Preparation of High Damage Threshold Device Based on Bi₂Se₃ Film and Its Application in Fiber Lasers

Abstract

As a handicap for passive mode-locked lasers to operate stably for a long time, the undesirable damage threshold of saturable absorption devices means that it is difficult to maintain a normal operation state under the irradiation brought by ultrashort pulses. To reduce the damage probability when the saturable absorption devices interact with an ultrafast laser, some technologies have been developed to resist the high-energy irradiation of an ultrafast laser that will also increase the difficulty of laser construction at the same time. In this paper we put forward a new research idea to improve the low-damage threshold problem: optimizing the optical transmittance, which will avoid dissociation due to excessive heat accumulation. Using the melt and machine exfoliation method, the high optical transmittance (>95%) saturable absorption devices based on Bi 2 Se 3 are prepared, whose damage threshold (2.45 mJ/cm 2 ) is nearly 5 times higher than commercial SESAM. The devices applied to generate femtosecond pulses exhibit exciting nonlinear optical effects, which enable the mode-locked fiber laser to operate with a pulse duration of 195 fs and a signal-to-noise ratio of 81.73 dB. This discovery not only proves that the passive mode-locked laser-based high transmittance Bi 2 Se 3 can obtain reliable pulse output, but also provides a new perspective for the selection of saturable absorption materials in the future.

Generation of bright‐dark Q‐switched pulse pair in thulium‐doped fiber laser cavity with titanium aluminum carbide absorber

“…Because of its good oxidation resistance, high melting point, good electrical and thermal conductivity, and excellent optical properties including nonlinearity, Ti 3 AlC 2 has been a very appealing material for laser application. The high damage threshold and robustness provided by Ti 3 AlC 2 are expected to be comparable to or better than the previous works 28,29 and thus it may arouse a growing upsurge in the innovation of high‐power pulsed lasers.…”

Third-order optical nonlinearities of Nb4C3 MXene and its application as an ultra-broadband mode-locker

“…33 Conventional soliton pulses with a pulse width of 195 fs at 1564 nm were generated with nanoscale-layered Bi 2 Se 3 . 34 Conventional solitons and soliton molecules were generated with InSb SA. 35 Q-Switched and mode-locked pulses were generated from the erbium-doped fiber ring cavity with Cr 2 O 3 SA.…”

InSb-based saturable absorbers for ultrafast photonic applications

“…[3][4][5] In the past decade, the enormous progress of 2D materials has motivated their application in pulsed lasers and in the field of ultrafast optics. [6][7][8][9] Most 2D materials inherently exhibit stronger nonlinear optical responses and light-matter interactions compared to their bulk counterparts, making them widely used in portable photonic applications. 10 Based on their outstanding attributes such as wide spectral bands, good mechanical flexibility, high damage thresholds, and fine compatibility with optical components, 2D materials have been widely used in nonlinear optical devices, such as photonic chips, all-optical modulators, optical sensors, saturable absorbers (SAs), and four-wave mixing generators.…”