InP/ZnSeS/ZnS Core-Shell Quantum Dots as Novel Saturable Absorbers in Mode-Locked Fiber Lasers

Lou, Yajun1; He, Pengfei2; Ge, Boyuan1; Duan, Xijian1; Hu, Lei3; Zhang, Xiaoli3; Tao, Lili2; Zhang, Xinhai1

2022-12-01

10.1002/adom.202201939

Advanced Optical Materials   影响因子和分区

2195-1071

In this study, red light emitting InP/ZnSeS/ZnS quantum dots (QDs) are prepared by thermal injection method. The results show that the InP/ZnSeS/ZnS QDs saturable absorbers (SA) have good nonlinear saturable absorption properties with modulation depth of 24.2% and saturation intensity of 0.08 KW cm(-2). Then the QD SAs are applied to the erbium-doped fiber laser (EDFL) ring cavity system, and a mode-locked laser pulse with a pulse width of 635 fs is generated. In addition, the pulse width is determined by the carrier recovery time, which is closely related to the defect density in the material. A large number of defects are eliminated in the QDs by hydrogen fluoride (HF) treatment, and the pulse width is reduced from 635 to 450 fs. Results of time-resolved photoluminescence and ultrafast transient absorption spectroscopy (TAS) show that HF treatment indeed reduces defects in InP/ZnSeS/ZnS QDs, indicated by the decrease of the carrier recovery time. This is different from the reported 2D SA materials, which usually reduce the carrier recovery time by increasing the defect density. This study will inspire new applications of QDs in ultrafast photonics and nonlinear optics.

carrier recovery time fiber lasers HF-treatment InP quantum dots mode-locking saturable absorbers

SCI ; EI

英语

第一 ; 通讯

[JCYJ20180504170604552] ; [KQTD2015071710313656] ; [JSGG20190822180401693] ; [JCYJ20210324115608024]

Materials Science ; Optics

Materials Science, Multidisciplinary ; Optics

WOS:000894196400001

WILEY-V C H VERLAG GMBH

20225113264355

Absorption spectroscopy ; Fiber lasers ; Fluorine compounds ; III-V semiconductors ; Light emission ; Locks (fasteners) ; Mode-locked fiber lasers ; Nanocrystals ; Nonlinear optics ; Optical properties ; Quantum dot lasers ; Recovery ; Saturable absorbers ; Semiconducting indium phosphide ; Semiconductor quantum dots ; Semiconductor quantum wells

Semiconducting Materials:712.1 ; Compound Semiconducting Materials:712.1.2 ; Semiconductor Devices and Integrated Circuits:714.2 ; Light/Optics:741.1 ; Nonlinear Optics:741.1.1 ; Lasers, General:744.1 ; Solid State Lasers:744.4 ; Semiconductor Lasers:744.4.1 ; Nanotechnology:761 ; Inorganic Compounds:804.2 ; Crystalline Solids:933.1

Web of Science

1.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
2.Guangdong Univ Technol, Sch Mat & Energy, Guangzhou 510006, Peoples R China
3.Guangdong Univ Technol, Sch Phys & Optoelect Engn, Guangzhou 510006, Peoples R China

Lou, Yajun,He, Pengfei,Ge, Boyuan,et al. InP/ZnSeS/ZnS Core-Shell Quantum Dots as Novel Saturable Absorbers in Mode-Locked Fiber Lasers[J]. Advanced Optical Materials,2022,11(3).

Lou, Yajun.,He, Pengfei.,Ge, Boyuan.,Duan, Xijian.,Hu, Lei.,...&Zhang, Xinhai.(2022).InP/ZnSeS/ZnS Core-Shell Quantum Dots as Novel Saturable Absorbers in Mode-Locked Fiber Lasers.Advanced Optical Materials,11(3).

Lou, Yajun,et al."InP/ZnSeS/ZnS Core-Shell Quantum Dots as Novel Saturable Absorbers in Mode-Locked Fiber Lasers".Advanced Optical Materials 11.3(2022).