Two-photon laser scanning fluorescence microscopy using photonic crystal fiber

Area of Science:

• Optics and Photonics
• Biomedical Imaging
• Materials Science

Background:

• Two-photon laser scanning fluorescence microscopy (2PLSM) is a vital bioimaging technique.
• Incumbent 2PLSM systems face limitations in fluorescence yield and pulse duration.
• Advancements are needed to improve signal detection and spatial resolution.

Purpose of the Study:

• To introduce a novel modular pulse compression system for 2PLSM.
• To enhance the fluorescence yield compared to existing commercial systems.
• To achieve ultrashort infrared (IR) laser pulses at the sample.

Main Methods:

• Development of a modular pulse compression system utilizing photonic crystal fibers (PCFs).
• Integration of the PCF-based system with a two-photon laser scanning fluorescence microscope.
• Characterization of the system's performance, focusing on fluorescence yield and pulse duration.

Main Results:

• The PCF-based system demonstrated a greater than sevenfold increase in fluorescence yield.
• Achieved ultrashort IR pulses with durations less than 35 femtoseconds (fs) reaching the sample.
• The modular design offers flexibility and ease of integration.

Conclusions:

• The developed PCF pulse compression system offers a significant improvement over conventional 2PLSM.
• This technology enhances imaging sensitivity and potentially resolution.
• The system represents a powerful tool for advanced fluorescence microscopy applications.