Broadband CrOCl Saturable Absorber with a Spectral Region Extension to 10.6 µm

Mengxia WANG, Jian ZHANG, Zhang WANG, Ci WANG, Sander VAN SMAALEN, Hang XIAO, Xi CHEN, Chenlin DU, Xinguang XU, Xutang TAO

Research output: Journal PublicationsJournal Article (refereed)peer-review

18 Citations (Scopus)


Nonlinear optical (NLO) materials with saturable absorption have attracted increasing attention because of their broad applications in the fields of optical communication, materials processing, biological detection, and surgery. However, their development is limited in the mid-infrared (IR) range due to a lack of available materials with a wideband NLO response. Herein, the optical properties and applications of the transition metal oxychloride CrOCl, which has a broadband transparent region (0.8–18 µm) and a high laser damaged threshold, are studied. The saturable absorption of CrOCl is characterized at 1.06, 1.5, 2.0, 2.5, and 10.6 µm with nanosecond lasers by the Z-scan method. With CrOCl as the saturable absorber (SA), passively Q-switched solid-state lasers are successfully realized at 1.06, 1.33, and 1.87 µm. This study is the first to report the use of a Cr3+ material as an optical SA. The high transmittance and wideband NLO response of CrOCl indicate that CrOCl can be an excellent NLO IR material with extensive application potential in photonics.
Original languageEnglish
Article number1901446
JournalAdvanced Optical Materials
Issue number2
Early online date6 Nov 2019
Publication statusPublished - 17 Jan 2020
Externally publishedYes

Bibliographical note

Single crystals of CrOCl were grown by Alfred Suttner and Kerstin Küspert at the Laboratory of Crystallography in Bayreuth. This work was supported by the Natural Science Foundation of Shandong Province (ZR2017MF031), Deutsche Forschungsgemeinschaft (DFG, German Research Foundation, 386411512), the Key Research and Development Program of Shandong Province (Grant Nos. 2017GGX20116 and 2018JMRH0207), and the National Natural Science Foundation of China (51502157).


  • broadband transparent region
  • CrOCl
  • passively Q-switched lasers
  • saturable absorption


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