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A δ-mno based 2 Saturable absorbers of nanosheets, preparation methods and applications in passively Q-switched fiber lasers

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

Active Publication Date: 2022-03-08
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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  • A δ-mno based <sub>2</sub> Saturable absorbers of nanosheets, preparation methods and applications in passively Q-switched fiber lasers
  • A δ-mno based <sub>2</sub> Saturable absorbers of nanosheets, preparation methods and applications in passively Q-switched fiber lasers
  • A δ-mno based <sub>2</sub> Saturable absorbers of nanosheets, preparation methods and applications in passively Q-switched fiber lasers

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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 was mixed according to the volume ratio of 1:1 to 1:2, and the ultrasonic dispersion was uniform, and the resulting mixed solution was 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 1-2 nm, and the transverse dimension is 200-500 nm; the film-forming agent is one of sodium carboxymethyl cellulose 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 δ-MnO based 2 The saturable absorber of the nanosheet, the preparation method and the application of the passive Q-switched fiber laser belong to the field of fiber laser technology. The saturable absorber provided by the present invention is an ultra-thin δ-MnO with 1 to 2 monolayers 2 Nanosheets. The δ‑MnO 2 Nanosheets have saturable absorption properties and play a role in adjusting the Q value in Q-switched lasers. In the early stage of pumping, the erbium-doped fiber in the ring cavity produces weak fluorescence, the transmittance in the saturable absorber is very low, and the cavity is in a state of low Q value, and laser oscillation cannot be formed; as the pumping light continues to act, The fluorescence intensity in the cavity increases gradually. When the light intensity exceeds the photobleaching threshold of the saturable absorber, the transmittance of the saturable absorber becomes larger, the saturable absorber is transparent to light, the loss in the cavity decreases, and the Q The value increases rapidly, and the laser oscillation is quickly established in the resonator to generate Q-switched pulse laser.

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 Patents(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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