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Femtosecond Ti:Sapphire Oscillator Electro-Optically Cavity Dumped at 50 kHz.

N W Rimington, A Cornea, A J Van Tassle

|March 25, 2008

Summary

Researchers demonstrated cavity dumping a Ti:sapphire laser using a transverse KD*P Pockels cell and sapphire Rochon polarizer. This method achieved high-quality 90-fs pulses with 50 nJ energy at 50 kHz repetition rates.

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Area of Science:

Ultrafast optics
Laser physics
Nonlinear optics

Background:

Mode-locked lasers are crucial for generating ultrashort optical pulses.
Cavity dumping is a technique to extract high-energy pulses from mode-locked lasers.
Ti:sapphire lasers are widely used for generating ultrashort pulses in the visible and near-infrared regions.

Purpose of the Study:

To demonstrate a novel cavity dumping method for a hard-aperture, Kerr-lens mode-locked Ti:sapphire oscillator.
To achieve high-quality, high-energy ultrashort pulses at high repetition rates.

Main Methods:

Utilized a transverse KD*P Pockels cell for electro-optic modulation.
Employed a novel low-loss sapphire Rochon polarizer for pulse extraction.
Integrated these components into a Kerr-lens mode-locked Ti:sapphire laser system.

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Main Results:

Successfully demonstrated cavity dumping of the Ti:sapphire oscillator.
Obtained high-quality pulses with a duration of 90 femtoseconds (fs).
Achieved pulse energies of approximately 50 nanojoules (nJ) at repetition rates up to 50 kilohertz (kHz).

Conclusions:

The demonstrated cavity dumping technique is effective for generating high-energy, ultrashort pulses from Ti:sapphire lasers.
The use of a transverse KD*P Pockels cell and sapphire Rochon polarizer offers a viable solution for high-repetition-rate pulse extraction.
This advancement has implications for various applications requiring high-power ultrashort laser pulses.