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Graphene oxide Q-switching Raman fiber laser

A Raman fiber and graphene technology, applied in the field of laser technology and nonlinear optics, can solve problems such as reduced electrical conductivity, and achieve the effects of high stability, simple preparation process and low cost

Inactive Publication Date: 2013-06-12
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, although the introduction of oxygen-containing functional groups destroys the Dirac cone structure of graphene and significantly reduces its electrical conductivity, a large number of studies have shown that graphene oxide still has an extremely fast recovery time comparable to graphene. Strong saturable absorption properties

Method used

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  • Graphene oxide Q-switching Raman fiber laser
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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] figure 1 It is a structural schematic diagram of Embodiment 1 of the graphene oxide Q-switched Raman fiber laser of the present invention. The pump source (1) is a fiber laser with a central wavelength of 1540nm; the wavelength division multiplexing fiber coupler (2) has a working wavelength of 1540 / 1650nm, which is used to couple the 1540nm pump light and the 1650nm Raman signal light; the Raman fiber (3) Highly nonlinear optical fiber produced by YOFC, with a Raman frequency shift of 13.2THz; circulator (4) is used to ensure the unidirectional transmission of Raman signal light in the cavity (light can only pass through the circulator sequentially in one direction three ports); the graphene oxide saturable absorber (5) is a graphene oxide film deposited on a gold-plated mirror, which is a passive Q-switching device; the Raman signal light passes through a 10 / 90 output coupler (6 ) output; the polarization controller (7) is used to optimize the polarization state of t...

Embodiment 2

[0035] figure 2 It is a structural schematic diagram of Embodiment 2 of the graphene oxide Q-switched Raman fiber laser of the present invention. The pump source (1) is a fiber laser with a central wavelength of 1060nm; the wavelength division multiplexing fiber coupler (2) has an operating wavelength of 1060 / 1120nm, which is used to couple the 1060nm pump light and the 1120nm Raman signal light; the Raman fiber (3) Highly nonlinear optical fiber produced by YOFC, with a Raman frequency shift of 13.2THz; graphene oxide saturable absorber (5) is graphene oxide deposited on the tapered region of the optical fiber, which is a passive Q-switching device ; The Raman signal light is output through the 5 / 95 output coupler (6); the isolator (8) is used to ensure the unidirectional transmission of the intracavity laser.

Embodiment 3

[0037] image 3 It is a structural schematic diagram of Embodiment 3 of the graphene oxide Q-switched Raman fiber laser of the present invention. The pump source (1) is a fiber laser with a central wavelength of 1550nm; the wavelength division multiplexing fiber coupler (2) has a working wavelength of 1550 / 1660nm, which is used to couple 1550nm pump light and 1660nm Raman signal light; fiber Bragg grating (9) has a reflectivity of 90%, a central wavelength of 1660nm, and a reflection bandwidth of 1nm; Raman fiber (3) is a highly nonlinear fiber produced by YOFC, with a Raman frequency shift of 13.2THz; graphene oxide can be saturable The absorber (5) is graphene oxide deposited on a broadband total reflection mirror, which is a passive Q-switching device; a linear resonant cavity is formed between the fiber Bragg grating (9) and the graphene oxide saturable absorber (5); The Mann signal light passes through the signal end of the wavelength division multiplexing fiber coupler ...

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Abstract

The invention discloses a graphene oxide Q-switching Raman fiber laser, which belongs to the field of laser technique and nonlinear optics. The graphene oxide Q-switching Raman fiber laser mainly comprises a pumping source (1), a wavelength division multiplexing fiber coupler (2), a Roman fiber (3), a circulator (4), a graphene oxide saturable absorber (5), an output coupler (6), a polarization controller (7) and the like, wherein an annular cavity structure, a linear cavity structure or a hybrid cavity structure is adopted. The graphene oxide saturable absorber is taken as a passive Q-switching device which has the advantages of low price, easiness in manufacturing, and the like. The entire device has a full fiber structure, so that the saturable absorption property of a graphene oxide material and the Raman effect of the fiber are combined, flexible-wavelength and high-stability pulse laser output can be realized, and a novel efficient and compact light source is realized.

Description

technical field [0001] The invention relates to a graphene oxide Q-switched Raman fiber laser, which belongs to the field of laser technology and nonlinear optics. Background technique [0002] Raman fiber lasers use nonlinear effects (stimulated Raman scattering) in fibers to generate laser output. The output wavelength of this type of laser is very flexible. Through the selection of pump light wavelength and Raman gain medium, combined with cascading technology, special wavelength output can be achieved, which greatly meets the wavelength requirements of detection, sensing, biology, medicine and other fields. Require. [0003] At the same time, the Raman fiber laser can generate high-energy laser pulses on the order of nanoseconds to microseconds by using Q-switching technology. Compared with active Q-switching methods such as acousto-optic Q-switching and electro-optic Q-switching, passive Q-switching greatly reduces the manufacturing cost and structural complexity of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/11H01S3/30H01S3/08
Inventor 王璞徐佳刘江
Owner BEIJING UNIV OF TECH