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Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
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Ultra-high-speed phase-sensitive optical coherence reflectometer with a stretched pulse supercontinuum source.

Hoseong Song1, Seung Bum Cho, Dong Uk Kim

  • 1School of Information and Mechatronics, Gwangju Institute of Science and Technology, 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, South Korea.

Applied Optics
|July 21, 2011
PubMed
Summary

We developed an ultra-high-speed phase-sensitive optical coherence reflectometer using a stretched pulse supercontinuum source. This technology achieves 2.5 MHz measurement speeds for precise surface profiling and motion monitoring.

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Area of Science:

  • Optical Engineering
  • Metrology
  • Spectroscopy

Background:

  • Optical coherence reflectometry (OCR) is crucial for high-resolution imaging.
  • Existing OCR systems face limitations in speed and sensitivity.
  • Developing faster, more sensitive OCR techniques is essential for advanced applications.

Purpose of the Study:

  • To demonstrate an ultra-high-speed phase-sensitive time-wavelength-domain optical coherence reflectometer.
  • To leverage a stretched pulse supercontinuum source for enhanced performance.
  • To achieve high-speed surface profiling and vibrational motion monitoring.

Main Methods:

  • Utilized a pulsed fiber laser to generate a supercontinuum.
  • Stretched 30 ps pulses to 70 ns using a highly dispersive fiber.
  • Implemented a phase-sensitive reflectometer measuring spectral interferograms of reflected light.
  • Employed the wavelength-time relationship in chirped pulses for rapid spectrum analysis.

Main Results:

  • Achieved ultra-high-speed two-dimensional surface profiling.
  • Demonstrated high-speed single-point monitoring of vibrational motion.
  • Reached a measurement speed of 2.5 MHz for single-point position.
  • Attained position accuracy better than 4.49 nm.

Conclusions:

  • The developed reflectometer offers unprecedented speed for optical coherence measurements.
  • The stretched pulse supercontinuum source enables high-speed, high-accuracy metrology.
  • This technique has significant potential for applications requiring rapid, precise measurements.