Infrared OPO temperature tuning based on periodically-poled lithium niobate

An optical parametric oscillator (OPO) based on periodically-poled lithium niobate (PPLN) and pumped by 1064.2-nm laser is demonstrated, which can be conveniently tuned by the means of changing its operating temperature. The parameters of the set-up and experimental results are introduced in this paper. We adjusted the operating temperature from 80 to 250 ℃, the output wavelength shifted from 1485.4 to 1540.7 nm. The average of the shifts is 0.33 nm/℃.     

高温超导YBaCuO薄膜的不稳定性实验

一、引言 高温氧化物超导材料一出现,科学家们就注意将它制成薄膜材料、以此迈向实用化。利用高温氧化物超导材料制造超导量子干涉探测器,高速微芯片,红外探测器、高温超导晶体管等是各国科学家应用开发的重要领域,其他如超导混频器、超导天线等可用于通信、军事等领域具有广阔的前途。已经发展了许多方法制备高温超导薄膜,诸如DC或RF磁控溅射、