Use of KDP crystal as a Kerr nonlinear medium for compressing PW laser pulses down to 10 fs

Andrey Shaykin; Vladislav Ginzburg; Ivan Yakovlev; Anton Kochetkov; Alexey Kuzmin; Sergey Mironov; Ilya Shaikin; Sergey Stukachev; Vladimir Lozhkarev; Artem Prokhorov; Efim Khazanov

doi:10.1017/hpl.2021.40

Journals >High Power Laser Science and Engineering >Volume 9 >Issue 4 >Page 04000e54 > Article

High Power Laser Science and Engineering
Vol. 9, Issue 4, 04000e54 (2021)

Use of KDP crystal as a Kerr nonlinear medium for compressing PW laser pulses down to 10 fs | Editors' Pick

Andrey Shaykin, Vladislav Ginzburg, Ivan Yakovlev, Anton Kochetkov, Alexey Kuzmin, Sergey Mironov, Ilya Shaikin, Sergey Stukachev, Vladimir Lozhkarev, Artem Prokhorov, and Efim Khazanov^*

Author Affiliations

Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod603950, Russia

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DOI: 10.1017/hpl.2021.40 Cite this Article Set citation alerts

Andrey Shaykin, Vladislav Ginzburg, Ivan Yakovlev, Anton Kochetkov, Alexey Kuzmin, Sergey Mironov, Ilya Shaikin, Sergey Stukachev, Vladimir Lozhkarev, Artem Prokhorov, Efim Khazanov. Use of KDP crystal as a Kerr nonlinear medium for compressing PW laser pulses down to 10 fs[J]. High Power Laser Science and Engineering, 2021, 9(4): 04000e54 Copy Citation Text

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Abstract

The input pulse of the laser PEARL with energy of 18 J and pulse duration of about 60 fs was compressed to 10 fs after passage through a 4-mm-thick KDP crystal and reflection at two chirped mirrors with sum dispersion of -200 fs². The experiments were performed for the В-integral values from 5 to 19 without visible damage to the optical elements, which indicates that small-scale self-focusing is not a significant issue. It was shown that, by virtue of the low dispersion of the group velocity, the KDP crystal has some advantages over silica: a larger pulse compression coefficient, especially at a small value of the В-integral (B = 5, …, 9), lower absolute values of chirped mirror dispersion, and also a possibility to control the magnitude of nonlinearity and dispersion by changing crystal orientation.

Keywords

CafCA petawatt lasers post-compression self-phase modulation small-scale self-focusing thin film compression third-order nonlinearity

\begin{align}B=\left(2\pi /{\lambda}_0\right){Ln}_2{I}_{\mathrm{in}},\end{align}

((1))

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\begin{align}D=L\frac{k_2}{T_{\mathrm{F}}^2},\end{align}

((2))

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\begin{align}\frac{\partial a}{\partial \xi }\,{-}\,\frac{i\cdot D}{2}\frac{\partial^2a}{\partial {\eta}^2}\,{+}\,\frac{T}{6}\frac{\partial^3a}{\partial {\eta}^3}\,{=}-iB\left({\left|a\right|}^2\cdot a\,{-}\,\frac{2\cdot i}{\unicode{x3c0} \cdot N}\,\frac{\partial}{\partial \eta}\left({\left|a\right|}^2\cdot a\right)\right)\!,\end{align}

((3))