Fig. 1. Experimental setup of the Fe²⁺∶ZnSe laser

Fig. 2. Time-domain characteristics of pump pulse and output pulse of Fe²⁺∶ZnSe laser. (a) Complete pulse waveform; (b) early stage waveform

Fig. 3. Variation of output energy of coated Fe²⁺∶ZnSe crystals with pump light energy with different OCs.(a) Crystal thickness is 3 mm; (b) crystal thickness is 6 mm

Fig. 4. Output characteristics of uncoated Fe²⁺∶ZnSe crystal. (a) Laser energy with different OCs; (b) variation of laser energy with pump energy when the crystal tilted by 45°

Fig. 5. Laser spot of uncoated Fe²⁺∶ZnSe crystal. (a) Normal incident; (b) 45° incident