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Two-dimensional material-based quantum dot film for saturable absorber, preparation method thereof and application of quantum dot film to ultrafast laser

A technology of saturable absorption and two-dimensional materials, which is applied in the field of ultrafast pulsed lasers, can solve the problems of low light absorption rate, achieve simple preparation methods, meet application requirements, and improve stability

Inactive Publication Date: 2016-11-09
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above problems, the invention provides a quantum dot film based on a two-dimensional material for a saturable absorber, the light absorptivity of the quantum dot film based on a two-dimensional material is higher than that of a conventional two-dimensional material An order of magnitude larger, which solves the problem of low light absorption rate when using conventional two-dimensional materials, thereby improving the stability of passive mode-locked fiber lasers

Method used

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  • Two-dimensional material-based quantum dot film for saturable absorber, preparation method thereof and application of quantum dot film to ultrafast laser
  • Two-dimensional material-based quantum dot film for saturable absorber, preparation method thereof and application of quantum dot film to ultrafast laser
  • Two-dimensional material-based quantum dot film for saturable absorber, preparation method thereof and application of quantum dot film to ultrafast laser

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preparation example Construction

[0047] The second aspect of the present invention provides a method for preparing a quantum dot film based on a two-dimensional material for a saturable absorber, comprising the following steps:

[0048] A quantum dot solution based on two-dimensional materials is provided, wherein the quantum dots in the quantum dot solution based on two-dimensional materials are at least one of graphene quantum dots, topological insulator quantum dots, transition metal sulfide quantum dots and black phosphorus quantum dots, The size of quantum dots is below 100nm;

[0049] After ultrasonic dispersion, the quantum dot solution is dropped or coated on the substrate, and dried at 70-100° C. under vacuum conditions to form a two-dimensional material-based quantum dot film on the substrate.

[0050] In the embodiment of the present invention, the quantum dot solution is mixed with the polymer organic compound, and after ultrasonic dispersion, a mixed solution is obtained; the polymer organic comp...

Embodiment 1

[0088] A method for preparing a quantum dot film based on a two-dimensional material, comprising the following steps:

[0089] Provide black phosphorus quantum dot solution, mix 20mL black phosphorus quantum dot solution and 2mg polyvinyl alcohol, and ultrasonically disperse at a frequency of 50Hz to obtain a mixed solution; drop the mixed solution on the copper foil, and dry it at 70°C under vacuum , forming a black phosphorus quantum dot film on copper foil.

[0090] Copper foil with FeCl 3 Dissolved, and then, use the fiber tip to stick the floating FeCl 3 The quantum dot film on the solution, so that the quantum dot film is transferred from the copper foil to the end face of the optical fiber head.

[0091] A saturable absorber, the saturable absorber includes an optical fiber connector, an optical fiber adapter, a black phosphorus quantum dot film and another optical fiber connector, wherein the optical fiber end surface of the optical fiber connector is bonded with a b...

Embodiment 2

[0096] A method for preparing a quantum dot film based on a two-dimensional material, comprising the following steps:

[0097] Provide a graphene quantum dot solution, mix 20mL graphene quantum dot solution and 2mg polymethyl methacrylate, and ultrasonically disperse at a frequency of 50Hz to obtain a mixed solution; drop the mixed solution on the copper foil, and store it at 100°C under vacuum After drying, a black phosphorus quantum dot film is formed on the copper foil.

[0098] Copper foil with FeCl 3 Dissolved, and then, use the fiber tip to stick the floating FeCl 3 The quantum dot film on the solution, so that the quantum dot film is transferred from the copper foil to the end face of the optical fiber head.

[0099] An all-fiber laser includes a pump source, a wavelength division multiplexer, an erbium-doped gain fiber, a polarization controller, a polarization-independent isolator, a fiber coupler and the above-mentioned saturable absorber.

[0100] In this embodim...

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Abstract

The present invention provides a two-dimensional material-based quantum dot film for a saturable absorber. The components of the two-dimensional material-based quantum dot film comprise quantum dots, wherein the quantum dots are at least one kind of quantum dots selected from graphene quantum dots, topological insulator quantum dots, transition metal sulfide quantum dots and black phosphorus quantum dots, the size of the quantum dots being smaller than 100 nm; the optical absorption rate of the quantum dot film is larger than that of a quantum dot film made of a conventional two-dimensional material by one order of magnitude; and the quantum dots have a saturable absorption characteristic as the conventional two-dimensional material. The invention also provides a preparation method of the two-dimensional material-based quantum dot film and the application of the two-dimensional material-based quantum dot film. When the quantum dot film is applied to an ultrafast passive mode-locked laser, quantum dots of the different can be selected according to the operating wavelength of the laser, so that the energy band gap of the quantum dots can be consistent with the operating wavelength of the ultrafast mode-locked laser; and due to a quantum confinement effect and an edge effect, the quantum dot material can strongly absorb laser within energy bands, and therefore, the stability of the laser can be improved.

Description

technical field [0001] The invention relates to the field of ultrafast pulsed lasers, in particular to a two-dimensional material-based quantum dot thin film for a saturable absorber, a preparation method thereof, and an application in ultrafast lasers. Background technique [0002] In lasers, because passive mode-locked lasers can provide ultra-short pulses with high stability, high beam quality, and high energy, they are widely used in scientific research, industry, national defense, environment, energy, communications and other fields that are closely related to people's lives. It has strong application value. [0003] The method to achieve passive mode-locking of lasers mainly includes passive mode-locking of saturable absorbers. At present, commonly used saturable absorbers include two-dimensional materials such as graphene, topological insulator, molybdenum disulfide or black phosphorus, although these two-dimensional materials have broadband , small band gap, high ca...

Claims

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Application Information

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IPC IPC(8): H01S3/098
CPCH01S3/1115
Inventor 张晗王志腾王可
Owner SHENZHEN UNIV
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