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Researchers developed novel chlorophyll lasers, achieving dual lasing bands and extending emission to the near-infrared. This breakthrough offers potential for biocompatible biosensing and understanding photosynthesis.

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Area of Science:

  • Biophysics
  • Optics
  • Biochemistry

Background:

  • Chlorophylls are vital pigments for photosynthesis and abundant natural compounds.
  • Optofluidic ring resonators with high Q-factors enable sensitive optical investigations.

Purpose of the Study:

  • To investigate the unique characteristics and mechanism of chlorophyll lasers.
  • To explore chlorophyll a (Chla) as a gain medium for novel laser applications.
  • To extend chlorophyll laser emission into the near-infrared (NIR) regime.

Main Methods:

  • Utilized an optofluidic ring resonator with Q-factors exceeding 10^7.
  • Investigated isolated chlorophyll a (Chla) at varying concentrations.
  • Performed concentration-dependent studies and theoretical analysis.
  • Employed Chla as a donor in fluorescence resonance energy transfer (FRET).

Main Results:

  • Observed dual lasing bands (680 nm and 730 nm) in isolated Chla for the first time.
  • Achieved a low lasing threshold (8 μJ mm^-2) at 730 nm for 0.1 mM Chla.
  • Documented lasing competition between the two bands, with 680 nm emission quenching the 730 nm band.
  • Extended laser emission to the NIR region via FRET, with a wavelength shift up to 380 nm.

Conclusions:

  • Elucidated the mechanism governing dual-band laser emission in Chla based on concentration.
  • Demonstrated the potential of Chla for developing biocompatible and biodegradable lasers.
  • Highlighted applications in miniaturized tunable coherent light sources and biosensing.
  • Provided insights into chlorophyll fluorescence and photosynthesis processes.