The invention relates to an RbZn2BO3Cl2
nonlinear optical crystal, preparation and application. The
crystal does not have a symmetric center, belongs to a
trigonal crystal system, has a
space group ofR32, and has the
cell parameters of: a=4.9698angstrom, b=4.9698angstrom, c= 27.178angstrom, alpha=beta=90degree, and gamma=120degree. A
single crystal can be obtained in a self-
flux system by a
spontaneous nucleation method; a high temperature
solid phase synthesis method is employed to obtain
solid powder; high temperature melt spontaneous
crystallization process growth is carried out to obtainlaminar and transparent
single crystal without wrappage, the obtained
crystal has wide light-transmitting
wave band, and has
high transmittance at 300-2000nm, and the
ultraviolet cut-off edge is lessthan 200nm;
powder frequency-doubling effect test shows that the crystal can achieve
phase matching and the frequency-doubling effect is equivalent to that of KBe2BO3F2 crystal; the crystal has the advantages of high
hardness, good mechanical properties, difficult fragmentation and deliquescence, easy
processing and preservation, etc.; and the crystal can be used for preparation of
nonlinear optical devices.