Device for preparing intermediate infrared fiber bragg grating

A technology of Bragg optical fiber and preparation device, which is applied in the direction of cladding optical fiber, optical waveguide and light guide, etc., can solve the problems of limiting the application range of mid-infrared optical fiber lasers and the inability to realize full-fiberization, and achieves simple structure, good temperature stability, and easy The effect of the operation

Inactive Publication Date: 2014-03-05
HFB PHOTONICS CO LTD
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Problems solved by technology

However, limited by mid-infrared fiber gratings, most of the current mid-infrared fiber lasers u...

Method used

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  • Device for preparing intermediate infrared fiber bragg grating

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Embodiment Construction

[0017] The present invention is further described in conjunction with accompanying drawing:

[0018] Such as figure 1 As shown, a mid-infrared fiber Bragg grating (FBG) preparation device includes femtosecond laser 1, collimator lens 2, pinhole diaphragm 3, 1 / 2 wave plate 4, Glan prism 5, mirror 6, planar Convex cylindrical lens 7, Bragg phase mask 8, optical fiber 9, precision displacement platform 10, broadband light source 11, spectrometer 12, characterized in that femtosecond laser 1 emits high-energy femtosecond laser, which is collimated by collimating lens 2 , and the laser spot size is adjusted by the pinhole diaphragm 3, the laser pulse energy is adjusted through the 1 / 2 wave plate 4 and the Gran Prism 5, and then the laser pulse energy is incident on the plano-convex cylindrical lens 7 through the reflector 6, and then passes through the Bragg phase mask 8 produced First-order diffracted light, +1-order and -1-order diffracted light generate interference fringes i...

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Abstract

The invention discloses a device for preparing an intermediate infrared fiber bragg grating. The device is characterized in that a femtosecond laser device emits a high-energy femtosecond laser, and is aligned by a collimating lens; the size of a laser spot is adjusted by a small aperture; laser pulse energy is adjusted by a 1/2 wave plate and a glan prism; finally, the laser enters a convex-plane cylindrical lens through a reflector, and then a diffraction light is generated through a bragg phase mask; +1 level and -1 level diffraction lights generate interference fringes in an overlapping region; an optical fiber is erected on a precision displacement platform; one end of the optical fiber is connected with a broadband light source, and the other end of the optical fiber is connected with a spectral measurement instrument. By adopting the device, a method for preparing the intermediate infrared fiber bragg grating is achieved. The optical system is simple, the method has no demand on the light sensitivity of the optical fiber except for the advantages of traditional ultraviolet (UV) excimer laser writing grating, and the prepared fiber grating has excellent temperature stability.

Description

technical field [0001] The invention relates to a fiber grating preparation technology, in particular to a mid-infrared Bragg fiber grating preparation device based on a phase mask method and a femtosecond laser. Background technique [0002] Mid-infrared fiber lasers can be widely used in medicine, sensing, national defense and other fields. However, limited by mid-infrared fiber gratings, most of the current mid-infrared fiber lasers use many free-space optics (bulk optics) such as optical lenses, mirrors, etc. Applications of lasers. Therefore, it is of great value to prepare high-quality mid-infrared fiber gratings. [0003] With ultra-high peak power and ultra-fast action time, the high-energy femtosecond laser acts on the material, causing densification through multi-photon ionization, resulting in local melting and rapid quenching of the insulating material after the photoexplosion, changing the refractive index of the material. Therefore, the high-energy femtoseco...

Claims

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Application Information

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IPC IPC(8): G02B6/02
Inventor 史伟房强樊景丽
Owner HFB PHOTONICS CO LTD
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