Graphene-based saturable absorber devices and methods

A saturable absorption and graphene technology, applied in laser components, instruments, lasers, etc., can solve problems such as poor broadband tunability, inherent problems of precise control of saturable absorbers, high unsaturation loss, etc.

Inactive Publication Date: 2012-05-02
NAT UNIV OF SINGAPORE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the heterogeneous chiral nature of SWCNTs is inherently problematic for the precise control of the properties of saturable absorbers.
SWCNTs that are not in resonance cause insertion loss when operating at a specific wavelength
Therefore, the broadband tunability of SWCNT is poor
Furthermore, although the polymer host may prevent some of these problems to some extent and facilitate device integration, the bundled and entangled SWCNTs, the presence of catalyst particles, and the formation of gas bubbles lead to high unsaturation losses in the cavity.

Method used

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  • Graphene-based saturable absorber devices and methods
  • Graphene-based saturable absorber devices and methods
  • Graphene-based saturable absorber devices and methods

Examples

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Embodiment 1

[0036] figure 1 is a perspective view of an optical fiber 10 having a terminal facet 14 onto which graphene-based graphene in the form of a single-layer graphene film 20 (i.e., one atomic layer of graphene or "graphene monolayer") is assembled. A saturable absorber material 18 as a saturable absorber device 22 . figure 1 The saturable absorber device 22 of is suitable for use in mode-locked and Q-switched fiber lasers as described below. figure 1 It is shown that the optical fiber 10 is clamped in the axial pinhole 4 of the ferrule 6 with the end face 8 . The ferrule 6 acts as a fiber holder.

[0037] The graphene monolayer 20 can be obtained by methods such as mechanical exfoliation, epitaxial growth, chemical vapor deposition and chemical processing (solution processing) methods, as well as laser ablation and filtered cathodic arc methods. After the graphene monolayer 20 has been suitably prepared on the substrate, the monolayer is removed as a graphene film and transferr...

Embodiment 2

[0043] figure 2 and figure 1 Similarly, is a perspective view of an optical fiber 10 having a graphene-based saturable fiber in the form of a multilayer graphene film 30 (i.e., graphene polyatomic layers or "graphene multilayers") assembled on the fiber end facet 14. The absorber material 18 serves as a saturable absorber device 22 . figure 2 The saturable absorber device 22 is fabricated for use in mode-locked and Q-switched fiber lasers as described below.

[0044] image 3 Is a photograph of a fiber pigtail 100 with a ferrule 6 clamping an optical fiber 10 and a multilayer graphene film 30 on the end face 8 covering the pinhole 4 and the fiber end facet 14 . A fiber pigtail 100 is inserted into a fiber laser to generate mode-locked or Q-switched pulses, as described below.

[0045] Figure 4 is a magnified optical image of the end face of fiber pigtail 100 showing graphene-based saturable absorber material 18 in the form of multilayer graphene 30 covering pinhole 4 a...

Embodiment 3

[0051] Figure 5 and figure 1 Similarly, is a perspective view of an optical fiber 10 having a graphene-based saturable absorber material 18 in the form of a graphene film 40 . The graphene film 40 is formed from a single layer graphene sheet 42 assembled on the fiber end facet 14 thereby forming the saturable absorber device 22 . Figure 5 The saturable absorber device 22 of is suitable for use in mode-locked and Q-switched fiber lasers as described below.

[0052] In one example, single-layer graphene sheets 42 have small dimensions, eg, less than 10 μm. In one example, a graphene sheet 42 is assembled onto the end facet of a fiber pigtail as a graphene film 40 covering the pinhole 4, and the pigtail 100 is inserted into a fiber laser to generate mode-locked or Q-switched pulses. In one example, small-scale graphene sheets 42 are obtained by solution processing routes or by post-processing of single-layer graphene on a substrate. Post-processing methods include, but are ...

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Abstract

A graphene-based saturable absorber device (22) suitable for use in a ring-cavity fiber laser (200) or a linear-cavity fiber laser (300) is disclosed. The saturable absorber device includes an optical element (10) and a graphene-based saturable absorber material (18) supported by the optical element and comprising at least one of graphene, a graphene derivative and functionalized graphene. An examplary optical element is an optical fiber having an end facet (14) that supports the saturable absorber material. Various forms of the graphene-based saturable absorber materials and methods of forming same are also disclosed.

Description

[0001] priority claim [0002] This application claims priority to US Provisional Patent Application 61 / 168,661, filed April 13, 2009, entitled "Optical element." technical field [0003] The present invention relates to saturable absorbers for fiber lasers, in particular, graphene-based saturable absorber devices and methods for mode-locking, Q-switching, optical signal processing, etc. in fiber lasers. Background technique [0004] Mode-locked fiber lasers have replaced bulk solid-state lasers in many research / industrial fields where high-quality optical pulses are required. Advantages include: simple structure, outstanding pulse quality and efficient operation. Recently, the development of compact diode-pumped ultrafast fiber lasers as an alternative to bulk solid-state lasers has progressed rapidly. [0005] Currently, short pulse generation has been particularly effective using passive mode-locking techniques. The main technology in passively mode-locked fiber lasers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/05H01S3/067H01S3/098
CPCH01S3/1118H01S3/067H01S3/06708H01S3/06725H01S3/06791H01S3/094046H01S3/10076H01S3/113H01S3/1608H01S2301/085Y10T156/10G02F1/3523H01S3/094003
Inventor 罗健平鲍桥梁唐定远张晗
Owner NAT UNIV OF SINGAPORE
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