Table 1 Hot electron yield \({Y}_{{e}^{-}}\) and positron yield \({Y}_{{e}^{+}}\).

From: Copious positron production by femto-second laser via absorption enhancement in a microstructured surface target

Laser intensity

\({{\bf{Y}}}_{{{\bf{e}}}^{-}}\) (>5 MeV) (planar target)

\({{\bf{Y}}}_{{{\bf{e}}}^{{\boldsymbol{+}}}}\) (planar target)

\({{\bf{Y}}}_{{{\bf{e}}}^{-}}\) (>5 MeV) (MST)

\({{\bf{Y}}}_{{{\bf{e}}}^{+}}\) (MST)

\({a}_{0}=5\)

0

0

\(1.1\times {10}^{10}\)

\(2.3\times {10}^{8}\)

\({a}_{0}=10\)

0

0

\(1.1\times {10}^{11}\)

\(1.4\times {10}^{9}\)

\({a}_{0}=15\)

\(4.9\times {10}^{8}\)

\(8.5\times {10}^{4}\)

\(1.7\times {10}^{11}\)

\(3.5\times {10}^{9}\)

\({a}_{0}=20\)

\(4.1\times {10}^{9}\)

\(2.7\times {10}^{6}\)

\(2.3\times {10}^{11}\)

\(7.2\times {10}^{9}\)