CN115849700B - A method for preparing all-solid-state large-mode-field chalcogenide glass photonic crystal optical fiber - Google Patents
A method for preparing all-solid-state large-mode-field chalcogenide glass photonic crystal optical fiber Download PDFInfo
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Abstract
本发明公开了一种全固态大模场硫系玻璃光子晶体光纤的制备方法，包括制备基底硫系玻璃复合套管、制备填充硫系玻璃棒、制备基底硫系玻璃束缚套管、制备硫系玻璃复合细棒、制备基底硫系玻璃细棒、组装光子晶体光纤预制棒和拉制光子晶体光纤。本发明全固态大模场硫系玻璃光子晶体光纤的制备方法可显著减少纤芯/包层界面上的缺陷，降低光纤的传输损耗。本发明可制备最大芯径～120μm的柔性全固态大模场硫系玻璃光子晶体光纤，光纤的最低传输损耗<1dB/m。
The present invention discloses a method for preparing an all-solid-state large-mode-field chalcogenide glass photonic crystal fiber, comprising preparing a base chalcogenide glass composite sleeve, preparing a filling chalcogenide glass rod, preparing a base chalcogenide glass binding sleeve, preparing a chalcogenide glass composite thin rod, preparing a base chalcogenide glass thin rod, assembling a photonic crystal fiber preform, and drawing a photonic crystal fiber. The method for preparing an all-solid-state large-mode-field chalcogenide glass photonic crystal fiber of the present invention can significantly reduce defects on the core/cladding interface and reduce the transmission loss of the optical fiber. The present invention can prepare a flexible all-solid-state large-mode-field chalcogenide glass photonic crystal fiber with a maximum core diameter of 120 μm, and the minimum transmission loss of the optical fiber is <1 dB/m.
Description
Technical Field
The invention belongs to the technical field of glass fiber preparation, and particularly relates to a preparation method of an all-solid-state large-mode-field chalcogenide glass photonic crystal fiber.
Background
Chalcogenide glasses are amorphous materials formed based on chalcogenides (S, se, te). The chalcogenide glass optical fiber has wide infrared spectrum range and high nonlinear coefficient, and has great application prospect in the fields of infrared laser transmission, thermal image transmission, nonlinear optics and the like. Among them, most infrared laser transmission and nonlinear optical applications require that the fiber be capable of single-mode transmission of higher laser power. The laser damage threshold is lower due to weaker chemical bonds forming the chalcogenide glass network structure. According to the report of the literature, the highest mid-infrared laser power which can be transmitted by the single-mode chalcogenide glass optical fiber at present is only 10W, and the used optical fiber is an As-S step-index optical fiber with the core diameter of 12 mu m.
Because the optical fiber material is damaged above a certain laser power density, one direct and effective solution for improving the transmissible laser power of a single-mode fiber is to adopt a large-mode-field optical fiber technology, namely to realize higher laser power output by increasing the field diameter (or area) of an optical fiber core mold under the condition that the input laser power density does not exceed the laser damage threshold of the optical fiber material. For example, when the core mode field diameter of the optical fiber is increased from commonly used 10 μm to 100 μm, the mode field area is increased by 100 times, and the transmissible laser power of the optical fiber can be increased by more than 1 order of magnitude. The key to large mode field fiber technology is that while increasing the mode field area of the fundamental mode LP 01, the Numerical Aperture (NA) of the fiber must be correspondingly reduced, otherwise, the large core would support the presence of a large number of higher order modes, thereby reducing the fiber output beam quality. Since chalcogenide glass is typically prepared by vacuum melt-quenching, the limit of the refractive index difference between the core and the cladding can be precisely controlled between 10 -2～10-3 by controlling the chemical composition of the core and the cladding. Therefore, it is technically difficult to ensure that a chalcogenide glass fiber with a core diameter of 40 μm or more can realize single-mode output in a conventional step-index fiber. To realize a large mode field single mode fiber with a core diameter of 40 μm or more, the refractive index difference between the core and the cladding must be precisely controlled to a level of 10 -3 (or less), which must be realized by Photonic Crystal Fiber (PCF) technology.
