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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 20,
  • Issue 10,
  • pp. 100003-
  • (2022)

High spatial-resolution biological tissue imaging in the second near-infrared region via optical parametric amplification pumped by an ultrafast vortex pulse [Invited]

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Abstract

Applying an ultrafast vortex laser as the pump, optical parametric amplification can be used for spiral phase-contrast imaging with high gain, wide spatial bandwidth, and high imaging contrast. Our experiments show that this design has realized the 1064 nm spiral phase-contrast idler imaging of biological tissues (frog egg cells and onion epidermis) with a spatial resolution at several microns level and a superior imaging contrast to both the traditional bright- or dark-field imaging under a weak illumination of 7 nW/cm2. This work provides a powerful way for biological tissue imaging in the second near-infrared region.

© 2022 Chinese Laser Press

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