Femtosecond laser manufacturing device and method of SFBG

A technology of Bragg grating and femtosecond laser, which is applied in cladding optical fiber, optical waveguide and light guide, laser welding equipment, etc., can solve the problem that the sampling period and duty cycle cannot be continuously adjusted

Inactive Publication Date: 2014-10-01
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a femtosecond laser manufacturing device and method for sampling fiber Bragg grating SFBG, using an optical chopper with a continuously adjustable duty ratio to modulate the intensity of the femtosecond laser, Then focus the modulated femtosecond laser and use point-by-point writing to fabricate SFBG in the optical fiber at one time, so as to solve the problem that the sampling period and duty cycle cannot be continuously adjusted in the current SFBG fabrication method

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Embodiment Construction

[0035] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0036] Embodiment of the present invention: the femtosecond laser output from the titanium-doped sapphire femtosecond laser system is combined with a 1 / 2 wave plate and a polarizer to adjust its energy, and then split into beams by a half-transparent and half-mirror. The reflected laser light is received by an optical power meter for monitoring the energy of the femtosecond laser light. The laser beam passing through the half-mirror is modulated by an optical chopper, and the modulated femtosecond laser is focused by a high-magnification microscope objective lens, so that the focus of the focused beam is located on the core of the fiber, and the fiber is held by two fiber holders It is fixed on a high-precision three-dimensional micro-displacement platform, and the optical fiber is moved at a constant speed along the longitudinal direction (perpendicular to the l...

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Abstract

The invention relates to a femtosecond laser manufacturing device and method of an SFBG. Two optical chopper blades with different diameters and same parameters are overlapped, the relative positions of the two blades can be continuously adjusted, the strength of a femtosecond laser is modulated, the modulated femtosecond laser is focused and then irradiates a fiber core of an optical fiber, the optical fiber is fixed to a high-precision micro displacement platform and moves at the constant speed in the direction perpendicular to a laser beam, and the SFBG with the sampling period and duty ratio continuously adjusted is manufactured by changing the moving speed of the micro displacement platform and the modulation frequency and the duty ratio of an optical chopper. The method and device have the advantages of being convenient to operate, high in manufacturing efficiency and the like, are suitable for manufacturing the SFBG of the complex structure and can be widely applied to a multi-wavelength optical fiber filter and an optical fiber laser system.

Description

technical field [0001] The invention belongs to the field of manufacturing non-uniform fiber gratings, and relates to a femtosecond laser manufacturing device and method for sampling fiber Bragg gratings SFBG. Background technique [0002] With the rapid development of optical fiber communication technology, multi-wavelength optical fiber filtering technology plays an increasingly important role in dense wavelength division multiplexing systems and tunable fiber lasers. Sampled fiber Bragg grating (SFBG) has gradually been widely used due to its low insertion loss, multi-wavelength output and other characteristics. SFBG is formed by cascading multiple segments of uniform fiber gratings with the same parameters at equal intervals. The optical add-drop multiplexer in the multiplexing system and the reflector in the tunable fiber laser, so the production of high-quality SFBG has a positive role in promoting the development of fiber optic communication and fiber laser. [0003...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02B23K26/08
Inventor 姜亚军赵建林杨德兴徐健李东
Owner NORTHWESTERN POLYTECHNICAL UNIV
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