1600 ºC for 5 h. The resulting pure Gd oxide powder was then subjected to solid-phase synthesis. 2.95 ScGa4O 12 0.05Dy 3+ The sample was re-ground and then pressed into a strip block in a mold. The pressed sample was sintered in a muffle furnace at 1600℃ for 5 hours. Then, the sintered strip ceramic rod was ground into a cylinder with a diameter of 3.8 mm and a length of 6 cm. The fiber core ceramic rod was placed in a quartz glass tube with an inner diameter of 4 mm, an outer diameter of 25 mm, and a length of 15 cm to obtain an optical fiber preform. Subsequently, the preform was placed in a vacuum high-temperature graphite furnace in a drawing tower and drawn into a microcrystalline composite glass fiber at a high temperature of 2010℃, which is higher than the melting temperature of the fiber core material. This yielded a microcrystalline composite glass fiber with zero thermal quenching of yellow light. The core diameter of the microcrystalline composite glass fiber was 20 μm, and the outer diameter of the cladding was 130 μm.

[0036] The temperature-dependent emission spectrum of the yellow light zero-thermal-quenching microcrystalline composite glass fiber was tested using an Ocean Maya2000 Pro fiber optic spectrometer and a temperature-dependent heating stage, with a 395 nm semiconductor laser as the excitation source. The microstructure of nanocrystals in the yellow light zero-thermal-quenching microcrystalline composite glass fiber was observed using a FEI Talos F200x transmission electron microscope.

[0037] Transmission electron microscopy (TEM) image of the yellow light zero-thermal-quenching microcrystalline composite glass fiber prepared in Example 3 is shown below. Figure 4 As shown, Figure 4 The 'a' in the figure indicates that the crystals precipitated in the glass-ceramic fiber are nanocrystals with a diameter of 4~6 nm, and the nanocrystals are uniformly distributed. Figure 4 The b in the image is a high-resolution lattice fringe image, indicating the presence of Gd3ScGa4O in the fiber core. 12 :Dy 3+ Nanocrystals will not cause significant scattering loss, allowing the optical fiber to maintain low transmission loss. The temperature-dependent luminescence spectrum of the yellow light zero-thermal-quenching microcrystalline composite glass fiber prepared in Example 3 is as follows: Figure 5 As shown, the fabricated microcrystalline composite glass fiber can still maintain stable yellow light emission under high temperature conditions, and the luminescence intensity at 200 ℃ can still maintain 95.8% of that at 25 ℃ (I 200 ℃ / I 25 ℃ Furthermore, the luminescence center shows no significant shift, which could be Dy. 3+ Doped yellow fiber lasers provide an efficient and stable gain medium, which is conducive to the miniaturization of devices and is expected to enable direct output of high-power yellow lasers.

[0038] Example 4 Gadolinium oxide powder (purity ≥99.9%), gallium oxide powder (purity ≥99.99%), scandium oxide powder (purity ≥99.99%), and dysprosium oxide powder (purity ≥99.99%) with a molar ratio of 2.93:1:4:0.07 were placed in a mortar and thoroughly ground. The mixed powder was then sintered in a muffle furnace at 1500 °C for 8 h. The resulting pure Gd oxide powder was then subjected to solid-phase synthesis. 2.93 ScGa4O 12 0.07Dy 3+ The sample was re-ground and then pressed into a strip block in a mold. The pressed sample was sintered in a muffle furnace at 1600℃ for 10 hours. Then, the sintered strip ceramic rod was ground into a cylinder with a diameter of 3.8 mm and a length of 6 cm. The fiber core ceramic rod was placed in a quartz glass tube with an inner diameter of 4 mm, an outer diameter of 25 mm, and a length of 15 cm to obtain an optical fiber preform. Subsequently, the preform was placed in a vacuum high-temperature graphite furnace in a drawing tower and drawn into a microcrystalline composite glass fiber at a high temperature of 2010℃, which is higher than the melting temperature of the fiber core material. This yielded a microcrystalline composite glass fiber with zero thermal quenching of yellow light. The core diameter of the microcrystalline composite glass fiber was 8 μm, and the outer diameter of the cladding was 130 μm.

[0039] The microcrystalline composite glass fiber with zero thermal quenching of yellow light prepared in Example 4 has a complete core-cladding structure at its end face, and the interface contact between the core and cladding is good. This fiber can be used in yellow light fiber lasers as a high-performance and stable gain medium. The prepared microcrystalline composite glass fiber can still maintain stable yellow light emission under high temperature environment. The luminous intensity at 200 ℃ still retains 99.5% of that at 25 ℃, and the luminous center has no obvious shift. It can be used for Dy 3+ Doped yellow fiber lasers provide an efficient and stable gain medium, which is conducive to the miniaturization of devices and is expected to enable direct output of high-power yellow lasers.

