Niobium tellurium as a novel broadband saturable absorber for pulsed fiber lasers

Abstract

Niobium tellurium (NbTe2) as known as a kind of typical layered metallic transition metal dichalcogenides (MTMDCs), has drawn considerable attention because of its extraordinary physical properties, such as superconductivity, and...

VTe2: Broadband Saturable Absorber for Passively Q-Switched Lasers in the Near- and Mid-Infrared Regions

“…This crystal structure is similar to other TMDCs such as MoS 2 and WS 2 . 60 In order to theoretically analyze the band structure−properties of VTe 2 , density functional theory (DFT) was employed to calculate the electronic band structures of both the VTe 2 monolayer and bulk form. 65−67 The Perdew−Burke−Ernzerhof generalized gradient approximation (PBE-GGA) with the projector-augmented-wave (PAW) method was used.…”

“…59 While, until now, only NbTe 2 and TaTe 2 have been investigated as SAs in mode-locked fiber lasers and PQS solid-state lasers, respectively. Experimentally, Zhang et al 60 and Shang et al 61 investigated the nonlinear optical properties in a mode-locked fiber laser with NbTe 2 −PVA film SA as the mode-locked device and proved that NbTe 2 demonstrates as a broadband SA to produce mode-locked pulses within fiber lasers. Niu et al demonstrated a PQS Tm:YAP laser by using TaTe 2 -based SA.…”

“…Our analysis indicates that the both bulk and monolayer forms of VTe 2 exhibit a band gap of 0 eV at the Fermi level, confirming its classification as a metallic-type transition metal dichalcogenide, which is consistent with an earlier study in NbTe 2 . 60 Remarkably, it exhibits zero bandgap, indicating wavelength-insensitive optical response properties, and has been identified as a promising candidate for broadband laser applications. Based on previous studies, we believe that VTe 2 will also have excellent saturable absorption properties and can be applied to laser modulation at a variety of wavelengths.…”

Gold Nanomaterial‐Based Optical Modulators for Wideband Pulse Laser Generation

“…In recent years, layered transition metal dichalcogenides (TMDs) as SAs have also been demonstrated; however, their applications in the nearand mid-infrared bands are limited owing to their large bandgaps in the visible waveband (MoSe 2 : %1.7 eV, MoS 2 : %1.8 eV, and WS 2 : %2.1 eV). [15][16][17][18][19][20][21][22] Hence, identifying new SA materials for Pulsed lasers have wide applications in several fields, such as basic research, telecommunications, and industrial materials processing. A saturable absorber (SA) is a key component for pulse laser generation.…”

“…In recent years, layered transition metal dichalcogenides (TMDs) as SAs have also been demonstrated; however, their applications in the near‐ and mid‐infrared bands are limited owing to their large bandgaps in the visible waveband (MoSe 2 : ≈1.7 eV, MoS 2 : ≈1.8 eV, and WS 2 : ≈2.1 eV). [ 15–22 ] Hence, identifying new SA materials for pulse laser generation is significantly important for ultrafast photonics and related applications.…”