The high purity and high quality CdTe single crystals were grown by the sublimation method either under excess Te of less than 0.02% or not.In this paper

the holographic phase-contrast microphotography is introduced to the research of high temperature growth of single crystal for the first time. The growth ampoul and furnace with parallel windows were designed.The principle of this technique was discussed and the efforts were made to obtain the experiment conditions for best results. Three-dimensional observing and. recording of the growth process in real time were obtained

and an accuracy of 3.9μm was achieved.The boundary layers were recorded under both growth and dissolution processes as well as various superaturation Δ

T

which is the temperature differ onee between crystal and source. The results suggested that the absorption layer become thicker with

the Δ

T

increasing.