KDP crystals are among the first non-linear crystals to
be used for the non-linear frequency conversion. The
important characteristics of this crystal are wide transparency
[2], high efficiency of frequency conversion,
and high damage threshold against high power lasers [3-
4]. The advantage of the growth of KDP crystals in
larger dimensions than other non-linear crystals [5] has
made it to be used in a wide range of applications,
especially in laser fusion [6-9]. The growth technique for
production of commercial crystals is based on gradual
temperature reduction. In this paper, the fabricated
system based on temperature reduction method (TRM),
procedure of crystal growth, and characterization