The currently reported large-mode-field chalcogenide glass PCF mainly comprises an air-filled solid PCF and an all-solid PCF (air holes are replaced by low-refractive index materials), and compared with the air-filled solid PCF, the all-solid PCF can avoid the collapse and deformation of the air holes in the preparation process, and has no problem that the air holes are polluted by the environment. In order to obtain a larger mode field diameter while maintaining good flexibility of the fiber, the number of turns of the cladding microstructure of the PCF needs to be reduced. Numerical simulation shows that when the cladding microstructure of the all-solid-state large-mode-area PCF is 2 circles, the ratio d/Λ of the diameter d of a filling column to the center distance Λ of two adjacent filling columns is required to be smaller than or equal to 0.45, and the maximum core diameter of the optical fiber is about 120 mu m in order to maintain the flexibility.
The sulfur glass PCF with full solid large mode field is generally prepared by adopting a heap pulling method, and the ratio of the inner diameter to the outer diameter of the sulfur glass sleeve used in the preparation process is equal to the value of d/Λ, so that the sulfur glass sleeve with the inner diameter to the outer diameter ratio less than or equal to 0.45 needs to be prepared. Studies have shown that the ultra-low numerical aperture NA of large mode field PCFs makes their waveguide properties very sensitive to small (10 -5 orders of magnitude) refractive index fluctuations at the core/cladding interface, and that non-uniform defects (such as fringes, bubbles, surface defects, etc.) in chalcogenide glass ferrules can form 10 -4～10-6 orders of magnitude refractive index fluctuations at the core/cladding interface of the optical fiber, tending to significantly increase the transmission loss of the optical fiber. Thus, the production of low loss large mode field chalcogenide glass PCFs requires the use of low defect chalcogenide glass bushings.
At present, the preparation of the chalcogenide glass sleeve mainly adopts three methods, namely 1) a mechanical drilling method, namely drilling along the axis of a glass rod and polishing the inner wall of the glass rod to obtain the sleeve, wherein the method can prepare the sleeve with the internal and external diameter ratio less than or equal to 0.5, but the obtained sleeve has more defects on the inner wall, 2) an extrusion method, namely extruding initial glass through a die to form the sleeve at the temperature near the softening temperature of the initial glass, wherein the method can prepare the sleeve with the internal and external diameter ratio between 0.2 and 0.7, but more stripes are usually present in the sleeve obtained by the method, impurities are easy to introduce in the extrusion process, and 3) a coil method, namely rotating a quartz tube clamp filled with glass melt on a coil machine at high speed to form the sleeve, wherein the sleeve with the internal and external diameter ratio between 0.6 and 0.9 can be prepared by the method, and the sleeve obtained by the method has fewer stripes, good optical uniformity and smooth wall, but the method is difficult to prepare the chalcogenide glass sleeve with the internal and external diameter ratio less than 0.6.
In 2019, jiangsu university has adopted the heap method to prepare an ultra-large mode field all-solid-state chalcogenide glass PCF (Optics Letters,44 (2019) 5553-5556) with a mode field diameter of 80 μm at a wavelength of 4 μm, which has great potential in mid-infrared laser transmission and nonlinear optical applications. However, in the process of preparing the PCF, the extrusion method is adopted to prepare the chalcogenide glass sleeve with the internal-external diameter ratio less than or equal to 0.45, so that the prepared sleeve has more non-uniform defects, and the defects inevitably enter into the cladding microstructure of the PCF, and finally the prepared PCF shows higher transmission loss (5.2 dB/m@4 mu m), so that the PCF is difficult to transmit higher laser power.
