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It was demonstrated during the past decade that ultrashort intense laserpulse tightly focused deep inside a transparent dielectric generates the energydensity in excess of several MJ/cm3. Such energy concentration with extremelyhigh heating and quenching rates leads to unusual solid-plasma-solidtransformation paths overcoming kinetic barriers to formation of previouslyunknown high-pressure material phases, which are preserved in the surroundingpristine crystal. These results were obtained with the pulse of Gaussian shapein space and in time. Recently it was shown that the Bessel-shaped pulse couldtransform much larger amount of a material and allegedly create even higherenergy density than that was achieved with the Gaussian (GB) pulses. Here wepresent a succinct review of previous results and discuss the possible routesfor achieving higher energy density employing the Bessel beams (BB) and takeadvantage of its unique properties.

Extreme energy density confined inside a transparent crystal: Solid - plasma - solid transformations, status and perspectives