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Broadband saturable absorber, preparation method thereof and laser pulse based on device

A technology of saturable absorption and pulsed lasers, applied in the laser field, can solve problems such as difficult to achieve precise control, lack of practicability and application prospects, and easy to break, so as to improve photothermal stability, reduce photothermal effects, and improve damage The effect of the threshold

Inactive Publication Date: 2015-08-12
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this micro-nano-fiber-gold nanorod type saturable absorber still has certain deficiencies in the actual use process, which is shown in: 1. The micro-nano fiber is tapered to several microns through bare fiber fusion, and in actual use easy to break during the process, making the device less flexible in operation and difficult to integrate
2. The process of photodeposition of gold nanorods on micro-nano optical fibers is cumbersome and difficult to achieve precise control
3. The prepared saturable absorber is not easy to preserve, and its practicability and application prospects are also lacking

Method used

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  • Broadband saturable absorber, preparation method thereof and laser pulse based on device
  • Broadband saturable absorber, preparation method thereof and laser pulse based on device
  • Broadband saturable absorber, preparation method thereof and laser pulse based on device

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Embodiment Construction

[0065] The preparation method of the broadband saturable absorber based on the gold nanorod / silicon dioxide core-shell structure composite nanomaterial will be further described in detail below through specific implementation examples and in conjunction with the accompanying drawings.

[0066] Step 1, 5 mL of 0.2 mol / L cetyltrimethylammonium bromide (CTAB) and 250 μL of 0.01 mol / L chloroauric acid (HAuCl 4 ) into 5 mL of ultrapure deionized water, stirred for 30 seconds to mix evenly; added 0.6 mL of 0.01 mol / L sodium borohydride solution, and stirred for 2 minutes until the solution turned dark brown. Mark this solution as gold seed solution;

[0067] Step 2, the cetyltrimethylammonium bromide (CTAB) of 30mL 0.2mol / L, the chloroauric acid (HAuCl) of 1.5mL 0.01mol / L 4 ), 40μL 0.5mol / L nitric acid (HNO 3 ) into 25 mL of ultrapure deionized water; then 360 μL of 0.08 mol / L ascorbic acid (AA) solution was added and stirred for 2 minutes until the solution became colorless. Lab...

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Abstract

The invention provides a broadband saturable absorber comprising a gold nanorod and a surface decoration material which coats the surface of the gold nanorod. A core-shell structure composite nano material is formed by the gold nanorod and the surface decoration material. According to the broadband saturable absorber, the damage threshold of a saturable absorber is greatly improved, and the stable operation of an ultrafast pulse can be realized.

Description

technical field [0001] The invention relates to the field of laser technology. Specifically, it relates to a broadband saturable absorber based on a gold nanorod / silica core-shell composite nanomaterial, a preparation method and a pulsed laser based on the device. Background technique [0002] Passively mode-locked fiber lasers provide a good platform for the generation of ultrafast laser pulses, and they have great application value in both industrial fields and basic research. In order to achieve passive mode locking, saturable absorbers are a key device in fiber lasers. Therefore, in order to develop high-performance saturable absorbers, various research groups have made great efforts. So far, both ultrashort pulses have been obtained in fiber lasers using saturable-like absorbers and real saturable absorbers. Saturable absorbers are generally realized by nonlinear effects, such as nonlinear polarization rotation (NPR) and nonlinear magnifying loop mirror (NALM). Altho...

Claims

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Application Information

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IPC IPC(8): H01S3/11H01S3/067
Inventor 罗智超汪徐徳罗爱平徐文成
Owner SOUTH CHINA NORMAL UNIVERSITY
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