Disclosure of Invention
Aiming at the problem of higher transmission loss of the all-solid-state large-mode-field chalcogenide glass PCF prepared by the prior art, the invention provides an improved preparation method, wherein a low-defect chalcogenide glass composite sleeve with an internal-external diameter ratio less than or equal to 0.45 is obtained by a coil technology in the process of preparing the PCF, and the defect on a fiber core/cladding interface is obviously reduced while the micro-structure size of the PCF is realized, so that the transmission loss of the PCF is obviously reduced.
The technical scheme of the invention is as follows:
a preparation method of an all-solid-state large-mode-field chalcogenide glass PCF comprises the following steps:
① Preparing a base chalcogenide glass composite sleeve:
The method comprises the steps of adopting a melting-quenching technology to synthesize substrate chalcogenide glass (with a refractive index of n 1) in a vacuum large quartz tube and a vacuum small quartz tube respectively, adopting a coil technology to prepare the substrate chalcogenide glass in the vacuum large quartz tube into a substrate chalcogenide glass sleeve A1 with inner and outer diameters of D2 and D1 respectively, preparing the substrate chalcogenide glass in the vacuum small quartz tube into a substrate chalcogenide glass sleeve A2 with inner and outer diameters of D 2 and D 1 respectively, cutting two ends of the vacuum large quartz tube and the vacuum small quartz tube respectively, pouring out the substrate chalcogenide glass sleeve A1 and the substrate chalcogenide glass sleeve A2, inserting the substrate chalcogenide glass sleeve A2 into the substrate chalcogenide glass sleeve A1 to form a substrate chalcogenide glass composite sleeve, wherein the inner diameter D 2 of the substrate chalcogenide glass sleeve A1 is larger than the outer diameter D 1 of the substrate chalcogenide glass sleeve A2, and the ratio of the inner diameter D 2 of the substrate chalcogenide glass sleeve A2 to the outer diameter D 1 of the substrate chalcogenide glass sleeve A1 is 0.4-0.45.
② Preparing a sulfur-filled glass rod:
And (3) synthesizing the filled chalcogenide glass (with the refractive index of n 2) in the vacuum quartz tube by adopting a melting-quenching technology, and cutting the two ends of the vacuum quartz tube to obtain the filled chalcogenide glass rod with the diameter of d 3. The refractive index n 2 of the filled chalcogenide glass is smaller than the refractive index n 1 of the substrate chalcogenide glass, and the diameter d 3 of the filled chalcogenide glass rod is smaller than the inner diameter d 2 of the substrate chalcogenide glass sleeve A2.
③ Preparing a base chalcogenide glass binding sleeve:
And extruding the synthesized base chalcogenide glass into a base chalcogenide glass binding sleeve by adopting an atmosphere protection extrusion technology, wherein the base chalcogenide glass binding sleeve is circular in shape, the inner hole is regular hexagon, and the diagonal length of the regular hexagon is d 4.
④ Preparing a sulfur-based glass composite thin rod:
And drawing the chalcogenide glass composite rod into a chalcogenide glass composite thin rod, wherein the diameter d 5 of the chalcogenide glass composite thin rod is smaller than 1/5 of the diagonal length d 4 of an inner hole of a substrate chalcogenide glass binding sleeve.
⑤ Preparing a substrate chalcogenide glass fine rod:
And drawing the substrate chalcogenide glass into a substrate chalcogenide glass thin rod, wherein the diameter d 6 of the substrate chalcogenide glass thin rod is equal to the diameter d 5 of the chalcogenide glass composite thin rod.
⑥ Assembling PCF preformed bars:
The method comprises the steps of arranging the chalcogenide glass composite thin rods in a substrate chalcogenide glass constraint sleeve in a close stacking mode, enabling the chalcogenide glass composite thin rods to be fully distributed in the internal space of the substrate chalcogenide glass constraint sleeve, and replacing one chalcogenide glass composite thin rod in the geometric center of the substrate chalcogenide glass constraint sleeve by the substrate chalcogenide glass thin rods, so that the PCF preform is obtained.
⑦ Drawing PCF
And drawing the PCF preform into the full-solid large-mode-field chalcogenide glass PCF.
