Femtosecond diode-based time lens laser for multiphoton microscopy

Area of Science:

• Biomedical optics
• Microscopy technology
• Laser physics

Background:

• Two-photon microscopy (TPM) is crucial for deep tissue imaging.
• Existing laser sources can be bulky, inefficient, or lack sufficient peak power.
• Advancements in laser technology are needed to improve accessibility and performance in TPM.

Purpose of the Study:

• To demonstrate a novel near-infrared, femtosecond, diode laser source.
• To achieve kilowatt (kW) peak power for enhanced two-photon microscopy.
• To enable deeper and more efficient imaging of biological tissues.

Main Methods:

• Utilized a diode laser-based system emitting at 976 nm.
• Generated sub-picosecond (sub-ps) pulses at a 10 MHz repetition rate.
• Integrated the laser source with a laser-scanning microscope.

Main Results:

• Achieved kW class peak powers suitable for deep tissue imaging.
• Successfully imaged to a depth of 900 µm in fixed mouse brain tissue (PLP-eGFP labeled).
• Demonstrated the system's capability for high-resolution deep tissue visualization.

Conclusions:

• The developed diode laser source offers a significant advancement for two-photon microscopy.
• This technology leads to more efficient, compact, and accessible laser systems for biomedical imaging.
• The system's performance supports improved diagnostic and research capabilities in deep tissue imaging.