Gradual change waveguide based graphene saturable absorber and preparation method thereof

A saturable absorption, graded waveguide technology, applied in the field of saturable absorber and its preparation, can solve the problems of small interaction range between light and graphene, easy to generate thermal damage, etc., achieve easy practical application, increase the fundamental mode field area , the effect of increasing the damage threshold

Inactive Publication Date: 2014-03-19
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Saturable absorbers of graphene currently used in fiber lasers are graphene films inserted between two optical fibers (Q. Bao, H. Zhang, Y. Wang, Z. Ni, Y. Yan, Z. X. Shen, K. P. Loh , D. Y. Tang, Atomic-layer graphene as a saturated absorber for ultrafast pulsed lasers, Adv. Funct. Mater. 19, 1-7, (2009); Z. Sun, T. Hasan, F. Torrisi, D. Popa, G . Privitera, F. Wang, F. Bonaccorso, D. M. Basko, A. C. Ferrari, Graphene mode-locked ultrafast laser. ACS Nano 4, 803-810, (2009).), but the light in the fiber is only in the core (diameter 8μm ) medium transmission, light and graphene have a small range of action, resulting in thermal damage that is easily generated under the action of high-power light

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  • Gradual change waveguide based graphene saturable absorber and preparation method thereof
  • Gradual change waveguide based graphene saturable absorber and preparation method thereof
  • Gradual change waveguide based graphene saturable absorber and preparation method thereof

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with specific examples. The examples provide detailed implementations and specific operating procedures, but the production of the present invention is not limited to the following implementations.

[0028] The graded waveguide is mainly prepared by using multiple electrode discharge melting technology and micro-scale grinding technology to prepare the graded waveguide. figure 1 is the cross-sectional mode field diagram of the fundamental mode propagation in the single-mode fiber, figure 2 Cross-sectional mode field diagram of the fundamental mode propagation in the proposed tapered waveguide. Depend on figure 1 with figure 2 It can be seen from the comparison that the graded waveguide can greatly increase the effective area of ​​light and graphene film.

[0029] The following are the specific implementation steps:

[0030] Step 1. Using the multiple electrode discharge fusion technology of the...

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Abstract

The invention belongs to the technical fields of a micro nano device and an ultrashort pulse laser, and specifically discloses a gradual change waveguide based graphene saturable absorber and a preparation method thereof. Conventionally, the quite small effect area of a base mode and a graphene film in a fiber waveguide causes light concentration type heat damage. In the graphene saturable absorber, a left-end fiber with a gradual change waveguide, a graphene film and a right-end fiber with a gradual change waveguide form a sandwich structure. The graphene saturable absorber prepared by use of the gradual change waveguides enables larger effect area of a light spreading base mold and graphene in a light waveguide, reduces concentration heat damage, and can be used in different wavelengths. The preparation process is simple, the cost is low, the actual application is facilitated, and the fiber system integration is facilitated.

Description

technical field [0001] The invention belongs to the technical field of micro-nano devices and ultrashort pulse laser technology, and in particular relates to a saturable absorber and a preparation method thereof. Background technique [0002] Ultrafast and ultrashort pulse technology plays a very important role in manufacturing, aerospace, biology, military and many other fields. Saturable absorbers have an extremely important impact on the development of ultrafast and ultrashort pulse technology. Although there are semiconductors that can Saturable absorbers, carbon nanotubes, etc. are used as saturable absorbers to generate ultrafast and ultrashort pulses, but there are deficiencies, such as: the preparation process of semiconductor saturable absorbers is complicated and the cost is high, and the surface of carbon nanotubes The scattering is serious, and it is easy to gather into beams, and it is difficult to disperse, which seriously affects its optical performance. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/098
Inventor 何晓颖徐敏
Owner FUDAN UNIV
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