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Related Experiment Video

Updated: Jun 17, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Frequency comb swept lasers.

Tsung-Han Tsai1, Chao Zhou, Desmond C Adler

  • 1Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Optics Express
|December 10, 2009
PubMed
Summary
This summary is machine-generated.

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Frequency comb (FC) lasers offer enhanced sensitivity and range for optical coherence tomography (OCT). These lasers enable precise measurements with minimal signal loss, improving OCT imaging capabilities.

Area of Science:

  • Photonics
  • Optical Engineering
  • Biomedical Imaging

Background:

  • Optical coherence tomography (OCT) is a crucial imaging modality.
  • Conventional swept-source and Fourier domain mode-locked (FDML) lasers face limitations in sensitivity roll-off and measurement range.
  • Frequency comb (FC) technology offers potential for enhanced laser performance.

Purpose of the Study:

  • To demonstrate frequency comb swept lasers and FC-FDML lasers for OCT applications.
  • To evaluate the performance of FC lasers in terms of sweep rate, tuning range, output power, and sensitivity.
  • To explore the self-clocking capabilities of FC lasers for OCT signal processing.

Main Methods:

  • Development of fiber-based FC swept lasers operating at 1kHz and 120kHz sweep rates.

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Related Experiment Videos

Last Updated: Jun 17, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

  • Utilizing a 25GHz free spectral range frequency comb filter for precise frequency stepping.
  • Characterization of laser performance including tuning range (135nm centered at 1310nm), output power (50mW), and sensitivity roll-off.
  • Comparison with conventional swept source and FDML lasers.

    • Main Results:

    • FC swept lasers achieve a significantly reduced sensitivity roll-off of approximately -1.2dB over 3mm, compared to -10dB and -5dB for conventional lasers.
    • The lasers generate equally spaced frequency steps (linear in k-space).
    • FC laser output enables self-clocking of OCT interference signal sampling for direct FFT without recalibration.

    Conclusions:

    • FC swept lasers and FC-FDML lasers represent a significant advancement for OCT.
    • These lasers provide superior sensitivity and extended measurement ranges.
    • The self-clocking capability simplifies OCT data processing and enhances measurement accuracy.