Fiber optic image inverter with ultra-short twister, fabrication method therefor, application thereof, and related composition

A method for fabricating a fiber optic image inverter with an ultra-short twister, wherein the method comprises the following steps:

• (1) surrounding pipe fiber drawing:
• drawing a round glass rod with a low refractive index and a high strain point temperature into the surrounding pipe fiber with Φ1.6-2.0 mm;
• (2) filling glass fiber drawing:
• drawing a glass rod with a high refractive index and a high transmittance into the filling glass fiber;
• (3) casing pipe absorption fiber drawing:
• preparing a light absorption glass with a light absorption property into a light absorption glass rod, matching the light absorption glass rod and a cladding glass pipe, and then drawing into the casing pipe absorption fiber;
• (4) mono fiber drawing:
• uniformly surrounding an outer side of the cladding glass pipe with the surrounding pipe fiber, then matching a core glass rod with a high refractive index and the cladding glass pipe surrounded with the surrounding pipe fiber, and then performing drawing of the mono fiber to obtain the drawn mono fiber, wherein a diameter of the mono fiber is the same as a diameter of the casing pipe absorption fiber;
• (5) multi fiber drawing:
• arranging the drawn mono fibers into a multi assembly rod with an orthohexagonal cross section, wherein the number of mono fibers on each side in the multi assembly rod is N, replacing one mono fiber arranged at a center of the hexagonal multi assembly rod with the casing pipe absorption fiber, and filling and inserting the filling glass fibers into a hole of the multi assembly rod;
• followed by drawing the multi assembly rod into the multi fiber;
• (6) multi-multi fiber drawing:
• arranging the drawn multi fibers into a multi-multi assembly rod with an orthohexagonal cross section, then drawing the multi-multi assembly rod into the multi-multi fiber, and then cutting the multi-multi fiber with a fixed length to be arranged into a fiber assembly bundle;
• (7) heat press fusion:
• putting the arranged fiber assembly bundle in a heat press fusion mold, then putting the heat press fusion mold in a heat press fusion furnace, performing heat press fusion according to a designed compression ratio of the fiber assembly bundle before and after heat press fusion, and obtaining a fused boule after heat press fusion;
• and
• (8) twisting operation:
• subjecting the fused boule to cutting, rounding and grinding machining treatments to obtain a fiber optic image inverter block, and subjecting the fiber optic image inverter block to a 180° twisting operation in an ultra-short high-temperature twisting furnace to obtain a fiber optic image inverter with an ultra-short twister;
• wherein a heating furnace body in the ultra-short high-temperature twisting furnace has a width ranging from 3 mm to 4 mm, a distance from the heating furnace body to a surface of the fiber optic image inverter block ranges from 1.0 mm to 2.5 mm, and twisting operation time for twisting the fiber optic image inverter block by 180° ranges from 2 minutes to 9 minutes;
• wherein a composition for fabricating a surrounding pipe fiber is composed of the following components by mole percentage content:
• SiO2
• 78.1-80.0%
• Al2O3
• 3.1-7.0%
• B2O3
• 2.0-8.0%
• Li2O
• 0.0001-1.0%
• Na2O
• 0-2.9%
• K2O
• 5.1-10.0%
• CaO
• 1.1-3.0%
• SrO
• 0.0001-1.0%
• ZnO
• 1.1-2.0%
• TiO2
• 0.0001-1.0%
• CeO2
• 0.05-0.2%
• MgF2
• 0.0001-2.0%
• CaF2
• 0.05-2.0%.