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A kind of preparation method of chalcogenide glass photonic crystal optical fiber preform rod

A technology of photonic crystal fiber and chalcogenide glass, applied in glass manufacturing equipment, glass production, manufacturing tools, etc., can solve the problems of hollow hole surface defects, restraint, and low success rate, so as to avoid voids and defects and improve processing efficiency , The effect of reducing fiber loss

Active Publication Date: 2019-10-25
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are main problems in this method: first, the connection and sealing problem between the preform and the vacuum system cannot be avoided, and the air pressure has large fluctuations; The temperature rises faster when it is in the hot zone, and the temperature will drop faster when it continues to fall out of the hot zone, and the capillary is prone to uneven heating, uneven expansion, and greater stress; the third is that the preform passes through the hot zone slowly, and the narrower the hot zone, the longer it takes
The main problem of this method is that there is a very large difference in expansion coefficient between chalcogenide glass and quartz glass, which makes the prefabricated panel accumulate a lot of stress and easily break
The drilling method is a common method for preparing various matrix photonic crystal fibers (CN201210535345.8). The main problem of this method is that the chalcogenide glass is extremely brittle, and the success rate of mechanical processing and ultrasonic processing is not high; in addition, The punching method is not easy to adjust the duty cycle, the number of layers of the hollow hole is severely limited and the inner surface of the hollow hole is seriously defective
In summary, the current preparation of chalcogenide photonic crystal fibers is severely restricted by the preparation of chalcogenide photonic crystal preforms

Method used

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  • A kind of preparation method of chalcogenide glass photonic crystal optical fiber preform rod
  • A kind of preparation method of chalcogenide glass photonic crystal optical fiber preform rod
  • A kind of preparation method of chalcogenide glass photonic crystal optical fiber preform rod

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Embodiment 1

[0025] To prepare chalcogenide glass photonic crystal optical fiber, the traditional melt cooling method is used to prepare chalcogenide glass materials. The sample preparation is through pretreatment of quartz ampoules, weighing of starting materials, vacuum sealing, melting, annealing, cutting, drilling hole and other processes to obtain the glass empty tube and the outer tube 1 of the corresponding duty cycle. Drawing is performed on the obtained chalcogenide glass empty tube, and the drawn optical fiber is required to have a uniform size, and the capillary 2 with a uniform size corresponding to the duty ratio is prepared by drawing.

[0026] Use an optical fiber cutter to cut off a capillary 2 with a moderate length, put the capillary 2 into a vacuum heating furnace, and then go through the initial slow vacuuming and the later molecular pump vacuuming to reach 1×10 -6 Pa pressure, while heating the capillary 2 to the glass transition temperature T g +20°C, keep warm for 2...

Embodiment 2

[0032] To prepare chalcogenide glass photonic crystal optical fiber, the traditional melt cooling method is used to prepare chalcogenide glass materials. The sample preparation is through pretreatment of quartz ampoules, weighing of starting materials, vacuum sealing, melting, annealing, cutting, drilling hole and other processes to obtain the glass empty tube and the outer tube 1 of the corresponding duty cycle. Drawing is performed on the obtained chalcogenide glass empty tube, and the drawn optical fiber is required to have a uniform size, and the capillary 2 with a uniform size corresponding to the duty ratio is prepared by drawing.

[0033] Use an optical fiber cutter to cut off a capillary 2 with a moderate length, put the capillary 2 into a vacuum heating furnace, and then go through the initial slow vacuuming and the later molecular pump vacuuming to reach 1×10 -6 Pa pressure, while heating the capillary 2 to the glass transition temperature T g -20°C, keep warm for 2...

Embodiment 3

[0038] With above-mentioned specific embodiment 1, its difference is:

[0039] The capillary is heated to the glass transition temperature T g °C; heat the chalcogenide glass photonic crystal primary preform to the glass transition temperature T g +110°C, keep warm and set for 1h.

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Abstract

The invention discloses a preparation method of a chalcogenide glass photonic crystal fiber preform. The preparation method is characterized by comprising the following steps: (1) preparing a chalcogenide glass material into a glass hollow tube by drilling, extruding or a direct tube rotating method, preparing capillaries with a corresponding duty cycle and even size by wire drawing, putting the capillaries into a vacuum heating furnace, vacuuming, heating and introducing inert gas in sequence, and fusing two ends of the capillaries to seal the capillaries; (2) stacking the capillaries into a polygonal or circular structure with the cross section being of a symmetric structure, fixing a stacked model by adopting solid glass rods or hollow tubes, and sleeving by using an outer sleeve prepared in advance, thus obtaining a chalcogenide glass photonic crystal primary preform; (3) vertically putting the whole primary preform into the vacuum heating furnace, and vacuuming, heating and introducing inert gas in sequence, thus obtaining the chalcogenide glass photonic crystal fiber preform without gaps among the capillaries. The preparation method has the advantages of orderly arranged hollow holes and no gap defect among the capillaries.

Description

technical field [0001] The invention relates to the field of photonic crystal optical fibers, in particular to a method for preparing a chalcogenide glass photonic crystal optical fiber prefabricated rod. Background technique [0002] Photonic crystal fiber (PCF, also known as microstructure fiber or holey fiber), the cladding is composed of periodically arranged hollow holes extending along the fiber axis to the entire fiber, the structure is very adjustable, and has some unique Optical properties, such as unlimited single-mode, controllable dispersion, high birefringence, high nonlinearity, large mode field, etc. Chalcogenide glass is an infrared optical material with excellent performance, which has low phonon energy, high refractive index, wide infrared transmission window, and good chemical and thermal properties. In recent years, research on photonic crystal fibers made of chalcogenide glass as a new type of material has attracted much attention. Massachusetts Instit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/012
CPCC03B37/0122Y02P40/57
Inventor 刘自军陈华王训四黄炎戴世勋许银生沈祥张培全
Owner NINGBO UNIV
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