Method for growing long-seed DKDP crystal by two-dimensional motion

A method for growing a long-seed DKDP crystal by two-dimensional motion, comprising:

• mounting a two-dimensional motion motor on an upper part of a growth tank and connecting a lower end of the two-dimensional motion motor to a connecting rod of a crystal carrying frame,
• placing a long-seed DKDP crystal on the crystal carrying frame,
• driving the crystal carrying frame with the long-seed DKDP crystal to periodically translating on a horizontal plane according to a square motion track in a growth solution in the growth tank by the two-dimensional motion motor in a motion mode, and
• growing the long-seed DKDP crystal along all cylindrical surfaces in the growth tank to obtain a DKDP crystal with no quality restriction of a cylinder-cone interface until growth of the long-seed DKDP crystal ends,
• wherein the motion mode is performing uniformly accelerated linear motion at an acceleration velocity a from 0—maintaining a uniform linear motion after a velocity reaches V—performing uniformly decelerated linear motion at an acceleration a until the velocity decreases to 0 on all four sides of the square motion track,
• the accelerated velocity a of the uniformly accelerated linear motion is in a range of 0.01 to 1 m/s2, and the velocity V of the maintained uniformly linear motion is in a range of 0.01 to 1 m/s.