Long wave infrared (LWIR) radiation (7-14 μm) allows illumination-less imaging, and spectroscopic chemical identification. Infrared imaging is ubiquitous in defense thermography, airborne and atmospheric sensing, fault detection, and medical testing. Visible speckle imaging can successfully image through complex scattering media. We describe a novel broadband LWIR speckle imaging-based wavefront sensor, utilizing a thin diffuser with an uncooled microbolometric camera. Due to the thin diffuser, local phase gradients produce speckle deformations which are estimated by a rapid image registration algorithm to generate a phase gradient map, whose 2-D integration yields the reconstructed wavefront. We demonstrate LWIR wavefront reconstruction using our setup in infrared optical samples, with future applications for LWIR imaging through visually non-transparent materials.
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