Hybrid Mid-IR OCT System for Imaging and Spectroscopy Using New High Power Low-Coherence Quantum Cascade Superluminescent Emitters

Varnell, Deborah; Mei, Zhigang; Aung, Nyan; Musse, Ahmed; Lee, Samantha; Gmachl, Claire F.

doi:10.1364/cleo_at.2015.jw2a.85

Cited by 1 publication

(4 citation statements)

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“…The visibility of the interference fringes observed at the second and third positions is less than the visibility of the fringes at the first position due to the loss of idler photons, see equation (6).…”

Section: Measurements Of Positions Of Reflective Layersmentioning

confidence: 98%

“…The absorption and scattering coefficients for the sample are negligible at the probing wavelengths. Assuming a non-absorptive sample with N=2 surfaces, the visibility ratios are given by (see equation (5)): The visibility of the interference fringes observed at the second and third positions is less than the visibility of the fringes at the first position due to the loss of idler photons, see equation (6). figure 4(a), mainly due to imperfections of optical components in the IR arm.…”

Section: Measurements Of Positions Of Reflective Layersmentioning

confidence: 99%

“…More recently high power low-coherence quantum cascade superluminescent emitters have been introduced [6]. In these systems, both the light source and the photodetector require cryogenic cooling.…”

Section: Introductionmentioning

confidence: 99%

“…Reported mid-IR OCT systems use multiregion quantum cascade lasers and mid-IR photodetectors [5]. More recently high power low-coherence quantum cascade superluminescent emitters have been introduced [6]. In these systems, both the light source and the photodetector require cryogenic cooling.…”

Section: Introductionmentioning

confidence: 99%

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Tunable optical coherence tomography in the infrared range using visible photons

Paterova

Yang

et al. 2018

Quantum Sci. Technol.

100

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Optical coherence tomography (OCT) is an appealing technique for bio-imaging, medicine, and material analysis. For many applications, OCT in mid-and far-infrared (IR) leads to significantly more accurate results. Reported mid-IR OCT systems require light sources and photodetectors which operate in mid-IR range. These devices are expensive and need cryogenic cooling. Here, we report a proof-of-concept demonstration of a wavelength tunable IR OCT technique with detection of only visible range photons. Our method is based on the nonlinear interference of frequency correlated photon pairs. The nonlinear crystal, introduced in the Michelson-type interferometer, generates photon pairs with one photon in the visible and another in the IR range. The intensity of detected visible photons depends on the phase and loss of IR photons, which interact with the sample under study. This enables us to characterize sample properties and perform imaging in the IR range by detecting visible photons. The technique possesses broad wavelength tunability and yields a fair axial and lateral resolution, which can be tailored to the specific application. The work contributes to the development of versatile 3D imaging and material characterization systems working in a broad range of IR wavelengths, which do not require the use of IR-range light sources and photodetectors.

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Section: Measurements Of Positions Of Reflective Layersmentioning

confidence: 98%

Section: Measurements Of Positions Of Reflective Layersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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