  Nuclear isomers play a key role in the creation of the elements in the
universe and have a number of fascinating potential applications related to the
controlled release of nuclear energy on demand. Particularly, $^{93m}$Mo isomer
is a good candidate for studying the depletion of nuclear isomer via nuclear
excitation by electron capture. For such purposes, efficient approach for
$^{93m}$Mo production needs to be explored. In the present work, we demonstrate
experimentally an efficient production of $^{93m}$Mo through $^{93}$Nb(p, n)
reaction induced by intense laser pulse. When a ps-duration, 100-J laser pulse
is employed, the $^{93m}$Mo isomer at 2425 keV (21/2$^+$, $T_{1/2}$ = 6.85 h)
are generated with a high yield of $1.8\times10^6$ particles/shot. The
resulting peak efficiency is expected to be $10^{17}$ particles/s, which is at
least five orders of magnitudes higher than using classical proton accelerator.
The effects of production and destruction of $^{93m}$Mo on the controversial
astrophysical p-isotope $^{92}$Mo are studied. It is found that the
$^{93}$Nb(p, n)-$^{93m}$Mo reaction is an important production path for
^{93m}Mo seed nucleus, and the influence of ^{93m}Mo-^{92}Mo reaction flow on
^{92}Mo production cannot be ignored. In addition, we propose to directly
measure the astrophysical rate of (p, n) reaction using laser-induced proton
beam since the latter one fits the Maxwell-Boltzmann distribution well. We
conclude that laser-induced proton beam opens a new path to produce nuclear
isomers with high peak efficiency towards the understanding of p-nuclei
nucleosythesis.
