(a)
(b)
Figure 3: (a) Optical transmission of ZnSe film prepared using the PLD method and the ZnSe film after ultrasonic-assisted thermal treatment for 4 h, 8 h, and 12 h, respectively. (b) The photos behind are the corresponding ZnSe film treatment for 0 h, 4 h, 8 h, and 12 h.