[0040] Example 5 Gadolinium oxide powder (purity ≥99.9%), gallium oxide powder (purity ≥99.99%), scandium oxide powder (purity ≥99.99%), and dysprosium oxide powder (purity ≥99.99%) with a molar ratio of 2.97:1:4:0.03 were placed in a mortar and thoroughly ground. The mixed powder was then sintered in a muffle furnace at 1550 °C for 8 h. The resulting pure Gd oxide powder was then subjected to solid-phase synthesis. 2.97 ScGa4O 12 0.01Dy 3+ The sample was re-ground and then pressed into a strip block in a mold. The pressed sample was sintered in a muffle furnace at 1500 °C for 6 h. The sintered strip ceramic rod was then ground into a cylinder with a diameter of 3.8 mm and a length of 6 cm. The core ceramic rod was placed in a quartz glass tube with an inner diameter of 4 mm, an outer diameter of 25 mm, and a length of 20 cm to obtain an optical fiber preform. Subsequently, the preform was placed in a vacuum high-temperature graphite furnace in a drawing tower and drawn into a microcrystalline composite glass fiber at a high temperature of 2020 °C, which is higher than the melting temperature of the core material. This yielded a microcrystalline composite glass fiber with zero thermal quenching of yellow light. The core diameter of the microcrystalline composite glass fiber was 5.8 μm, and the outer diameter of the cladding was 127 μm.

[0041] The yellow-light zero-thermal-quenching microcrystalline composite glass fiber prepared in Example 5 possesses a complete core-cladding structure and good interfacial contact between the core and cladding. It can be used in yellow-light fiber lasers as a high-performance and stable gain medium. The prepared microcrystalline composite glass fiber maintains stable yellow-light emission even at high temperatures, with the luminescence intensity at 200 °C still maintaining 99.6% (IL) of that at 25 °C. 200 ℃ / I 25 ℃ Furthermore, the luminescence center shows no significant shift, which could be Dy. 3+ Doped yellow fiber lasers provide an efficient and stable gain medium, which is conducive to the miniaturization of devices and is expected to enable direct output of high-power yellow lasers.

[0042] The microcrystalline composite glass fiber with zero thermal quenching of yellow light prepared by this invention is similar to common Dy 3+ The comparison of luminescence quenching performance of doped crystals is as follows:

[0043] Note: I x℃ This refers to the intensity of yellow light emitted at x℃.

[0044] The above performance comparison demonstrates that the yellow light zero thermal quenching microcrystalline composite glass fiber prepared by this invention has excellent light quenching performance.

[0045] The above embodiments are preferred implementation methods of the present invention, but the implementation of the present invention is not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A microcrystalline composite glass optical fiber with zero thermal quenching of yellow light, characterized in that, Its cladding is quartz glass, and its core is a SiO2 composite Dy 3+ Doped Gd3ScGa4O 12 Microcrystalline glass.

2. The microcrystalline composite glass optical fiber with zero thermal quenching of yellow light according to claim 1, characterized in that, The Dy 3 + Doped Gd3ScGa4O 12 The chemical formula of glass-ceramics is Gd 3-x ScGa4O 12 : x Dy 3+ , x =0.01~0.

10.

3. The microcrystalline composite glass optical fiber with zero thermal quenching of yellow light according to claim 1, characterized in that, The core diameter of the microcrystalline composite glass fiber is 5~20 μm, and the outer diameter of the cladding is 120~130 μm.

4. The microcrystalline composite glass optical fiber with zero thermal quenching of yellow light according to claim 1, characterized in that, When the operating temperature of the microcrystalline composite glass fiber is raised to 200 ℃ under the pumping of the excitation source, the intensity of the yellow light emission remains unchanged.

5. A method for preparing a microcrystalline composite glass optical fiber with zero thermal quenching of yellow light as described in any one of claims 1-4, characterized in that, Includes the following steps: (1) Grind and sinter gadolinium oxide powder, gallium oxide powder, scandium oxide powder and dysprosium oxide powder together; (2) The powder sintered in step (1) is ground, pressed into shape, sintered at high temperature, and finally ground into a cylinder to obtain Gd. 3-x ScGa4O 12 : x Dy 3+ Fiber core ceramic rod; (3) Gd 3-x ScGa4O 12 : x Dy 3+ After being acid-washed and dried, the fiber core ceramic rod is placed in a quartz glass tube with one end sealed by a tapered end to obtain an optical fiber preform. (4) The optical fiber preform is drawn into fibers to obtain a microcrystalline composite glass fiber with zero thermal quenching of yellow light.

6. The preparation method according to claim 5, characterized in that, In step (1), the sintering temperature is 1500~1600℃ and the time is 6~10 h.

7. The preparation method according to claim 5, characterized in that, In step (2), the sintering temperature is 1500~1600 ℃ and the time is 6~10 h.

8. The preparation method according to claim 5, characterized in that, In step (4), the temperature of the wire drawing is 1950~2030 ℃.

9. The preparation method according to claim 5, characterized in that, In step (4), the wire drawing is carried out in the high-temperature furnace of the wire drawing tower.

10. The application of a microcrystalline composite glass fiber with zero thermal quenching as described in any one of claims 1-4 in a yellow fiber laser.

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