Bi2Te3/Graphene Heterostructure as the Saturable Absorber for ~1.0 μm Passively Q-switched Solid State Pulsed Laser

Abstract

Due to the tunable nonlinear optical properties of the Bi2Te3/graphene heterostructure, stable solid state pulsed lasers based on the Bi2Te3/graphene saturable absorber have attracted intensive attention. In this work, the Bi2Te3/graphene heterostructure with good nonlinear absorption characteristics was synthesized by a self-assembly solvothermal route, and the optical saturable absorption properties of the saturable absorber were investigated. Owing to the large modulation depth of Bi2Te3 nanosheets and the high thermal conductivity of graphene, the Bi2Te3/graphene heterostructure saturable absorber shown good nonlinear saturable absorber performance and contributed the improved passively Q-switched Yb3+: GdAl3(BO3)4 pulsed laser when compared with that of the pure Bi2Te3 based Yb3+: GdAl3(BO3)4 laser, no matter pulse width or pulse energy. Our work demonstrates that the Bi2Te3/graphene heterostructure was a promising saturable absorber in ~1 μm solid-state pulsed lasers.

Characterization of charge-carrier dynamics at the Bi2Se3/MgF2 interface by multiphoton pumped UV–Vis transient absorption spectroscopy

“…This behavior suggests that the ultraslow hole dynamics in the 3D TI Bi 2 Se 3 can be controlled by the thickness of the MgF 2 layer, similar to how it occurs at the Si/SiO 2 interface [15]. Finally, we concluded that the observed dynamics of long-lived holes in the 3D TI Bi 2 Se 3 coated with a thin MgF 2 layer can be applied for designing new thin-film quantum materials that are promising for modern optoelectronics and optospintronics [55][56][57][58], also for metal-oxide-semiconductor field-effect transistor technology [59][60][61][62].…”

Fabrication and Applications of Heterostructure Materials for Broadband Ultrafast Photonics

“…[100] In the same year, Sun et al chose the hydrothermal method to prepare Bi 2 Te 3 /graphene heterostructure by a self-assembly solvothermal method. [68,101] They first synthesized graphene oxide (GO) with the improved Hummers method, [102] and fabricated Bi 2 Te 3 /graphene heterostructure. The hydrothermal method is promising and has been widely used in large-scale preparation of heterostructure materials.…”

“…Recently, scientists fabricated the bismuth telluride/graphene (Bi 2 Te 3 /graphene) heterostructure, whose exciton time was short and absorption was strong. [ 68 ] Heterostructure materials are prepared by the approach of mechanical transfer and chemical growth, realizing atomic‐level connections between different materials. Magnetron sputtering deposition (MSD) and liquid phase exfoliation (LPE) are two common methods of mechanical transfer, by both of which layered materials can be obtained.…”

“…The most popular method is chemical vapor deposition (CVD), in which the thickness of deposition can be controlled. [ 68 ] Since a decade ago, researchers have managed to fabricate a variety of heterostructure materials and applied them as SAs for ultrafast lasers of better performance. For example, pulsed lasers based on heterostructure materials consisting of graphene and Bi 2 Te 3 have exhibited ultrashort pulse width and high stability.…”

Variable Angle Spectroscopic Ellipsometry Characterization of Graphene Oxide in Methanol Films

“…The remarkable electrical, thermal, mechanical, optical, and long electron mean free paths properties of graphene make it compelling for various engineering applications [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”