Preferably, the difference D 2-d1 between the inner diameter D 2 of the base chalcogenide glass sleeve A1 and the outer diameter D 1 of the base chalcogenide glass sleeve A2 is less than or equal to 0.2mm.
Preferably, the difference d 2-d3 between the diameter d 3 of the thin rod of the filled chalcogenide glass and the inner diameter d 2 of the base chalcogenide glass sleeve A2 is less than or equal to 0.2mm.
Preferably, the relation between the diameter d 5 of the chalcogenide glass composite thin rod and the diagonal line length d 4 of the inner hole of the substrate chalcogenide glass binding sleeve is d 4-5d5 -0.4 mm.
Preferably, the fiber core diameter of the all-solid-state large-mode-area chalcogenide glass PCF is 60-120 mu m.
Preferably, the difference n 1-n2 between the refractive index n 1 of the base chalcogenide glass and the refractive index n 2 of the filled chalcogenide glass is greater than 0.2.
Preferably, the softening temperature difference between the base chalcogenide glass and the filled chalcogenide glass is less than or equal to 10 ℃.
Preferably, the steps of drawing the chalcogenide glass composite thin rod, extruding the substrate chalcogenide glass binding sleeve, drawing the substrate chalcogenide glass thin rod and drawing the PCF are all carried out under the protection of nitrogen or argon.
The beneficial effects are that:
1. the invention prepares the sulfur-based glass thick sleeve and thin sleeve with low defects and matched size by means of a coil technology, inserts the thin sleeve into the thick sleeve to form the composite sleeve, and the internal-external diameter ratio value of the composite sleeve is easily smaller than or equal to 0.45.
2. The method can prepare the flexible all-solid-state large-mode-field chalcogenide glass PCF with the maximum core diameter of 120 mu m, and the minimum transmission loss of the optical fiber can be reduced to below 1dB/m, thereby meeting part of practical application requirements.
Drawings
FIG. 1 is a schematic cross-sectional view of an all-solid-state large-mode-area chalcogenide glass photonic crystal fiber of the present invention.
FIG. 2 is a schematic cross-sectional structure of an all-solid large mode field chalcogenide glass photonic crystal fiber preform of the present invention.
FIG. 3 is a cross-sectional scanning electron micrograph of an all-solid large mode area chalcogenide glass photonic crystal fiber prepared in example 1.
In the figure, 1-base chalcogenide glass, 2-filled chalcogenide glass, 3-base chalcogenide glass confinement tube, 4-chalcogenide glass composite thin rod, 5-base chalcogenide glass thin rod.
Detailed Description
The invention will be further described with reference to the drawings and specific examples, which should not be construed as limiting the scope of the invention.
As shown in FIG. 1, the all-solid-state large-mode-area chalcogenide glass PCF prepared by the method comprises a substrate chalcogenide glass 1 and a filled chalcogenide glass 2, wherein the refractive index n 1 of the substrate chalcogenide glass 1 and the refractive index n 2 of the filled chalcogenide glass meet n 1-n2 >0.2, the softening temperature difference of the substrate chalcogenide glass 1 and the filled chalcogenide glass 2 is less than or equal to 10 ℃, the filled chalcogenide glass 2 is embedded in the substrate chalcogenide glass 1 in a columnar shape and is arranged in a double-layer periodic manner along the central line of the substrate chalcogenide glass 1, the area surrounded by the inner-layer filled chalcogenide glass is the fiber core of an optical fiber, the double-layer periodic arrangement structure formed by the filled chalcogenide glass and the substrate chalcogenide glass together forms a cladding of the optical fiber, and the ratio d/Λ of the diameter d of a filled chalcogenide glass column to the interval Λ of two adjacent filled chalcogenide glass columns is 0.40-0.45. The preparation method of the optical fiber comprises the following steps:
① Preparing a base chalcogenide glass composite sleeve:
