Saturable absorber based on delta-MnO2 nanosheet, preparation method and application of passive Q-switched fiber laser

A technology of saturable absorption and fiber lasers, applied in the field of passive Q-switched fiber lasers, can solve the problems of complex preparation process of two-dimensional topological insulators, unsuitable saturable absorbers, poor chemical stability of black phosphorus, etc. Q-switched pulsed laser, high peak power, low cost effect

Active Publication Date: 2021-01-01
JILIN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, these 2D nanomaterials still have some disadvantages when used as saturable absorbers
For example, the modulation depth of graphene is low; the preparation process of two-dimensional topological insulators is complicated; most layered transition metal divalent compounds have large band gaps and require complex control of defects, so they are not suitable for use as saturable absorbers; However, black phosphorus has poor chemical stability and is easily oxidized in the air.

Method used

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  • Saturable absorber based on delta-MnO2 nanosheet, preparation method and application of passive Q-switched fiber laser
  • Saturable absorber based on delta-MnO2 nanosheet, preparation method and application of passive Q-switched fiber laser
  • Saturable absorber based on delta-MnO2 nanosheet, preparation method and application of passive Q-switched fiber laser

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] δ-MnO 2 The preparation of nanosheets comprises the following steps:

[0040] (1) Add 32mL of sodium dodecylsulfonate solution (0.1M) and 1.6mL of sulfuric acid solution (0.1M) into 283.2mL of deionized water, heat the mixture to 95°C and continue stirring for 15 minutes;

[0041] (2) After fully dissolving, add 3.2mL of potassium permanganate solution (0.05M) and maintain 95°C for 60 minutes. During this reaction process, the initial purple-red potassium permanganate solution eventually turned into a brown suspension;

[0042] (3) Cool to room temperature after the reaction, centrifuge to separate and precipitate the light brown suspension, wash repeatedly with deionized water and ethanol three times, and finally disperse the product in ethanol.

Embodiment 2

[0044] A δ-MnO based 2 The preparation method of the saturable absorber of nano sheet, comprises the following steps:

[0045] (1) Prepare a sodium carboxymethylcellulose film-forming agent with a mass fraction of 1% to 20%. Weigh a certain mass of sodium carboxymethyl cellulose and add it to deionized water, and continue to stir for 6-8 hours until it is completely dissolved to obtain a film-forming agent of sodium carboxymethyl cellulose;

[0046] (2) The sodium carboxymethylcellulose film-forming agent prepared above and δ-MnO 2 The solution is mixed according to the volume ratio of 1:1 to 1:2, and the ultrasonic dispersion is uniform, and the resulting mixed solution is left standing for 48 hours without precipitation;

[0047] (3) Evenly spin-coat the mixed solution prepared above on 1cm 2 δ-MnO was obtained by natural drying at room temperature for 48 hours on a transparent quartz glass slide substrate 2 Nanosheets saturable absorbers.

Embodiment 3

[0049] A kind of δ-MnO based on two-dimensional structure prepared by the present invention 2 Saturable absorbers of nanosheets made of δ-MnO 2 Composition of nanosheets and film formers, δ-MnO 2 The average thickness of the nanosheets is 1-2nm, and the lateral dimension is 200-500nm; the film-forming agent is one of sodium carboxymethylcellulose or polyvinylpyrrolidone. The δ-MnO 2 Due to the localized surface plasmon resonance effect of nanosheets, they exhibit certain linear absorption characteristics in the near-infrared spectral region (800-2000nm). By testing its nonlinear absorption, it is proved that the δ-MnO 2 Nanosheets have saturable absorption characteristics in the 1.5μm band, and can be used as the core device for realizing pulsed lasers.

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Abstract

The invention discloses a saturable absorber based on delta-MnO2 nanosheets, a preparation method and application of a passive Q-switched fiber laser, and belongs to the technical field of fiber laser. The saturable absorber provided by the invention is an ultrathin delta-MnO2 nanosheet with one to two single layers. The delta MnO2 nanosheet has a saturable absorption characteristic, and plays a role in adjusting a Q value in a Q-switched laser. In the early stage of pumping, the erbium-doped optical fiber in the annular cavity generates weak fluorescence, the transmittance in the saturable absorber is very low, the interior of the cavity is in a low Q value state, and laser oscillation cannot be formed; along with the continuous action of the pump light, the fluorescence light intensity in the cavity is gradually enhanced, when the light intensity exceeds the photobleaching threshold value of the saturable absorber, the transmittance of the saturable absorber is increased, the saturable absorber presents the transparent characteristic to the light, the loss in the cavity is reduced, the Q value is rapidly increased, laser oscillation is rapidly established in the resonant cavity,and Q-switched pulse laser is generated.

Description

technical field [0001] The invention belongs to the field of fiber laser technology, in particular to a δ-MnO-based 2 Saturable absorbers of nanosheets, preparation methods and their applications in passively Q-switched fiber lasers. Background technique [0002] Q-switched fiber lasers are widely used in laser radar, environmental detection, micro-processing and other fields due to their adjustable pulse width and repetition rate and high pulse energy. According to the way of Q-switching, it can be divided into active Q-switching and passive Q-switching. Compared with active Q-switched fiber lasers, passive Q-switched fiber lasers have the characteristics of compact structure, high integration, and low manufacturing cost. Nanomaterials with two-dimensional structures have the advantages of broadband saturable absorption characteristics, ultrafast carrier dynamics, and short recovery time, and have been widely used as saturable absorbers to construct pulsed lasers. These ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/113H01S3/136H01S3/094H01S3/067
CPCH01S3/113H01S3/136H01S3/094H01S3/06791
Inventor 秦伟平周敏何春凤李楠贾恒赵丹秦冠仕
Owner JILIN UNIV
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