Abstract
Mono‐ and few‐layer transition metal dichalcogenides (TMDCs) have been widely used as saturable absorbers for ultrashort laser pulse generation, but their preparation is complicated and requires much expertise. The possible use of bulk‐structured TMDCs as saturable absorbers is therefore a very intriguing and technically important issue in laser technology. Here, for the first time, it is demonstrated that defective, bulk‐structured WTe2 microflakes can serve as a base saturable absorption material for fast mode‐lockers that can produce femtosecond pulses from fiber laser cavities. They have a modulation depth of 2.85%, from which stable laser pulses with a duration of 770 fs are readily obtained at a repetition rate of 13.98 MHz and a wavelength of 1556.2 nm, which is comparable to the performance achieved using mono‐ and few‐layer TMDCs. Density functional theory calculations show that the oxidative and defective surfaces of WTe2 microflakes do not degrade their saturable absorption performance in the near‐infrared range, allowing for a broad range of operative bandwidth. This study suggests that saturable absorption is an intrinsic property of TMDCs without relying on their structural dimensionality, providing a new direction for the development of TMDC‐based saturable absorbers.
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Dates
Type | When |
---|---|
Created | 8 years, 11 months ago (Sept. 12, 2016, 3:24 a.m.) |
Deposited | 1 year, 10 months ago (Oct. 6, 2023, 11:30 p.m.) |
Indexed | 1 week, 1 day ago (Aug. 29, 2025, 6:35 a.m.) |
Issued | 8 years, 11 months ago (Sept. 12, 2016) |
Published | 8 years, 11 months ago (Sept. 12, 2016) |
Published Online | 8 years, 11 months ago (Sept. 12, 2016) |
Published Print | 8 years, 10 months ago (Nov. 1, 2016) |
Funders
3
National Research Foundation of Korea
10.13039/501100003725
Region: Asia
pri (Trusts, charities, foundations (both public and private))
Labels
3
- 한국연구재단이 창의적 연구와
- National Research Foundation (South Korea)
- NRF
Awards
1
- NRF‐2015R1A2A2A11000907
Ministry of Science ICT and Future Planning
10.13039/501100004083
Region: Asia
gov (National government)
Labels
1
- MSIP
Ministry of Trade, Industry and Energy
10.13039/501100003052
Region: Asia
gov (National government)
Labels
2
- Ministry of Trade, Industry and Energy, Korea
- MOTIE
@article{Koo_2016, title={Near‐Infrared Saturable Absorption of Defective Bulk‐Structured WTe2 for Femtosecond Laser Mode‐Locking}, volume={26}, ISSN={1616-3028}, url={http://dx.doi.org/10.1002/adfm.201602664}, DOI={10.1002/adfm.201602664}, number={41}, journal={Advanced Functional Materials}, publisher={Wiley}, author={Koo, Joonhoi and Jhon, Young In and Park, June and Lee, Junsu and Jhon, Young Min and Lee, Ju Han}, year={2016}, month=sep, pages={7454–7461} }