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AssigneeShanghai University
InventorsJianxiang WEN, Zheng LIU, Tingyun WANG, Yanhua DONG, Fufei PANG, Ziwen ZHAO, Zhenyi CHEN
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The invention discloses a preparation method and device of active microcrystalline fiber, place the prefabricated rod in the drawing furnace for wire drawing, the drawn fiber is induced by magnetic field in uncoated state and combined with laser treatment technology, the laser beam is focused on the fiber and recrystallized after laser treatment to obtain active microcrystalline fiber. Appropriate laser processing power directly affects the silicate glass fiber in the crystal structure, type, degree of crystallinity, grain size, content, and how much residual phase of glass. Induced by external magnetic field, the thermodynamics and dynamics of crystallization process are changed, make the crystal size distribution is better and uniform, reduce the phenomenon of condensation and makes the grain size is smaller.
-14. (canceled)
A method of preparation active optical fiber, wherein the drawn fiber is introduced into a magnetic field and the fiber is irradiated by a laser, in place the prefabricated rod in a drawing furnace for wire drawing, the drawn fiber is induced by magnetic field in uncoated state and combined with laser treatment technology, the laser beam is focused on the fiber and recrystallized after laser treatment to obtain active optical fiber.
The method of preparation active optical fiber according to claim 1, wherein the magnetic field is a stable magnetic field, alternating magnetic field or pulsed magnetic field.
The method of preparation active optical fiber according to claim 1, wherein the strength of the magnetic field is 0-5T.
The method of preparation active optical fiber according to claim 1, wherein the laser has a power of 0-5W.
The method of preparation active optical fiber according to claim 1, wherein the laser beam spot is ring or circular, and the diameter of the spot is 0.1˜5 mm.
An active optical fiber prepared by the method of claim 1, Including a fiber core and a cladding layer, wherein the fiber core is yttrium aluminum garnet, bismuth germanate, lead tungstate or sodium iodide. The crystal size is 2˜100 nm, and the cladding is quartz material.
The active optical fiber according to claim 6, wherein the cores are singly or jointly doped with:
The active optical fiber according to claim 6, wherein the diameter of the fiber core is 5˜100 um, and the diameter of the cladding is 120˜800 um.
The active optical fiber according to claim 6, wherein the active microcrystalline fiber passes the laser performance test and produces laser output with conversion efficiency of 30˜80%.
A device of preparation active optical fiber, including wire drawing furnace (2), wherein a magnetic field generating device (3) and a laser generator (4) are arranged in the outlet direction of wire drawing furnace (2). in place the prefabricated rod in the drawing furnace for wire drawing, the drawn fiber is induced by magnetic field in uncoated state and combined with laser treatment technology, Complete the laser processing of the doped fiber under the action of a magnetic field, the laser beam is focused on the fiber and recrystallized after laser treatment to obtain active optical fiber.
The device of preparation active optical fiber according to claim 10, wherein the magnetic field generated by the magnetic field generator (3) is stable magnetic field, alternating magnetic field or pulsed magnetic field.
The device of preparation active optical fiber according to claim 10, wherein the laser generator (4) is fiber laser, gas laser or semiconductor laser.
The device of preparation active optical fiber according to claim 10, wherein the drawing furnace is a graphite drawing furnace or a laser drawing furnace.
Dependencies are inferred from the claim text.