the method comprises the steps of adopting a melting-quenching technology to synthesize substrate chalcogenide glass 1 in a vacuum large quartz tube and a vacuum small quartz tube respectively, adopting a coil technology to prepare the substrate chalcogenide glass 1 in the vacuum large quartz tube into a substrate chalcogenide glass sleeve A1 with inner and outer diameters of D2 and D1 respectively, preparing the substrate chalcogenide glass 1 in the vacuum small quartz tube into a substrate chalcogenide glass sleeve A2 with inner and outer diameters of D 2 and D 1 respectively, cutting two ends of the vacuum large quartz tube and the vacuum small quartz tube respectively, pouring the substrate chalcogenide glass sleeve A1 and the substrate chalcogenide glass sleeve A2 out of the vacuum large quartz tube and the vacuum small quartz tube respectively, inserting the substrate chalcogenide glass sleeve A2 into the substrate chalcogenide glass sleeve A1 to form a substrate chalcogenide glass composite sleeve, wherein the difference D 2-d1 between the inner diameter D 2 of the substrate chalcogenide glass sleeve A1 and the outer diameter D 1 of the substrate chalcogenide glass sleeve A2 is less than or equal to 0.2mm, and the ratio between the inner diameter D 2 of the substrate chalcogenide glass sleeve A2 and the outer diameter D 1 of the substrate chalcogenide glass sleeve A1 is 0.45-0.45.
② Preparing a sulfur-filled glass rod:
The method comprises the steps of adopting a melting-quenching technology to synthesize the filled chalcogenide glass 2 in a vacuum quartz tube, cutting two ends of the vacuum quartz tube to obtain filled chalcogenide glass rods with the diameter of d 3, wherein the diameter d 3 of each filled chalcogenide glass rod is smaller than the inner diameter d 2 of a base chalcogenide glass sleeve A2, and the difference d 2-d3 between the diameter d 3 of each filled chalcogenide glass fine rod and the inner diameter d 2 of the base chalcogenide glass sleeve A2 is smaller than or equal to 0.2mm.
③ Preparing a base chalcogenide glass binding sleeve 3:
The method comprises the steps of adopting a melting-quenching technology to synthesize the base chalcogenide glass 1 in a vacuum quartz tube, adopting an atmosphere protection extrusion technology to extrude the synthesized base chalcogenide glass into a base chalcogenide glass constraint sleeve 3 (see figure 2) under the protection of nitrogen or argon, wherein the base chalcogenide glass constraint sleeve is circular in shape, the inner hole is regular hexagon, and the diagonal line length of the regular hexagon is d 4.
④ Preparing a chalcogenide glass composite thin rod 4:
The prepared filled chalcogenide glass rod is inserted into a substrate chalcogenide glass composite sleeve to form a chalcogenide glass composite rod, the chalcogenide glass composite rod is pulled under the protection of nitrogen or argon to form a chalcogenide glass composite thin rod 4 (see figure 2), and the relation between the diameter d 5 of the chalcogenide glass composite thin rod 4 and the diagonal line length d 4 of an inner hole of the substrate chalcogenide glass constraint sleeve 3 is d 4-5d5 -0.4 mm.
⑤ Preparation of a base chalcogenide glass thin rod 5:
Synthesizing the base chalcogenide glass 1 in a vacuum quartz tube by adopting a melting-quenching technology, and drawing the base chalcogenide glass 1 into a base chalcogenide glass thin rod 5 (see figure 2) under the protection of nitrogen or argon, wherein the diameter d 6 of the base chalcogenide glass thin rod 5 is equal to the diameter d 5 of the chalcogenide glass composite thin rod.
⑥ Assembling a photonic crystal optical fiber preform:
The chalcogenide glass composite thin rod 4 is arranged in the substrate chalcogenide glass confinement sleeve 3 in a close packing mode, so that the chalcogenide glass composite thin rod is fully distributed in the inner space of the substrate chalcogenide glass confinement sleeve 3, and one chalcogenide glass composite thin rod 4 in the geometric center of the substrate chalcogenide glass confinement sleeve 3 is replaced by the substrate chalcogenide glass thin rod 5, so that the photonic crystal optical fiber preform is obtained.
