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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Pulse evolution in a broad-bandwidth Ti:sapphire laser.

J Zhou, G Taft, C P Huang

|October 22, 2009

Summary

This summary is machine-generated.

Researchers generated sub-10-femtosecond pulses from a Ti:sapphire laser by optimizing dispersion. Shorter pulse durations are limited by fourth-order dispersion, suggesting further reductions are possible with improved optics.

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Area of Science:

Ultrafast optics
Laser physics
Nonlinear optics

Background:

Mode-locked lasers are crucial for generating ultrashort optical pulses.
Ti:sapphire lasers are widely used for generating femtosecond pulses due to their broad gain bandwidth.
Dispersion management is critical for achieving the shortest possible pulse durations.

Purpose of the Study:

To demonstrate the generation of sub-10-femtosecond (fs) pulses from a self-mode-locked Ti:sapphire laser.
To investigate the factors limiting pulse duration, specifically higher-order dispersion.
To characterize the intracavity pulse properties (duration and chirp) at different positions within the laser cavity.

Main Methods:

Operating the Ti:sapphire laser near the zero second- and third-order dispersion points.
Performing numerical simulations to model pulse evolution and identify limiting dispersion orders.
Inserting a pellicle into the laser cavity at various positions to measure intracavity pulse characteristics.

Main Results:

Generation of optical pulses with durations under 10 fs was achieved.
Numerical simulations identified fourth-order dispersion as the primary limitation for achieving shorter pulses.
Intracavity measurements revealed that the shortest pulses occur near the center of the laser crystal in one propagation direction.
In the opposite propagation direction, pulses were found to be positively chirped and significantly longer.

Conclusions:

Optimizing dispersion, particularly minimizing second- and third-order terms, is key to generating sub-10-fs pulses in Ti:sapphire lasers.
Fourth-order dispersion presents a fundamental limit to pulse compression in this system, necessitating advanced dispersion control for further improvements.
Spatial and directional variations in intracavity pulse duration and chirp were observed, highlighting the importance of precise alignment and understanding pulse propagation within the laser medium.