George Nicholas, Khare Kedar, Chi Wanli
The Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
Appl Opt. 2008 Feb 1;47(4):A7-12. doi: 10.1364/ao.47.0000a7.
We describe a series of experiments to demonstrate holography at far-infrared wavelengths using an uncooled microbolometer array. Simple interference patterns and Fresnel zone holograms are recorded with a 10 W cw CO(2) laser illumination in a Mach-Zehnder interferometer setup. A sparse-sampling method is used to sample the hologram at a rate dependent on the bandwidth of the object wavefront rather than the carrier frequency. The samples are then used to reconstruct the complex object wavefront in the hologram plane, which is Fresnel backpropagated for image reconstruction. Uncooled microbolometer arrays are most commonly used in passive mode to image the thermal-blackbody radiation. Their technology has matured to include the wavelength range of far-infrared to submillimeter radiation. The use of microbolometers with active illumination for holography, as described in this paper, suggests their interesting future applications.
我们描述了一系列实验，以展示使用非制冷微测辐射热计阵列在远红外波长下的全息术。在马赫-曾德尔干涉仪设置中，用10瓦连续波CO(2)激光照明记录简单的干涉图样和菲涅耳区全息图。采用一种稀疏采样方法，以取决于物波前带宽而非载波频率的速率对全息图进行采样。然后将这些样本用于在全息图平面中重建复物波前，该复物波前经菲涅耳反向传播用于图像重建。非制冷微测辐射热计阵列最常用于被动模式以对热黑体辐射进行成像。其技术已经成熟，涵盖了从远红外到亚毫米辐射的波长范围。如本文所述，将微测辐射热计用于主动照明全息术，表明了它们有趣的未来应用前景。
