Crystal growth furnace of fiber polarizer

Abstract

The invention belongs to the technology of fiber polarizer manufacture, and relates to a crystal growth furnace of fiber polarizer, which achieves specific temperature gradient distribution. The crystal growth furnace comprises an upper heat furnace and a lower heat furnace which are arranged up and down correspondingly, wherein a crystal growth cavity is formed in the upper heat cavity, and a substrate groove is formed in the lower heat furnace corresponding to the crystal growth cavity; the cross section of the crystal growth cavity is basically the same as the crystal shape, but the area ofthe cross section of the crystal growth cavity is far larger than that of the crystal, and a symmetric interval is kept between the crystal growth cavity and the crystal. According to the crystal growth furnace, by designing and controlling a temperature field and sufficiently utilizing the impact regulation of the hearth surface situation on the temperature field, the growth defect rate of sodium nitrate monocrystal can be reduced, high quality and high reliability of a fiber polarizer can be realized, and the anisotropic temperature expansion coefficients and easy cracking in alternating temperature of sodium nitrate monocrystal can be overcome.

Description

Technical field [0001] The invention belongs to the manufacturing technology of an optical fiber polarizer, and relates to an optical fiber polarizer crystal growth furnace capable of realizing a specific temperature gradient distribution. Background technique [0002] In the all-fiber melting point-free fiber optic gyroscope, the fiber polarizer is one of its core components. Its function is to realize the polarization state selection and polarization of the light transmitted by the optical path. Its performance limits the core indicators such as the zero-bias temperature and signal-to-noise ratio of the fiber optic gyroscope. . In the online manufacturing technology of the crystal-wrapped fiber polarizer of the all-fiber melting point-free fiber optic gyroscope, the temperature gradient realization device for obtaining high-quality, low-defect sodium nitrate single crystal is the key point. [0003] Because of the spherical design of the existing fiber polarizer crystal growth f...

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Problems solved by technology

[0003] Due to the spherical design of the existing fiber optic polarizer crystal growth furnace, it is difficult to control the temperature field distribution of the furnace cavity, and there are many crystal growth defects, which are prone to crystal growth flat top, which affects product quality

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