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High repetition rate lasers cause thermal distortions. Using optical choppers with femtosecond z-scan setups eliminates these distortions, enabling precise two-photon absorption measurements and revealing enhanced fluorescence efficiency.

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Area of Science:

  • Optics and Photonics
  • Biophotonics
  • Laser Physics

Background:

  • High repetition rate (HRR) lasers are crucial for multiphoton microscopy, enabling good signal-to-noise ratios at low average powers.
  • HRR lasers can induce thermal distortions in samples due to even minimal single-photon absorption, complicating measurements.
  • Accurate two-photon absorption (TPA) cross-section measurements are vital for understanding chromophore behavior, especially in biologically relevant applications.

Purpose of the Study:

  • To develop a femtosecond z-scan method that eliminates thermal distortions and linear absorption effects.
  • To accurately measure the two-photon absorption (TPA) cross-sections of chromophores.
  • To investigate the impact of "blanking" using an optical chopper on fluorescence efficiency.

Main Methods:

  • Implementation of an optical chopper with a femtosecond z-scan setup utilizing high repetition rate (HRR) lasers.
  • Employing "blanking" to mitigate thermal distortions and linear absorption during TPA measurements.
  • Characterization of TPA cross-sections and fluorescence efficiency in various chromophores.

Main Results:

  • The "blanking" technique effectively eliminated thermal distortions and small linear absorption effects.
  • Precise measurements of two-photon absorption (TPA) cross-sections were achieved.
  • Enhanced fluorescence efficiency was observed in chromophores when using the blanking method.

Conclusions:

  • The demonstrated femtosecond z-scan setup with optical chopper "blanking" provides a robust method for accurate TPA cross-section measurements.
  • This technique is particularly important for chromophores exhibiting spectral differences in regions with minor linear absorption.
  • The "blanking" approach not only improves TPA measurements but also enhances the observed fluorescence efficiency.