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Blood Flow Imaging with Ultrafast Doppler
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Compressed Ultrafast Spectral-Temporal Photography.

Yu Lu1,2, Terence T W Wong3, Feng Chen1

  • 1State Key Laboratory for Manufacturing System Engineering and Key Laboratory of Photonics Technology for Information of Shaanxi Province, School of Electronics & Information Engineering, Xi'an Jiaotong University, 28 Xianning West Road, Xi'an, Shaanxi 710049, China.

Physical Review Letters
|May 31, 2019
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Compressed ultrafast spectral-temporal (CUST) photography achieves 3.85 trillion frames per second, capturing 60 frames to observe light dynamics. This advanced imaging technique offers high spectral resolution for transient phenomena.

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Area of Science:

  • Optical Imaging
  • Ultrafast Spectroscopy
  • Nonlinear Optics

Background:

  • Observing transient physical and chemical processes requires high frame rate and spectral resolution optical imaging.
  • Existing ultrafast imaging methods are limited by low frame numbers at trillion Hz frame rates.
  • Key phenomena like photon propagation and femtosecond chemical reactions demand advanced imaging capabilities.

Purpose of the Study:

  • To introduce a novel compressed ultrafast spectral-temporal (CUST) photographic technique.
  • To enable simultaneous acquisition of high frame rate, high frame number, and high spectral resolution images.
  • To overcome limitations of current ultrafast imaging modalities for complex transient event observation.

Main Methods:

  • Development of a compressed ultrafast spectral-temporal (CUST) photographic technique.
  • Utilizing spectral-temporal coupling for multi-frame acquisition within a single laser exposure.
  • Demonstration of CUST photography's capability to record light propagation and nonlinear optical effects.

Main Results:

  • Achieved an ultrahigh frame rate of 3.85 trillion frames per second.
  • Successfully recorded 60 frames, capturing light propagation, reflection, and self-focusing in nonlinear media over 30 ps.
  • Demonstrated subnanometer spectral resolution for ultrafast spectral imaging.

Conclusions:

  • CUST photography provides a powerful new tool for observing transient phenomena with unprecedented temporal and spectral detail.
  • The technique offers potential for further increasing the frame number beyond hundreds of frames.
  • CUST photography enables high-fidelity recording of complex ultrafast events, advancing fields like nonlinear optics and chemical dynamics.