Quantum-sized topological insulators/semimetals enable ultrahigh and broadband saturable absorption

Chen, Zhexue; Sui, Xinyu; Li, Zhangqiang; Li, Yueqi; Liu, Xinfeng; Zhang, Yong

doi:10.1039/d3nh00282a

Nanoscale Horiz.

2023

DOI: 10.1039/d3nh00282a

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Quantum-sized topological insulators/semimetals enable ultrahigh and broadband saturable absorption

Zhexue Chen,

Xinyu Sui,

Zhangqiang Li

et al.

Abstract: Two-dimensional topological insulators/semimetals have recently attracted much attention. However, quantum-sized topological insulators/semimetals with intrinsic characteristics have never been reported before. Herein, we report the high-yield production of topological insulator (i.e.,...

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2024

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Cited by 2 publications

References 52 publications

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Advancements in the Use of Artificial Saturable Absorbers for Modelocking of 2 µm Ultrafast Fiber Lasers

Raj R,

Saha,

Mondal

2024

Annalen der Physik

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Over the past decade, the research on modelocked 2 fiber lasers has increased rapidly. Conventionally, modelocking is achieved with the existing quantum well structures as well as 2D materials classified as Real Saturable Absorbers. As time progressed and keeping in mind the versatility, stability and robustness, demonstration of 2 fiber lasers that are modelocked by Artificial Saturable Absorbers (ASA) gained importance. This class of Saturable Absorbers exhibits interesting properties, which can make them the best candidate to replace real material‐based Saturable Absorbers. The progress of ASA based modelocking schemes in the 2 regime is explored and discussed in detail, along with its underlying physics, citing the various uses and the increasing market for ultrafast fiber lasers. Toward the end of this review, a comparison is drawn between different ASAs based modelocking schemes to get the most favorable conditions for desired output parameters as per one's needs. These fiber lasers with an all‐fiber ASA foundation have potential uses in the fields of medical, LIDAR, mid‐IR generation, environmental sensing, industrial, and defence.

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Advancements in the Use of Artificial Saturable Absorbers for Modelocking of 2 µm Ultrafast Fiber Lasers

Raj R,

Saha,

Mondal

2024

Annalen der Physik

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Bandwidth modulation and pulse characterization of passively Q-switched erbium-doped fiber laser

Muhammad,

Hamdan

2024

Laser Phys.

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We demonstrate the modulation of laser bandwidth by utilizing an ultranarrow tunable bandpass filter (UNTBF) in a passively Q-switched erbium-doped fiber laser. The passive Q-switch mechanism is enabled by using carbon nanotubes as saturable absorber at a Q-switched threshold of 35.5 mW. Based on spectral filtering effect introduced by the UNTBF, the 3 dB laser bandwidth can be tuned from 0.016 nm to 0.478 nm at a fixed pump power of 75.9 mW. The corresponding pulse behavior for each different bandwidth is characterized, and the results reveals that the pulse width can be as well tuned from 7.8 to 2.6 μs against the laser bandwidth, which agrees with the rule of time-bandwidth product. Correspondingly, the pulse repetition rate and the pulse energy vary from 16.23 kHz to 26.16 kHz and from 0.67 to 1.03 μJ respectively across the laser bandwidth. Further investigation of the pulse performance is performed against the pump power increment up to 107.2 mW. To the best of our knowledge, this is the first demonstration of spectrum bandwidth modulation in a passively Q-switched fiber laser, which can be useful for fully exploiting the possibilities of Q-switched pulse applications.

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Quantum-sized topological insulators/semimetals enable ultrahigh and broadband saturable absorption

Abstract: Two-dimensional topological insulators/semimetals have recently attracted much attention. However, quantum-sized topological insulators/semimetals with intrinsic characteristics have never been reported before. Herein, we report the high-yield production of topological insulator (i.e.,...

Cited by 2 publications

References 52 publications

Advancements in the Use of Artificial Saturable Absorbers for Modelocking of 2 µm Ultrafast Fiber Lasers

Advancements in the Use of Artificial Saturable Absorbers for Modelocking of 2 µm Ultrafast Fiber Lasers

Bandwidth modulation and pulse characterization of passively Q-switched erbium-doped fiber laser

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