Transmission Characteristics of Bright-Dark Soliton Pair in Fiber Lasers

Jia, 石佳 Shi; Juanfen, 王娟芬 Wang; Cong, 张聪 Zhang; Zhaoxia, 张朝霞 Zhang; Lingzhen, 杨玲珍 Yang

doi:10.3788/aos201838.0519001

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“…An initial modelocked pulse was generated due to the saturation absorption capacity of germanene nanosheets, and then the pulse was shaped into bright soliton and dark soliton under the balance between the dispersion and nonlinearity, gain, and losses. The nonlinear dynamics of BDS pulses has been simulated theoretically by Jia et al 52 Figure 6a depicts the variation between the average output power and the pump power. The video bandwidth (VBW) of the optical spectrum is 1 kHz.…”

Section: Laser Pulse Propertiesmentioning

confidence: 99%

Generation of Bright–Dark Pulses in Erbium-Doped Fiber Lasers Based on a Germanene-Saturable Absorber

Shi,

Xue,

et al. 2024

ACS Appl. Nano Mater.

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As a group IV graphene-like material, germanene has fast carrier relaxation time and excellent nonlinear saturable absorption properties, which make it have a broad application prospect in the field of optics. However, in the field of laser applications, it has not been sufficiently studied. In this study, the energy band and optical property calculations of germanene with two structural defects were performed based on the density functional theory. The germanene nanosheet prepared by a liquidphase exfoliation method was systematically characterized and analyzed. High-quality germanene-saturable absorbers were selected for application in erbium-doped fiber lasers. By adjusting the device, a bright−dark soliton with a fundamental frequency of 6.28 MHz and a single-pulse energy of 2.58 nJ was obtained. Meanwhile, the dark−dark−bright, dark−bright−dark, and dark−bright−bright solitons were also experimentally observed and characterized. The study shows that germanene nanosheets have excellent nonlinear saturable absorption properties for bright−dark soliton's modulation. It also provides theoretical and experimental bases for the application of germanene in the field of ultrafast lasers.

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Section: Laser Pulse Propertiesmentioning

confidence: 99%