Environmentally stable black phosphorus saturable absorber for ultrafast laser

Nanophotonics

article

Xinxin Jin¹  Guohua Hu²  Meng Zhang¹  Tom Albrow-Owen²  Zheng Zheng¹  Tawfique Hasan² 

[1] School of Electronic and Information Engineering, Beihang University;Cambridge Graphene Centre, University of Cambridge;Department of Electronic Engineering, The Chinese University of Hong Kong;Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, Beihang University

关键词: 2D materials;    black phosphorus;    fiber laser;   

DOI  :  10.1515/nanoph-2019-0524

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Black phosphorus (BP) attracts huge interest in photonic and optoelectronic applications ranging from passive switch for ultrafast lasers to photodetectors. However, the instability of chemically unfunctionalized BP in ambient environment due to oxygen and moisture remains a critical barrier to its potential applications. Here, the parylene-C layer was used to protect inkjet-printed BP-saturable absorbers (BP-SA), and the efficacy of this passivation layer was demonstrated on the stable and continuous operation of inkjet-printed BP-SA in harsh environmental conditions. BP-SA was integrated in an erbium-doped ring laser cavity and immersed in water at ~60°C during operation for investigation. Mode-locked pulses at ~1567.3 nm with ~538 fs pulse width remained stable for >200 h. The standard deviation of spectral width, central wavelength, and pulse width were 0.0248 nm, 0.0387 nm, and 2.3 fs, respectively, in this period, underscoring the extreme stability of BP-SA against high temperature and humidity. This approach could enable the exploitation of BP-based devices for photonic applications when operating under adverse environmental conditions.

【 授权许可】

CC BY