Longwave mid-IR femtosecond pulse sources driven by ultrafast fiber lasers (Invited)

Yang Liu; Qian Cao; Xincai Diao; Zhiyi Wei; Guoqing Chang

doi:10.3788/IRLA20210368

Journals >Infrared and Laser Engineering >Volume 50 >Issue 8 >Page 20210368 > Article

Infrared and Laser Engineering
Vol. 50, Issue 8, 20210368 (2021)

Longwave mid-IR femtosecond pulse sources driven by ultrafast fiber lasers (Invited)

Yang Liu¹, Qian Cao², Xincai Diao¹, Zhiyi Wei¹, and Guoqing Chang¹

Author Affiliations

¹Key Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

²School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

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DOI: 10.3788/IRLA20210368 Cite this Article

Yang Liu, Qian Cao, Xincai Diao, Zhiyi Wei, Guoqing Chang. Longwave mid-IR femtosecond pulse sources driven by ultrafast fiber lasers (Invited)[J]. Infrared and Laser Engineering, 2021, 50(8): 20210368 Copy Citation Text

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Abstract

The mid-IR femtosecond sources based on difference-frequency generation exhibit many attractive features such as wide wavelength tuning range (6-20 μm), wide coverage range (the entire “fingerprint” region), and low system complexity. Ultrafast fiber laser driven mid-IR fs sources have higher system stability for using less spatial light path only in difference-frequency part. In this article, the different fiber nonlinear frequency conversion techniques in difference-frequency generation were reviewed. The methods improving mid-IR pulse power in different-frequency generation process were introduced in detail.

Keywords

difference-frequency generation fiber laser fs mid-IR light source mid-infrared crystal nonlinear fiber optics technology

$ \begin{split} &\frac{\partial {A}_{1}({\textit{z}},\tau )}{\partial {\textit{z}}}+\left(\dfrac{1}{{\upsilon }_{g,1}}-\dfrac{1}{{\upsilon }_{g,3}}\right)\frac{\partial {A}_{1}\left({\textit{z}},\tau \right)}{\partial \tau }+\frac{i{\;\beta }_{2,1}}{2}\frac{{\partial }^{2}{A}_{1}\left({\textit{z}},\tau \right)}{\partial {\tau }^{2}}=\\ &i\frac{{\omega }_{1}{d}_{eff}}{{n}_{1}c}{A}_{3}{A}_{2}^{*}{\rm e}^{-i{\Delta }k{\textit{z}}}, \end{split} $

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$ \begin{split} &\dfrac{\partial {A}_{2}({\textit{z}},\tau )}{\partial {\textit{z}}}+\left(\dfrac{1}{{\upsilon }_{g,2}}-\dfrac{1}{{\upsilon }_{g,3}}\right)\frac{\partial {A}_{2}\left({\textit{z}},\tau \right)}{\partial \tau }+\dfrac{i{\;\beta }_{\mathrm{2,2}}}{2}\dfrac{{\partial }^{2}{A}_{2}\left({\textit{z}},\tau \right)}{\partial {\tau }^{2}}=\\ &i\dfrac{{\omega }_{2}{d}_{eff}}{{n}_{2}c}{A}_{3}{A}_{1}^{*}{\rm e}^{-i{\Delta }k{\textit{z}}}, \end{split} $

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$ \dfrac{\partial {A}_{3}({\textit{z}},\tau )}{\partial {\textit{z}}}+\frac{i{\;\beta }_{\mathrm{2,3}}}{2}\dfrac{{\partial }^{2}{A}_{3}\left({\textit{z}},\tau \right)}{\partial {\tau }^{2}}=i\frac{{\omega }_{3}{d}_{eff}}{{n}_{3}c}{A}_{1}{A}_{2}^{*}{\rm e}^{+i{\Delta }k{\textit{z}}}{\text{。}} $

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