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Two-photon microperimetry with picosecond pulses.

Marcin J Marzejon1,2,3, Łukasz Kornaszewski1,3, Jakub Bogusławski1,3

  • 1Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warszawa, Poland.

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Summary

Two-photon vision, enabled by two-photon absorption, can be achieved using picosecond lasers. Shorter pulse durations require less optical power, confirming their potential for cost-effective microperimetry devices.

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Area of Science:

  • Ophthalmology
  • Biophysics
  • Laser Technology

Background:

  • Two-photon vision involves perceiving near-infrared radiation as visible light through nonlinear two-photon absorption by visual pigments.
  • Understanding the impact of laser parameters like pulse duration and repetition rate is crucial for developing new visual testing technologies.

Purpose of the Study:

  • To investigate the influence of pulse duration and repetition rate of short-pulsed lasers on the visual threshold for two-photon vision.
  • To compare the efficacy of a fiber laser versus a solid-state laser in generating two-photon vision phenomena.

Main Methods:

  • Generated two-photon sensitivity maps of the retina in subjects with normal vision.
  • Utilized a cost-effective fiber laser (1028.4 nm, 12.2 ps, 19.17 MHz) and a solid-state laser (1043.3 nm, 0.253 ps, 62.65 MHz).
  • Measured and compared the average optical power and sensitivity required for two-photon vision.

Main Results:

  • The fiber laser required 4 times greater average optical power for two-photon vision compared to the solid-state laser, consistent with two-photon absorption principles.
  • Mean sensitivity was 5.9 ± 2.8 dB lower with the fiber laser than the solid-state laser.
  • Sensitivity remained 17 dB below the safety limit, indicating the viability of picosecond light sources.

Conclusions:

  • Picosecond laser sources are effective for inducing two-photon vision and can be safely applied in microperimetry.
  • This research paves the way for significantly reducing the cost and complexity of future clinical visual assessment devices.