Based on the extra pressure assisted, the batch, high-purity polycrystalline materials CdSe were synthesized directly, and high-optical quality single crystals with dimensions of (50-55) mm×(80-100) mm were grown by high pressure seeded-aided Bridgman technique. Some devices with certain phase matching angles and dimensions about (6-8)2×(40-50) mm3 were fabricated. The absorption coefficients of the devices under o, e polarized lights at 2.1 μm, 2.6 μm, 10.8 μm were ≤0.02 cm-1, ≤0.02 cm-1, ≤0.01 cm-1, respectively. Through optical parametric oscillation laser experiments, the devices realize 1.05 W power output within 10.1-10.8 μm far-infrared wavelength.