Ultra-high-speed phase-sensitive optical coherence reflectometer with a stretched pulse supercontinuum source

Hoseong Song, Seung Bum Cho, Dong Uk Kim, Sungho Jeong, Dug Young Kim

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We demonstrate an ultra-high-speed phase-sensitive time-wavelength-domain optical coherence reflectometer with a stretched pulse supercontinuum source. A pulsed fiber laser operating at 10MHz repetition rate was used to generate a pulsed supercontinuum of 30 ps pulse duration by using a nonlinear optical fiber. The supercontinuum pulses are stretched into 70 ns pulses with a highly dispersive fiber. With this stretched pulse source, we have built a phase-sensitive optical coherence reflectometer that measures the spectral interferogram of reflected light. By using the linear relation between the wavelength and the temporal position in a linearly chirped pulse, ultra-high-speed spectrum measurement can be obtained with this method in the time domain. We have demonstrated ultra-high-speed two-dimensional surface profiling for a standard image target and high-speed single-point monitoring for a fixed point under vibrational motion. It is shown that the measurement speed for the position of a single point can be as fast as 2:5MHz, while the position accuracy can be better than 4:49 nm.

Original languageEnglish
Pages (from-to)4000-4004
Number of pages5
JournalApplied Optics
Volume50
Issue number21
DOIs
Publication statusPublished - 2011 Jul 20

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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