Grating-free 2.8 μm Er:ZBLAN fiber chirped pulse amplifier

Yicheng Zhou; Zhipeng Qin; Xiabing Zhou; Guoqiang Xie

doi:10.1017/hpl.2022.36

Journals >High Power Laser Science and Engineering >Volume 10 >Issue 6 >Page 06000e41 > Article

High Power Laser Science and Engineering
Vol. 10, Issue 6, 06000e41 (2022)

Grating-free 2.8 μm Er:ZBLAN fiber chirped pulse amplifier

Yicheng Zhou, Zhipeng Qin^*, Xiabing Zhou, and Guoqiang Xie

Author Affiliations

School of Physics and Astronomy, Key Laboratory for Laser Plasmas (Ministry of Education), Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai, China

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DOI: 10.1017/hpl.2022.36 Cite this Article Set citation alerts

Yicheng Zhou, Zhipeng Qin, Xiabing Zhou, Guoqiang Xie. Grating-free 2.8 μm Er:ZBLAN fiber chirped pulse amplifier[J]. High Power Laser Science and Engineering, 2022, 10(6): 06000e41 Copy Citation Text

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Abstract

We report on a grating-free fiber chirped pulse amplifier (CPA) at 2.8 μm for the first time. The CPA system adopted Er:ZBLAN fiber with large anomalous dispersion as the stretcher and germanium (Ge) rods as the compressor with a compact structure. High-energy picosecond pulses of 2.07 μJ were generated at the repetition rate of 100 kHz. Using highly dispersive Ge rods, the amplified pulses were compressed to 408 fs with a pulse energy of 0.57 μJ, resulting in a peak power of approximately 1.4 MW. A spectral broadening phenomenon in the main amplifier was observed, which was caused by the special gain shape of the Er:ZBLAN fiber amplifier in operation and confirmed by our numerical simulation. This compact fiber CPA system at 2.8 μm will be practical and meaningful for application fields.

Keywords

Er:ZBLAN fiber fiber chirped pulse amplifier grating free mid-infrared

$$\begin{align}\frac{\partial U}{\partial z}-\sum \limits_{ij}{{g}}^{{\kern1.2pt}ij}\frac{U}{2}+i\frac{\beta_2}{2}\frac{\partial^2U}{\partial {t}^2}-\frac{\beta_3}{6}\frac{\partial^3U}{\partial {t}^3}= i\gamma U{\left|U\right|}^2,\end{align}$$

((1))

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$$\begin{align}{g}^{ij}\left(\nu \right)=\left({\sigma}_\mathrm{e}^{ij}{r}_2^{{\kern1.2pt}i}{N}_2-{\sigma}_\mathrm{a}^{ij}{r}_1^{{\kern1.2pt}j}{N}_1\right){f}^{{\kern1.2pt}ij}\left(\nu \right),\end{align}$$

((2))

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$$\begin{align}\frac{\mathrm{d}N_5}{\mathrm{d}t}&=-\frac{N_5}{\tau_5}+{W}_{22}{N}_2^2-{W}_{50}{N}_5{N}_0+{W}_{42}{N}_4{N}_2+{R}_{\mathrm{ESA}},\nonumber\\ \frac{\mathrm{d}N_4}{\mathrm{d}t}&=-\frac{N_4}{\tau_4}+{\beta}_{54}\frac{N_5}{\tau_5}-{W}_{42}{N}_4{N}_2,\nonumber\\ \frac{\mathrm{d}N_3}{\mathrm{d}t}&=-\frac{N_3}{\tau_3}+{\beta}_{53}\frac{N_5}{\tau_5}+{\beta}_{43}\frac{N_4}{\tau_4}+{W}_{11}{N}_1^2+{W}_{50}{N}_5{N}_0,\nonumber\\ \frac{\mathrm{d}N_2}{\mathrm{d}t}&=-\frac{N_2}{\tau_2}+\sum \limits_{i=3}^5{\beta}_{i2}\frac{N_i}{\tau_i}-2{W}_{22}{N}_2^2-{W}_{42}{N}_4{N}_2\nonumber\\&\quad+{R}_{\mathrm{GSA}}-{R}_{\mathrm{ESA}}-{R}_{\mathrm{ASE}}-{R}_{\mathrm{SE}},\nonumber\\ \frac{\mathrm{d}N_1}{\mathrm{d}t}&=-\frac{N_1}{\tau_1}+\sum \limits_{i=2}^5{\beta}_{i1}\frac{N_i}{\tau_i}-2{W}_{11}{N}_1^2+{W}_{50}{N}_5{N}_0+{W}_{42}{N}_4{N}_2\nonumber\\&\quad+{R}_{\mathrm{ASE}}+{R}_{\mathrm{SE}},\end{align}$$

((3))

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Yicheng Zhou, Zhipeng Qin, Xiabing Zhou, Guoqiang Xie. Grating-free 2.8 μm Er:ZBLAN fiber chirped pulse amplifier[J]. High Power Laser Science and Engineering, 2022, 10(6): 06000e41

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