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Synchronous digitization for high dynamic range lock-in amplification in beam-scanning microscopy.

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Area of Science:

  • Microscopy and Imaging Technologies
  • Optical Physics
  • Signal Processing

Background:

  • Conventional lock-in amplification (LIA) faces limitations in signal-to-noise (S/N) and dynamic range for pulsed laser microscopy.
  • Synchronous digitization (SD) is an emerging technique for enhancing signal acquisition.

Purpose of the Study:

  • To evaluate the performance of digital lock-in amplification with synchronous digitization (SD-LIA) in beam-scanning microscopy.
  • To compare SD-LIA against conventional LIA for pulsed laser applications.

Main Methods:

  • Implemented SD-LIA in homodyne second harmonic generation (SHG) microscopy with pulsed laser sources.
  • Performed direct comparisons of S/N and dynamic range between SD-LIA and conventional LIA.
  • Utilized rapid beam scanning instrumentation for video-rate acquisition.

Main Results:

  • SD-LIA demonstrated significant S/N and linear dynamic range advantages over conventional LIA.
  • Observed S/N enhancements in SD-LIA were consistent with theoretical predictions.
  • SD-LIA showed superior performance in low light intensity regimes due to a seamless transition between photon counting and signal averaging.
  • Rapid scanning minimized photo-induced sample damage, enabling higher laser power.

Conclusions:

  • SD-LIA offers substantial improvements for pulsed laser microscopy, particularly in enhancing S/N and dynamic range.
  • The technique is effective in low light conditions and allows for increased signal acquisition through higher laser power without damaging the sample.