Nonlinear optical properties of PtTe<sub>2</sub> based saturable absorbers for ultrafast photonics

He, Junshan; Lu, Haiming; Tao, Lili; Zhao, Yu; Zheng, Zhaoqiang; Zhou, Bo

doi:10.1039/d1tc05645j

Cited by 30 publications

(13 citation statements)

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“…Meanwhile, the observed on the oscilloscope shown in Figure 4b,c do not increase significantly anymore and the trace becomes rough. This phenomenon may attribute to the thermal accumulation and supersaturation of SA at high pumping level [7,20,30]. At QS stage, the pulse intensity is greatly improved due to the bleaching of the saturable absorber and the reduced intra-cavity loss.…”

Section: Q-switched Operationmentioning

confidence: 99%

“…One is introducing the nonlinear polarization evolution (NPE) effect to the fiber laser by using a polarization-dependent component, such as a polarizer [5], tapered fiber [6][7][8], or D-shaped fiber [9]. The other is dispersion management with significantly increased cavity length [10][11][12][13][14][15][16][17][18][19][20]; however, the repetition frequency of the laser is greatly reduced.…”

Section: Introductionmentioning

confidence: 99%

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Revealing the Evolution from Q-Switching to Mode-Locking in an Erbium-Doped Fiber Laser Using Tungsten Trioxide Saturable Absorber

et al. 2022

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Passively Q-switching and mode-locking technologies can generate short pulses with durations that differ by several orders of magnitude widely used in different applications. Recently, Q-switching and mode-locking realized in an identical laser cavity with saturable absorbers was reported. The analysis of pulse conversion is helpful for us to further understand the pulse dynamics of a laser. In this paper, the pulse evolution from Q-switching, Q-switched mode-locking to mode-locking, is demonstrated by using a tungsten trioxide saturable absorber in a ring-cavity erbium-doped fiber laser. Firstly, self-started Q-switching at 1563 nm is observed, the repetition rate continuously increases, and the duration decreases when the pump power increased. Then, with an adjusting intra-cavity state of polarization under a high pump power level, stable Q-switched mode-locking pulses evolved from Q-switching, are observed. The amplitude of the emerged pulse sequence with a period of 36.8 ns, determined by cavity length, is modulated by the Q-switched envelope with the period of 10.3 μs. By optimizing the intracavity polarization carefully, stable continuous wave mode-locking operation is achieved eventually. To the best of our knowledge, this is the first experimental demonstration of Q-switching and mode-locking, respectively, in an identical transition-metal-oxides-based pulsed fiber laser without modification of cavity structure.

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Section: Q-switched Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Revealing the Evolution from Q-Switching to Mode-Locking in an Erbium-Doped Fiber Laser Using Tungsten Trioxide Saturable Absorber

et al. 2022

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“…Suppose the maximum change in transmittance (or absorption) when the material reaches absorption saturation is α s , and the remaining loss is defined as α ns . [ 47 ] I sat is the optical intensity required to achieve half the modulation depth. Therefore, due to the reduction of defects after HF treatment, α s and α ns are reduced, and I sat has a small increase.…”

Section: Ultrafast Photonics Applicationsmentioning

confidence: 99%

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

Lou

et al. 2022

Advanced Optical Materials

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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.

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“…These materials illustrate remarkable physical characteristics varying from semimetal to metal and insulator to semiconductor, providing numerous unique optical and electrical properties. Since graphene was first demonstrated in 2009 as an SA in an ultrafast fiber laser, a variety of other 2D materials, such as MXenes, transition metal dichalcogenides (TMDs), perovskite, topological insulators (TIs), and VA group single-element materials, have been consecutively researched and proven to be exceptional SAs with numerous outstanding properties. − However, they usually exhibit the weakness of relatively poor long-term stability and low damage resistance.…”

Section: Introductionmentioning

confidence: 99%

GaSb Film is a Saturable Absorber for Dissipative Soliton Generation in a Fiber Laser

Pang

Meng

Zhao

et al. 2022

ACS Appl. Mater. Interfaces

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Nanotechnology is at the forefront of scientific research and offers great prospects for the development of technology. As a type of III-V semiconductor, GaSb materials exhibit numerous outstanding optical and electrical characteristics that are very promising for nonlinear optical device applications. In this study, the electronic band structures of GaSb are theoretically calculated, and its application in dissipative soliton fiber lasers is validated. A GaSb thin film is deposited on a microfiber using magnetron sputtering deposition, and the morphology, chemical composition, structure, and nonlinear optical characteristics of the proposed microfiber−GaSb device are investigated. After incorporating it into an Er-doped fiber laser, dissipative soliton laser pulses are readily obtained with a fundamental frequency of 43.5 MHz. With increasing pump power, the fiber laser could work in the fundamental frequency mode-locking state. At a pump power of 570 mW, the pulse width and the output power are measured to be 917 fs and 49.75 mW, separately. These results reveal that GaSb can be used as an efficient saturable absorber, which will have potential applications in ultrafast optics.

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Nonlinear optical properties of PtTe₂ based saturable absorbers for ultrafast photonics

Abstract: Platinum ditelluride (PtTe2) has many applications in phototransistors, photodetectors, photocatalysis and other fields due to its interesting semiconductor-to-semimetal transition property, ultrashort excited carrier lifetime, high carrier mobility, excellent air stability,...

Cited by 30 publications

References 58 publications

Revealing the Evolution from Q-Switching to Mode-Locking in an Erbium-Doped Fiber Laser Using Tungsten Trioxide Saturable Absorber

Revealing the Evolution from Q-Switching to Mode-Locking in an Erbium-Doped Fiber Laser Using Tungsten Trioxide Saturable Absorber

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

GaSb Film is a Saturable Absorber for Dissipative Soliton Generation in a Fiber Laser

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Nonlinear optical properties of PtTe2 based saturable absorbers for ultrafast photonics

Abstract: Platinum ditelluride (PtTe2) has many applications in phototransistors, photodetectors, photocatalysis and other fields due to its interesting semiconductor-to-semimetal transition property, ultrashort excited carrier lifetime, high carrier mobility, excellent air stability,...

Cited by 30 publications

References 58 publications

Revealing the Evolution from Q-Switching to Mode-Locking in an Erbium-Doped Fiber Laser Using Tungsten Trioxide Saturable Absorber

Revealing the Evolution from Q-Switching to Mode-Locking in an Erbium-Doped Fiber Laser Using Tungsten Trioxide Saturable Absorber

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

GaSb Film is a Saturable Absorber for Dissipative Soliton Generation in a Fiber Laser

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Nonlinear optical properties of PtTe₂ based saturable absorbers for ultrafast photonics