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Saturable absorber based on plasmon axial vibration mode

A saturable absorption, axial vibration technology, applied in the structure/shape of the active medium, lasers, electrical components, etc., can solve the problems of single surface plasmon resonance absorption peak, difficult to control, etc.

Active Publication Date: 2013-11-20
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It has been reported that spherical gold nanoparticles can be used to realize Q-switched pulsed laser output, but due to the highly symmetric structure of spherical gold nanoparticles, the plasmon vibration is also isotropic, which manifests as a single surface plasmon excitation. Meta-resonance absorption peak, and the position of its plasmon resonance peak is limited to the wavelength range of 510-530nm
The absorption peak can be broadened by adjusting the aggregation of spherical gold nanoparticles, but this aggregation of spherical gold nanoparticles is difficult to control

Method used

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  • Saturable absorber based on plasmon axial vibration mode
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  • Saturable absorber based on plasmon axial vibration mode

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Example 1: Preparation of a saturable absorber material mixed with gold nanorods and sodium carboxymethylcellulose (NaCMC) and used for 1560nm mode-locked laser output

[0055] 1. Sample preparation process

[0056] The synthesis of gold nanorods adopts the "seed crystal method". First, 10mL of cetyltrimethylammonium bromide (0.2M), 10mL of chloroauric acid solution (0.5mM) and 1mL of fresh sodium borohydride (0.01mM) were mixed uniformly in a beaker and stirred, After stirring for two hours, a seed solution was obtained. Then, 20ml of cetyltrimethylammonium bromide (0.15M), 12.5ml of 5-bromosalicylic acid (0.2M), 2ml of silver nitrate aqueous solution (4mM) and 35.2ml of chloroauric acid solution (0.1 mM) were mixed uniformly in the flask, and then 1 mL of ascorbic acid (0.1 mM) was added to obtain a growth solution. Finally, 0.5 mL of seed solution was added to the above growth solution, and vigorously stirred for 30 minutes. After the reaction solution was left s...

Embodiment 2

[0059] Example 2: Preparation of a saturable absorber material mixed with gold nanorods and polyvinyl alcohol (PVA) and used for 1560nm mode-locked laser output

[0060] 1. Sample preparation process

[0061]The synthesis of gold nanorods adopts the "seed crystal method". First, 10mL of cetyltrimethylammonium bromide (0.2M), 10mL of chloroauric acid solution (0.5mM) and 1mL of fresh sodium borohydride (0.01mM) were mixed uniformly in a beaker and stirred, After stirring for two hours, a seed solution was obtained. Then, 20ml of cetyltrimethylammonium bromide (0.15M), 12.5ml of 5-bromosalicylic acid (0.2M), 2ml of silver nitrate aqueous solution (4mM) and 35.2ml of chloroauric acid solution (0.1 mM) in the flask and mix well, then add 1mL ascorbic acid (0.1mM), and the growth solution is prepared successfully. Finally, 0.5 mL of the seed solution was added to the growth solution, and vigorously stirred for 30 minutes. After the reaction solution was left standing for 24 hou...

Embodiment 3

[0064] Example 3: Preparation of a saturable absorber material mixed with gold nanorods and polyvinylpyrrolidone (PVP) and used for 1560nm mode-locked laser output

[0065] 1. Sample preparation process

[0066] The synthesis of gold nanorods adopts the "seed crystal method". First, mix 10 mL of cetyltrimethylammonium bromide (0.2M), 10 mL of chloroauric acid solution (0.5 mM) and 1 mL of fresh sodium borohydride (0.01 mM) in a beaker and stir, After stirring for two hours, a seed solution was obtained. Then, 20ml of cetyltrimethylammonium bromide (0.15M), 12.5ml of 5-bromosalicylic acid (0.2M), 2ml of silver nitrate aqueous solution (4mM) and 35.2ml of chloroauric acid solution (0.1 mM) in the flask were mixed evenly, and then 1 mL of ascorbic acid (0.1 mM) was added, so that the growth solution was successfully prepared. Finally, 0.5 mL of the seed solution was added to the growth solution, and vigorously stirred for 30 minutes. After the reaction solution was left stand...

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Abstract

The invention relates to a saturable absorber based on a plasmon axial vibration mode and belongs to the technical field of pulse laser. The invention particularly relates to a novel saturable absorber which consists of gold nanorods and film forming agent and can be used for mode-locked fiber lasers. The saturable absorber based on the gold nanorods can be prepared by adopting the method which comprises the steps of mixing the gold nanorod water dispersion and film forming agent water solution according to a molar ratio of (8-133):1, and performing ultrasonic dispersion for 2-5hours; and finally spin-coating the mixed solution on surfaces of flat silicon wafers and naturally drying the silicon wafers in a vacuum closed container till films are formed. The output of pulse laser at a near-infrared band is realized by using the unique longitudinal surface plasma resonance absorption characteristic of the gold nanorods. The saturable absorber based on the plasmon axial vibration mode enables the types of saturable absorbers to be expanded and can be widely used for mode locking of lasers at a visible-near infrared band.

Description

technical field [0001] The invention belongs to the technical field of ultrashort pulse lasers, and in particular relates to a saturable absorber which is composed of film-forming agent materials and gold nanorods and can be used for mode-locking of fiber lasers based on plasmonic axial vibration modes. Background technique [0002] Pulse laser technology is a new branch of discipline developed after the invention of laser. It not only has ultra-high peak power, but also has ultra-short pulse width, so it has broad application prospects in industrial processing, communication, medicine, optical information processing, basic research, military and other fields. Pulsed lasers have experienced the development from dye lasers to solid-state lasers, opening up a new era of scientific and industrial applications. However, its high price, bulky size, and poor stability to the environment hinder the application of pulsed lasers. Therefore, exploring new mechanisms, new materials, ...

Claims

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Application Information

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IPC IPC(8): H01S3/098H01S3/067
Inventor 秦冠仕秦伟平康喆赵丹吴长锋贾志旭刘来
Owner JILIN UNIV
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