High-efficiency second-order nonlinear processes in an optical microfibre assisted by few-layer GaSe

Biqiang Jiang; Zhen Hao; Yafei Ji; Yueguo Hou; Ruixuan Yi; Dong Mao; Xuetao Gan; Jianlin Zhao

doi:10.1038/s41377-020-0304-1

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High-efficiency second-order nonlinear processes in an optical microfibre assisted by few-layer GaSe

Original Articles

- High-efficiency second-order nonlinear processes in an optical microfibre assisted by few-layer GaSe
- Light: Science & Applications Vol. 9, Issue 3, Pages: 657-664(2020)
- Affiliations：
  
  MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China
- Author bio：
  
  Xuetao Gan (xuetaogan@nwpu.edu.cn)
  Jianlin Zhao (jlzhao@nwpu.edu.cn)
- Funds：
- DOI：10.1038/s41377-020-0304-1
  CLC：
- Published：2020，
  
  Published Online：17 April 2020，
  
  Received：12 November 2019，
  
  Revised：17 March 2020，
  
  Accepted：24 March 2020
- Accepted：
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Jiang, B. Q. et al. High-efficiency second-order nonlinear processes in an optical microfibre assisted by few-layer GaSe. Light: Science & Applications, 9, 657-664 (2020).
DOI：

Jiang, B. Q. et al. High-efficiency second-order nonlinear processes in an optical microfibre assisted by few-layer GaSe. Light: Science & Applications, 9, 657-664 (2020). DOI： 10.1038/s41377-020-0304-1.

摘要

Abstract

The centrosymmetric nature of silica fibre precludes the realisation of second-order nonlinear processes in optical fibre systems. Recently

the integration of 2D materials with optical fibres has opened up a great opportunity to develop all-fibre active devices. Here

we demonstrate high-efficiency second-order nonlinear frequency conversions in an optical microfibre assisted with few-layer gallium selenide (GaSe) nanoflakes. Attributed to the strong evanescent field of the microfibre and ultrahigh second-order nonlinearity of the GaSe nanoflakes

second harmonic generation (SHG) and sum-frequency generation (SFG) are effectively achieved with only sub-milliwatt continuous-wave (CW) lasers in the wavelength range of 1500-1620 nm

covering the C and L telecom bands. The SHG intensity from the microfibre is enhanced by more than four orders of magnitude with the assistance of the GaSe nanoflakes on fibre nonlinear processes. Moreover

in the SFG process

the intensity transfer between different frequencies can be effectively manipulated by changing the wavelengths and powers of two pump lasers. The realised strong second-order nonlinearity in the GaSe-integrated microfibre might expand the applications of all-fibre devices in all-optical signal processing and new light source generation at awkward wavelengths.

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references

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