⑦ Drawing photonic crystal fiber
And drawing the photonic crystal fiber preform into the all-solid-state large-mode-field chalcogenide glass photonic crystal fiber with the fiber core diameter of 60-120 mu m under the protection of nitrogen or argon.
Example 1
In this example, the chemical composition of the base chalcogenide glass of the all-solid large mode field chalcogenide glass photonic crystal fiber was As 40S60, its refractive index at 4 μm wavelength was 2.414, its softening temperature was 262 ℃, the chemical composition of the filled chalcogenide glass was Ge 12As20S68, its refractive index at 4 μm wavelength was 2.210, its softening temperature was 272 ℃, and the ratio d/Λ of the diameter d of the filled chalcogenide glass column to the spacing Λ of two adjacent filled chalcogenide glass columns was 0.425. In the preparation of the optical fiber, the inner diameter and the outer diameter of the base chalcogenide glass sleeve A1 are respectively 13.0mm (D 2) and 19.0mm (D 1), the inner diameter and the outer diameter of the base chalcogenide glass sleeve A2 are respectively 8.1mm (D 2) and 12.9mm (D 1), the diameter of the filled chalcogenide glass rod is 8.0mm (D 3), the outer diameter of the base chalcogenide glass binding sleeve is 12.4mm, the diagonal length of the inner hole regular hexagon is 6.7mm (D 4), the diameter of the chalcogenide glass composite thin rod is 1.3mm (D 5), the diameter of the base chalcogenide glass thin rod is 1.3mm (D 6), the diameter of the drawn optical fiber is about 600 μm, and the corresponding fiber core diameter is about 100 μm.
The cross section of the optical fiber is observed by using a scanning electron microscope (JSM-6510), the transmission loss of the optical fiber is tested by adopting a truncation method, an optical parametric amplifier (Light Conversion Orphrus) is used as an infrared light source, and an infrared light beam mass analyzer (DATARAY WINCAMD-IR-BB) is used for detecting the output mode of the optical fiber.
The test results of this example are shown in FIG. 3, which is a cross-sectional scanning electron microscope photograph of an optical fiber finally prepared by this implementation, wherein the diameter of the optical fiber is 598.4 μm, the diameter of the fiber core is 99.8 μm, the diameter d of the filled chalcogenide glass column is 26.8 μm, the distance Λ between two adjacent filled chalcogenide glass columns is 63.3 μm, d/Λ is 0.423, the loss of the optical fiber at the wavelength of 3 μm is 0.48dB/m, the optical fiber output light spot is single mode, and the optical fiber has good flexibility, and the minimum bending radius is less than 9cm.
Example 2
In this example, the chemical composition of the base chalcogenide glass of the all-solid large mode field chalcogenide glass photonic crystal fiber is Ge 12As24Se64, the refractive index thereof at a wavelength of 4 μm is 2.603, the softening temperature thereof is 270 ℃, the chemical composition of the filled chalcogenide glass is Ge 10As24S66, the refractive index thereof at a wavelength of 4 μm is 2.603, the softening temperature thereof is 266 ℃, and the ratio d/Λ of the diameter d of the filled chalcogenide glass column to the spacing Λ of two adjacent filled chalcogenide glass columns is 0.40. In the preparation of the optical fiber, the inner diameter and the outer diameter of the base chalcogenide glass sleeve A1 are respectively 13.0mm (D 2) and 20.0mm (D 1), the inner diameter and the outer diameter of the base chalcogenide glass sleeve A2 are respectively 8.0mm (D 2) and 12.8mm (D 1), the diameter of the filled chalcogenide glass rod is 7.9mm (D 3), the outer diameter of the base chalcogenide glass binding sleeve is 13.6mm, the diagonal length of the inner hole regular hexagon is 7.3mm (D 4), the diameter of the chalcogenide glass composite thin rod is 1.4mm (D 5), the diameter of the base chalcogenide glass thin rod is 1.4mm (D 6), the diameter of the drawn optical fiber is about 720 μm, and the corresponding fiber core diameter is about 120 μm.
