Glass doped with PbS quantum dots as a saturable absorber for 1-μm neodymium lasers

PbS quantum dots (QDs), a representative zero-dimensional material, have attracted great interest due to their unique optical, electronic, and chemical characteristics. Compared to one- and two-dimensional materials, PbS QDs possess strong absorption and an adjustable bandgap, which are particularly fascinating in near-infrared applications. Here, fiber-based PbS QDs as a saturable absorber (SA) are studied for dual-wavelength ultrafast pulses generation for the first time to our knowledge. By introducing PbS QDs SA into an erbium-doped fiber laser, the laser can simultaneously generate dual-wavelength conventional solitons with central wavelengths of 1532 and 1559 nm and 3 dB bandwidths of 2.8 and 2.5 nm, respectively. The results show that PbS QDs as broadband SAs have potential application prospects for the generation of ultrafast lasers.

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Stable passively Q-switched erbium-doped fiber laser incorporating a PbS quantum dots polystyrene composite film based saturable absorber

Applied Optics ◽

10.1364/ao.57.003231 ◽

2018 ◽

Vol 57 (12) ◽

pp. 3231 ◽

Cited By ~ 3

Author(s):

Xiaolan Sun ◽

Bin Zhou ◽

Chuanhang Zou ◽

Wei Zhao ◽

Qianqian Huang ◽

...

Keyword(s):

Quantum Dots ◽

Composite Film ◽

Fiber Laser ◽

Saturable Absorber ◽

Erbium Doped ◽

Pbs Quantum Dots

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Synergistic Effect Between Halide Perovskites and PbS Quantum Dots

10.29363/nanoge.icqd.2020.044 ◽

2020 ◽

Author(s):

Iván Mora-Seró ◽

Sofia Masi ◽

David Macias-Pinilla ◽

Carlos Echeverría-Arrondo ◽

Juan Ignacio Climente

Keyword(s):

Quantum Dots ◽

Synergistic Effect ◽

Halide Perovskites ◽

Pbs Quantum Dots

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A method for studying pico to microsecond time-resolved core-level spectroscopy used to investigate electron dynamics in quantum dots

Scientific Reports ◽

10.1038/s41598-020-79792-z ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Tamara Sloboda ◽

Sebastian Svanström ◽

Fredrik O. L. Johansson ◽

Aneta Andruszkiewicz ◽

Xiaoliang Zhang ◽

...

Keyword(s):

Quantum Dots ◽

Electron Injection ◽

Core Level ◽

Pump Laser ◽

Repetition Frequency ◽

Specific Information ◽

Single Experiment ◽

Time Resolved ◽

X Ray ◽

Pbs Quantum Dots

AbstractTime-resolved photoelectron spectroscopy can give insights into carrier dynamics and offers the possibility of element and site-specific information through the measurements of core levels. In this paper, we demonstrate that this method can access electrons dynamics in PbS quantum dots over a wide time window spanning from pico- to microseconds in a single experiment carried out at the synchrotron facility BESSY II. The method is sensitive to small changes in core level positions. Fast measurements at low pump fluences are enabled by the use of a pump laser at a lower repetition frequency than the repetition frequency of the X-ray pulses used to probe the core level electrons: Through the use of a time-resolved spectrometer, time-dependent analysis of data from all synchrotron pulses is possible. Furthermore, by picosecond control of the pump laser arrival at the sample relative to the X-ray pulses, a time-resolution limited only by the length of the X-ray pulses is achieved. Using this method, we studied the charge dynamics in thin film samples of PbS quantum dots on n-type MgZnO substrates through time-resolved measurements of the Pb 5d core level. We found a time-resolved core level shift, which we could assign to electron injection and charge accumulation at the MgZnO/PbS quantum dots interface. This assignment was confirmed through the measurement of PbS films with different thicknesses. Our results therefore give insight into the magnitude of the photovoltage generated specifically at the MgZnO/PbS interface and into the timescale of charge transport and electron injection, as well as into the timescale of charge recombination at this interface. It is a unique feature of our method that the timescale of both these processes can be accessed in a single experiment and investigated for a specific interface.

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