SnSe₂ Nanosheets for Subpicosecond Harmonic Mode‐Locked Pulse Generation

Abstract

Tin diselenide (SnSe2) nanosheets as novel 2D layered materials have excellent optical properties with many promising application prospects, such as photoelectric detectors, nonlinear optics, infrared photoelectric devices, and ultrafast photonics. Among them, ultrafast photonics has attracted much attention due to its enormous advantages; for instance, extremely fast pulse, strong peak power, and narrow bandwidth. In this work, SnSe2 nanosheets are fabricated by using solvothermal treatment, and the characteristics of SnSe2 are systemically investigated. In addition, the solution of SnSe2 nanosheets is successfully prepared as a fiber‐based saturable absorber by utilizing the evanescent field effect, which can bear a high pump power. 31st‐order subpicosecond harmonic mode locking is generated in an Er‐doped fiber laser, corresponding to the maximum repetition rate of 257.3 MHz and pulse duration of 887 fs. The results show that SnSe2 can be used as an excellent nonlinear photonic device in many fields, such as frequency comb, lasers, photodetectors, etc.

Titanium Disulfide Based Saturable Absorber for Generating Passively Mode-Locked and Q-Switched Ultra-Fast Fiber Lasers

“…Graphene possesses a wide absorption spectrum band due to its Dirac-like electronic band structure [ 22 , 23 ], but its zero-bandgap property also limits its wide potential applications [ 24 , 25 , 26 ]. Recently, based on the development of layered materials, novel nanomaterials such as transition metal dichalcogenides (TMDs), black phosphorus (BP), MXene, and topological insulators (TIs) have emerged as ultra-fast optical devices and shown excellent absorption performance [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ].…”

Palladium diselenide as a direct absorption saturable absorber for ultrafast mode-locked operations: from all anomalous dispersion to all normal dispersion

“…Especially, graphene has enormously promoted the development of mode-locked lasers due to its properties of wide absorption range, low saturation intensity, ultrafast recovery time and high damage threshold [12][13][14][15]. Under the encouragement of graphene, similar findings in other 2D nanomaterials such as topological insulators (TIs) [17][18][19][20], transition metal dichalcogenides (TMDs) [21][22][23][24][25][26][27][28][29][30][31][32][33][34], black phosphorus [35][36][37], MXenes [38,39], Xenes [40][41][42][43][44][45] and so on have been reported focusing their saturable absorption and laser propagation performance. Among them, TMDs exhibit significant essential applications in optoelectronic and biological fields [46][47][48].…”

Palladium selenide as a broadband saturable absorber for ultra-fast photonics

“…As is known, the zero-bandgap structure of graphene also brought great obstacles to its optoelectronic device applications. Since then, inspired by graphene, various 2D layered materials including multielemental (transition metal dichalcogenides (TMDs) [30][31][32][33][34][35][36][37][38][39][40][41], topological insulator (TIs) [42][43][44][45][46][47], ferromagnetic insulator (FIs) [48][49][50], metal chalcogenide [51,52], MXenes [53][54][55][56], etc.) and mono-elemental (Xenes (phosphorene [57][58][59][60][61][62][63][64][65][66], graphdiyne [67], antimonene [68], bismuthene [69][70][71], tellurene [72,73]) and selenene [74]) were prepared as mode lockers for obtaining pulsed fiber lasers extensively.…”