物理学报Issue(1)：014209-1-014209-6,6.DOI:10.7498/aps.65.014209
基于光参量变频与放大的高灵敏红外成像技术∗
Sensitive detection of ultra-weak infrared image using parametric frequency up-conversion and amplification
摘要
Abstract
Optical parametric frequency up-conversion and amplification, used for ultra-weak infrared image detection, is investigated both numerically and experimentally. A circum-circle model of spatial filtering is proposed to suppress the parametric fluorescence background noise. Combining the spatial filter, image relay module and band-pass filter, the fluorescence noise is suppressed by 70%. Accordingly, the image quality is significantly improved and the peak signal-to-noise ratio is increased by 22%. Based on the 10 Hz, mJ-level, 355 nm picosecond pump laser, the weak infrared image is amplified and up-converted into the visible region, and over 1.3 × 108 (82 dB) optical gain is obtained at the same time. Our experiment demonstrates that the detection sensitivity of the conventional uncooled CCD can be as high as 7.4 photons per pixel when the high gain OPA is used as an image preamplifier. The scheme in this paper is expected to be used in single-photon-level sensitive infrared imaging.关键词
光参量放大/光学增益/外接圆模型/峰值信噪比Key words
optical parametric amplification/optical gain/circum-circle model/peak signal-to-noise ratio引用本文复制引用
张腾飞,杨晶,侯岩雪,王伟伟,赵巍,张景园,崔大复,彭钦军,许祖彦..基于光参量变频与放大的高灵敏红外成像技术∗[J].物理学报,2016,(1):014209-1-014209-6,6.基金项目
燕山大学青年教师自主研究计划(批准号:13LGB031)资助的课题.* Project supported by the Young Instructor Self-Topic Research Program of Yanshan University, China (Grant No.13LGB031) （批准号:13LGB031）
