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We demonstrate coherent hard electromagnetic radiation generation fromreflection by the electron density singularity formed at the relativistic bowwave in laser plasma via particle-in-cell simulations. Wake and bow wavesdriven by an intense laser pulse form an electron density singularity at thelaser pulse front where they join. A counter-propagating laser pulse isreflected at the electron density modulations moving with relativisticvelocity. The reflected electromagnetic pulse is compressed and its frequencyis upshifted. Its frequency spectrum contains relativistic harmonics of thedriver pulse frequency generated at the bow wave front, all upshifted with thesame factor as the fundamental mode of the incident light.

Boosted High Order Harmonics from Electron Density Singularity Formed at the Relativistic Laser Bow Wave