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Related Concept Videos

Continuous -time Fourier Transform01:11

Continuous -time Fourier Transform

The Fourier series is instrumental in representing periodic functions, offering a powerful method to decompose such functions into a sum of sinusoids. This technique, however, necessitates modification when applied to nonperiodic functions. Consider a pulse-train waveform consisting of a series of rectangular pulses. When these pulses have a finite period, they can be accurately represented by a Fourier series. Yet, as the period approaches infinity, resulting in a single, isolated pulse, the...
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Fast Fourier Transform

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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
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Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

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Imaging Biological Samples with Optical Microscopy

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Related Experiment Video

Updated: Jun 22, 2026

Simultaneous Brightfield, Fluorescence, and Optical Coherence Tomographic Imaging of Contracting Cardiac Trabeculae Ex Vivo
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Simultaneous Brightfield, Fluorescence, and Optical Coherence Tomographic Imaging of Contracting Cardiac Trabeculae Ex Vivo

Published on: October 2, 2021

Full-field time-encoded frequency-domain optical coherence tomography.

Boris Povazay, Angelika Unterhuber, Boris Hermann

    Optics Express
    |June 17, 2009
    PubMed
    Summary

    This study presents a novel optical coherence tomography (OCT) method for high-resolution 3D imaging without mechanical scanning. The technique achieves detailed surface profiling and volumetric imaging, offering faster and more stable microscopic sample analysis.

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    Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
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    Simultaneous Brightfield, Fluorescence, and Optical Coherence Tomographic Imaging of Contracting Cardiac Trabeculae Ex Vivo
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    Published on: October 2, 2021

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    Published on: January 22, 2013

    Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
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    Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

    Published on: January 15, 2013

    Area of Science:

    • Biomedical Optics
    • Microscopy
    • Optical Imaging

    Background:

    • Traditional optical coherence tomography (OCT) often relies on mechanical scanning, limiting imaging speed and stability.
    • Achieving high axial and transverse resolution in volumetric imaging requires advanced techniques.
    • Reducing light exposure to delicate biological samples is crucial for in vivo studies.

    Purpose of the Study:

    • To introduce a novel time-encoded frequency domain optical coherence tomography (OCT) system for ultrahigh-resolution surface profiling and volumetric imaging.
    • To demonstrate OCT imaging without mechanical scanning elements, enhancing stability and speed.
    • To evaluate the system's performance on test surfaces and biological specimens.

    Main Methods:

    • Utilized a frequency-tuned, broad-bandwidth titanium sapphire laser interfaced with an optical microscope.
    • Integrated an interferometric imaging head with a 640 x 480 pixel CMOS camera optimized for 800 nm wavelength.
    • Acquired volumetric data (~1.3 x 1 x 0.2 mm^3) with ~3 µm axial and ~4 µm transverse resolution using a single wavelength scan over a >100 nm bandwidth.

    Main Results:

    • Achieved ultrahigh axial resolution surface profiling and volumetric optical imaging.
    • Demonstrated topography and tomography with a high signal-to-noise ratio of 83 dB.
    • Acquired sample volume data with precise axial and transverse resolution using a mechanically stable, scanning-free OCT system.

    Conclusions:

    • The developed time-encoded frequency domain OCT technique enables high-speed, 3D imaging without mechanical components.
    • This approach offers enhanced stability and reduced light intensity on the sample.
    • The system's performance on test surfaces and biological specimens highlights its potential for advanced microscopic analysis.