Stationary low-coherence light-imaging and spectroscopy using a CCD camera

Alexander R. Knuettel; Joseph M. Schmitt; M. Shay; Jay R. Knutson

doi:10.1117/12.175998

19 May 1994 Stationary low-coherence light imaging and spectroscopy using a CCD camera

Alexander R. Knuettel, Joseph M. Schmitt, M. Shay, Jay R. Knutson

Proceedings Volume 2135, Advances in Laser and Light Spectroscopy to Diagnose Cancer and Other Diseases; (1994) https://doi.org/10.1117/12.175998
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We describe a new optical low-coherence reflectometer (interferometer) for depth profiling and lateral scanning without moving parts which can also be employed as a stationary FT-IR spectrometer. The reflectometer covers a range of 0.45 mm and 1 mm in the depth and lateral dimensions, respectively. The entire depth range is recorded simultaneously in one scan using a cooled 16-bit CCD camera; the lateral dimension is covered by scanning the probe beam sequentially across the sample with an acousto- optic deflector. The frequency shift generated by this deflector and an additional one placed in the reference arm creates an AC heterodyne signal with a frequency of 2kHz. Since the CCD camera cannot record the AC signal directly, a special readout scheme is employed. Stationary imaging was demonstrated using an artificial phantom. Using the same interferometer configured as a stationary FT-IR spectrometer, we measured the emission spectrum of a LED with a resolution of 0.74 nm at a central wavelength of 820 nm. We discuss the performance of the stationary CCD imaging system and compare it to that of a single-detector system employing moving parts.

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Alexander R. Knuettel, Joseph M. Schmitt, M. Shay, and Jay R. Knutson "Stationary low-coherence light imaging and spectroscopy using a CCD camera", Proc. SPIE 2135, Advances in Laser and Light Spectroscopy to Diagnose Cancer and Other Diseases, (19 May 1994); https://doi.org/10.1117/12.175998

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KEYWORDS

Acousto-optics

Mirrors

Reflectometry

Charge-coupled devices

Spatial frequencies

Spectroscopy

CCD cameras

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