“…[15,16]. Compared with those mid-infrared materials, CdSe single crystal could meet the demand of birefringence wave plate better benefiting from its' wide infrared transparent band (0.750∼25 μm), high infrared transmittance and appropriate birefringence coefficient (∆n 0.017 = ) [15,[17][18][19][20], It is an excellent material for the preparation of mid-infrared polarization wave plates. Despite all these advantages, however, large size and high quality CdSe single crystal is also difficulty to obtain, therefore, the large size and high quality crystal growth method is strongly desired.…”