Abstract

Infrared (IR) imaging sees a wide range of applications due to its ability to probe molecular vibrations but is limited by detector technology available in this part of the spectrum. Imaging with undetected photons [1] offers an alternative. Using a nonlinear interferometer producing visible-IR photon pairs, transmission and phase information of an object in the IR can be observed by monitoring the interference of visible photons. No IR detection or laser is required. Recently there has been a move towards increasing the technology readiness levels of this approach, considering size, stability, and speed [2-4].

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