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.
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机译：我们描述了一系列实验，以演示使用未冷却的微辐射热计阵列在远红外波长处的全息照相。在Mach-Zehnder干涉仪设置中，使用10 W cw CO_（2）激光照射记录简单的干涉图样和菲涅耳区全息图。稀疏采样方法用于对全息图进行采样，采样率取决于对象波前的带宽而不是载波频率。然后，将样本用于在全息图平面中重构复杂的对象波前，将其进行菲涅耳反向传播以进行图像重构。未冷却的微辐射热计阵列最常用于被动模式，以对黑体辐射进行成像。他们的技术已经成熟，可以包括远红外到亚毫米辐射的波长范围。如本文所述，将具有主动照明功能的微辐射热计用于全息照相，表明了它们在未来的有趣应用。
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