Tunable and Robust Mid-Infrared Saturable Absorber Employing Tungsten Doping Cadmium Oxide

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Mengxia Wang
  • Ying Wang
  • Yi Wu
  • Hao Ma
  • Hang Jiang
  • Yuanan Zhao
  • Yujie Peng
  • Wenkai Li
  • Yuxin Leng
  • Jianda Shao

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number2307234
Journal / PublicationAdvanced Functional Materials
Volume34
Issue number1
Online published20 Sept 2023
Publication statusPublished - 2 Jan 2024

Abstract

Mid-infrared (MIR) pulsed lasers operating at 2–5 µm have important applications in communication, sensing, and medicine. However, the lack of robust MIR saturable absorbers (SAs) remains a major obstacle. Here, a semiconductor material cadmium oxide (CdO) film with high laser-induced damage threshold (800 nm, 134 mJ cm−2) and broadband saturable absorption (2.0–3.9 µm) is investigated. The effective tuning of the nonlinear optical response of CdO is demonstrated by adjusting the carrier concentration via a tungsten (W)-doping scheme. The saturable absorption is improved and carrier relaxation process is accelerated after increasing the W-dopant level. Based on these findings, the robust CdO-SAs with customizable parameters are realized and Q-switched lasers with decreasing pulse width from 372 to 254.3 ns are obtained at 2 µm. The design flexibility provided by CdO opens up a large parameter space that enables the continuous improvement of compact and high-performance MIR ultrafast lasers. © 2023 Wiley-VCH GmbH.

Research Area(s)

  • cadmium oxide, laser-induced damage threshold, passively Q-switched, saturable absorbers

Citation Format(s)

Tunable and Robust Mid-Infrared Saturable Absorber Employing Tungsten Doping Cadmium Oxide. / Wang, Mengxia; Wang, Ying; Wu, Yi et al.
In: Advanced Functional Materials, Vol. 34, No. 1, 2307234, 02.01.2024.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review