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针对红外成像制导半实物仿真系统对图像转换器的需求,基于物体吸收能量后温度升高而产生热辐射的原理,设计并制备出一种新型金黑可见光红外图像转换薄膜,建立了薄膜辐射的物理和数学模型,求解了薄膜一维和二维热传导的定解问题,分析了黑体薄膜时间和空间特性,提出了用周期性网格结构黑体薄膜提高转换薄膜的空间分辨率的方案,制备出的转换薄膜达到的技术指标为:薄膜尺寸52mm,像元尺寸140μm×140μm,像元间距29μm,时间常数6ms,空间分辨率6lpmm.
关键词:
金黑
周期性网格结构
薄膜 相似文献
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High efficiency continuous-wave tunable signal output of an intracavity singly resonant optical parametric oscillator based on periodically poled lithium niobate 下载免费PDF全文
In this paper we report on a continuous-wave (CW) intracavity singly
resonant optical parametric oscillator (ICSRO) based on periodically
poled LiNbO3 (PPLN) pumped by a diode-end-pumped CW
Nd:YVO4 laser. Considering the thermal lens effects and
diffraction loss, an optical ballast lens and a near-concentric
cavity are adopted for better operation. Through varying the grating
period and the temperature, the tunable signal output from 1406~nm
to 1513~nm is obtained. At a PPLN grating period of 29~μ m and a
temperature of 413~K, a maximum signal output power of 820~mW at
1500~nm is achieved when the 808~nm pump power is 10.9~W, leading to
an optical-to-optical conversion efficiency of 7.51%. 相似文献
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A new class of transparent glass-ceramics attracted much attention in the past decades[1,2], in which the fluoride nanocrystals doped with rare earth ions were dispersed in an oxide network. The optical proper- ties of rare earth ions in oxyfluoride glass depend on the fluoride nanocrystals, and the mechanical proper- ties depend predominantly on the oxide host. Hence, the oxyfluoride glass-ceramics are promising materials for op- tical amplifiers and laser up-conversion applications[3,4]. Wan… 相似文献
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Optical transmission at 532 nm from nonabsorbing disordered porous silicon dioxide has been studied experimentally. The transmission behaviors can be adjusted by filling the pores with liquids of different refractive indics, which are analyzed based on the theory of diffusion in a weak scattering regime. In our experiment, the transmission coefficient changes from a value less than 1% to one that is greater than 75%, that is, the opaque sample becomes transparent, which means that the transport mean free path of light within the material has been effectively adjusted. In addition, this method is a useful nondestructive method to derive the refractive index of an unknown bulk porous material. 相似文献