Abstract
Quantum optical coherence tomography (QOCT) makes use of an entangled twin-photon light source to carry out axial optical sectioning. We have probed the longitudinal structure of a sample comprising multiple surfaces in a dispersion-cancelled manner while simultaneously measuring the group-velocity dispersion of the interstitial media between the reflecting surfaces. The results of the QOCT experiments are compared with those obtained from conventional optical coherence tomography (OCT).
Highlights
Optical coherence tomography (OCT), a technique for carrying out axial sectioning of a specimen, has come into wide use [1]–[6]
A particular merit of quantum optical coherence tomography (QOCT) is that it is inherently immune to group velocity dispersion (GVD) of the medium by virtue of the frequency entanglement associated with the twin-photon pairs [9]–[12]
To demonstrate the dispersion-cancellation capability of QOCT, as well as the ability to measure GVD coefficients, we carry out a second QOCT/OCT experiment with a highly dispersive medium: a 12-mm-thick window of ZnSe placed between the two fused-silica windows
Summary
Optical coherence tomography (OCT), a technique for carrying out axial sectioning of a specimen, has come into wide use [1]–[6]. A particular merit of quantum optical coherence tomography (QOCT) is that it is inherently immune to group velocity dispersion (GVD) of the medium by virtue of the frequency entanglement associated with the twin-photon pairs [9]–[12]. QOCT permits us to directly determine the GVD coefficients of the interstitial media between the reflecting surfaces of the sample. The features in the first class carry the information that is most often sought in OCT: the depth and reflectance of the surfaces that constitute the sample. The title of this paper is understood as follows: QOCT provides two classes of information, a dispersion-cancelled tomograph and a dispersion-sensitive determination of the GVD coefficients of the various media that comprise the sample. The GVD coefficient of ZnSe is simultaneously determined to be β ≈ 4.0 ± 0.8 × 10−25s2 m−1
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