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

show less

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

show less

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{aligned} \frac{\partial A_{1} (z, τ)}{\partial z} + (\frac{1}{υ_{g, 1}} - \frac{1}{υ_{g, 3}}) \frac{\partial A_{1} (z, τ)}{\partial τ} + \frac{i β_{2, 1}}{2} \frac{\partial^{2} A_{1} (z, τ)}{\partial τ^{2}} = \\ i \frac{ω_{1} d_{e f f}}{n_{1} c} A_{3} A_{2}^{*} e^{- i Δ k z}, \end{aligned}

()

View in Article

\begin{aligned} \frac{\partial A_{2} (z, τ)}{\partial z} + (\frac{1}{υ_{g, 2}} - \frac{1}{υ_{g, 3}}) \frac{\partial A_{2} (z, τ)}{\partial τ} + \frac{i β_{2, 2}}{2} \frac{\partial^{2} A_{2} (z, τ)}{\partial τ^{2}} = \\ i \frac{ω_{2} d_{e f f}}{n_{2} c} A_{3} A_{1}^{*} e^{- i Δ k z}, \end{aligned}

()

View in Article

$ \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{。}} $

()