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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
Published on: November 22, 2019
Selective two-photon microscopy with shaped femtosecond pulses
Optics Express
|May 26, 2009
Summary
Researchers demonstrate selective two-photon excitation of fluorescent probes using phase-modulated ultrashort laser pulses. This multiphoton intrapulse interference (MII) method enhances molecular imaging contrast in diverse chemical environments.
Area of Science:
- Optics and Photonics
- Chemical Physics
- Microscopy
Background:
- Two-photon excitation microscopy offers enhanced resolution and reduced photobleaching.
- Controlling excitation selectivity is crucial for imaging complex biological and chemical systems.
- Multiphoton intrapulse interference (MII) provides a mechanism for spectral shaping of ultrashort pulses.
Purpose of the Study:
- To demonstrate selective two-photon excitation of fluorescent probes using phase-only modulated ultrashort laser pulses.
- To design spectral phases for maximum excitation contrast in different molecular and micro-chemical environments.
- To apply the MII method for advanced multiphoton microscopy.
Main Methods:
- Utilizing phase-only modulation of 15-fs ultrashort laser pulses.
- Applying principles of multiphoton intrapulse interference (MII) for spectral phase design.
- Employing a multiphoton microscope for imaging.
Main Results:
- Achieved selective two-photon excitation of fluorescent probe molecules.
- Demonstrated control over excitation contrast by designing spectral phases.
- Presented images from various samples acquired using the multiphoton microscope.
Conclusions:
- Phase-only modulated ultrashort pulses enable selective excitation for enhanced multiphoton microscopy.
- The MII method allows precise control over spectral components contributing to two-photon absorption.
- This technique is valuable for imaging diverse samples with improved contrast.
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