Jhon, Young In Koo, Joonhoi Anasori, Babak Seo, Minah Lee, Ju Han Gogotsi, Yury Jhon, Young Min 2024-01-20T00:32:15Z 2024-01-20T00:32:15Z 2021-09-03 2017-10 0935-9648 https://pubs.kist.re.kr/handle/201004/122259 2D transition metal carbides, nitrides, and carbonitides called MXenes have attracted much attention due to their outstanding properties. However, MXene's potential in laser technology is not explored. It is demonstrated here that Ti3CN, one of MXene compounds, can serve as an excellent mode-locker that can produce femtosecond laser pulses from fiber cavities. Stable laser pulses with a duration as short as 660 fs are readily obtained at a repetition rate of 15.4 MHz and a wavelength of 1557 nm. Density functional theory calculations show that Ti3CN is metallic, in contrast to other 2D saturable absorber materials reported so far to be operative for mode-locking. 2D structural and electronic characteristics are well conserved in their stacked form, possibly due to the unique interlayer coupling formed by MXene surface termination groups. Noticeably, the calculations suggest a promise of MXenes in broadband saturable absorber applications due to metallic characteristics, which agrees well with the experiments of passively Q-switched lasers using Ti3CN at wavelengths of 1558 and 1875 nm. This study provides a valuable strategy and intuition for the development of nanomaterial-based saturable absorbers opening new avenues toward advanced photonic devices based on MXenes. English WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Metallic MXene Saturable Absorber for Femtosecond Mode-Locked Lasers Article 10.1002/adma.201702496 1 Advanced Materials, v.29, no.40 Advanced Materials 29 40 N scie scopus 000413406200006 2-s2.0-85024113189 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article FIBER LASER ABSORPTION DELAMINATION CARBIDES WS2 GENERATION TI3C2 2D materials femtosecond lasers MXenes saturable absorptions Ti3CN