Liu, Zehua; Li, Jingzhen; Zhang, Ling; Zhang, Yu; Yang, Song; Bai, Zhenxu; Wang, Yulei; Lu, Zhiwei; Yan, Dapeng; Qi, Yaoyao; Zhang, XingWang Source: Advanced Optical Materials, 2024; E-ISSN: 21951071; DOI: 10.1002/adom.202401165; Publisher: John Wiley and Sons Inc

Articles not published yet, but available online Article in Press

Author affiliation:

Center for advanced Laser Technology, Hebei University of Technology, Tianjin; 300401, China

Hebei Key Laboratory of Advanced Laser Technology and Equipment, Tianjin; 300401, China

Key Lab of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing; 100083, China

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China

Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, 999077, Hong Kong

Wuhan Raycus Co., Ltd., Wuhan; 430223, China

Abstract:

Ultrafast vortex beams have significant scientific and practical value because of their unique phase properties in both the longitudinal and transverse modes, enabling multi-dimensional quantum control of light fields. Directly generating watt-level ultrafast vortex beams with large angular momentum has remained a major challenge due to the limitations of mode-locked materials and existing spatiotemporal mode-locking generation methods. In this study, quasi-2D PEA2(CsPbBr3)n-1PbBr4 perovskite films are prepared by an anti-solvent method and employed for the first time in a mode-locked resonator operating in free space. Utilizing the angle-based non-collinear pumping and frequency doubling techniques, the second-order ultrafast green vortex beams with a power of up to 1.05 W and a duration of 373 ps are generated. Experimental findings demonstrate the strong nonlinear saturable absorption properties of quasi-2D PEA2(CsPbBr3)n-1PbBr4 perovskite films at high power levels, highlighting their considerable potential in ultrafast laser technology and nonlinear optics.