Fo
rmation of th
ree-dimensional (3D) patte
rns of 0.2–0.5 μm diamete
r voids inside a t
ranspa
rent solid has been demonst
rated. The nano-voids could be c
reated with a spacing
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rt, simila
r"" bo
rde
r=0>2 μm thus suggesting the possibility of pe
rmanent 3D optical memo
ry with density
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rde
r=0>100 Gbit/cm
3. Ext
remely high p
ressu
res of
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rde
r=0>10 TPa and tempe
ratu
res up to 10
5 K can be p
roduced by a single sub-picosecond lase
r pulse tightly focused inside t
ranspa
rent dielect
rics. Analysis of the size of the void and the shock affected zone as a function of the deposited ene
rgy shows that the expe
rimental
results can be explicitly unde
rstood on the basis of conse
rvation laws and be modeled by plasma hyd
rodynamics. The
refo
re, the size of the void can be cont
rolled and p
redicted by p
rope
r focusing conditions and lase
r pa
ramete
rs.