The cross section of the optical fiber is observed by using a scanning electron microscope (JSM-6510), the transmission loss of the optical fiber is tested by adopting a truncation method, an optical parametric amplifier (Light Conversion Orphrus) is used as an infrared light source, and an infrared light beam mass analyzer (DATARAY WINCAMD-IR-BB) is used for detecting the output mode of the optical fiber.
The test results of the embodiment show that the diameter of the optical fiber is 721.5 mu m, the diameter of the fiber core is 120.3 mu m, the diameter d of each filled chalcogenide glass column is 30.2 mu m, the distance lambda between two adjacent filled chalcogenide glass columns is 75.1 mu m, d/lambda is 0.402, the loss of the optical fiber at the wavelength of 3 mu m is 0.67dB/m, the output light spot of the optical fiber is in a single mode, and the optical fiber has good flexibility and the minimum bending radius of the optical fiber is smaller than 12cm.
Example 3
In this example, the chemical composition of the base chalcogenide glass of the all-solid large mode field chalcogenide glass photonic crystal fiber is Ge 10As18Sb10S62, the refractive index thereof at 4 μm wavelength is 2.386, the softening temperature thereof is 317 ℃, the chemical composition of the filled chalcogenide glass is Ge 18As10S72, the refractive index thereof at 4 μm wavelength is 2.126, the softening temperature thereof is 325 ℃, and the ratio d/Λ of the diameter d of the filled chalcogenide glass column to the spacing Λ of two adjacent filled chalcogenide glass columns is 0.45. In the preparation of the optical fiber, the inner diameter and the outer diameter of the base chalcogenide glass sleeve A1 are respectively 13.0mm (D 2) and 19.0mm (D 1), the inner diameter and the outer diameter of the base chalcogenide glass sleeve A2 are respectively 8.6mm (D 2) and 12.9mm (D 1), the diameter of the filled chalcogenide glass rod is 8.4mm (D 3), the outer diameter of the base chalcogenide glass binding sleeve is 12.0mm, the diagonal length of the inner hole regular hexagon is 7.4mm (D 4), the diameter of the chalcogenide glass composite thin rod is 1.4mm (D 5), the diameter of the base chalcogenide glass thin rod is 1.4mm (D 6), the diameter of the drawn optical fiber is about 330 μm, and the corresponding fiber core diameter is about 60 μm.
The cross section of the optical fiber is observed by using a scanning electron microscope (JSM-6510), the transmission loss of the optical fiber is tested by adopting a truncation method, an optical parametric amplifier (Light Conversion Orphrus) is used as an infrared light source, and an infrared light beam mass analyzer (DATARAY WINCAMD-IR-BB) is used for detecting the output mode of the optical fiber.
The test results of the embodiment show that the diameter of the optical fiber is 330.7 mu m, the diameter of the fiber core is 60.1 mu m, the diameter d of each filled chalcogenide glass column is 17.4 mu m, the distance lambda between two adjacent filled chalcogenide glass columns is 38.7 mu m, d/lambda is 0.45, the loss of the optical fiber at the wavelength of 3 mu m is 0.96dB/m, the output light spot of the optical fiber is in a single mode, and the optical fiber has good flexibility and the minimum bending radius of the optical fiber is smaller than 5cm.
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| CN101613176A (en) * | 2008-06-25 | 2009-12-30 | 史考特公司 | Be used for method, Glass tubing subassembly and application thereof in Glass tubing fixing glass pipe or the spirochetal position of glass stick |
| CN102976607A (en) * | 2011-09-06 | 2013-03-20 | 苏州佳因特光电科技有限公司 | Single-mode chalcogenide glass optical fiber and preparation method thereof |
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