Free-electron laser with 10^-15 meter wavelength for P-P fusion

[Green Xenon [Radium]]

Hi:

Can a free-electron laser emitting 10^-15 meter wavelength photons be
used ignite proton-proton fusion? If so, then how many
10^-15m-photons-per-second-per-square-meter would be necessary to start
the fusion?

Thanks,

Radium