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Updated: Jun 6, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

Ultrafast pulse compression by semiconductor two-photon gain.

Amir Nevet¹, Alex Hayat, Meir Orenstein

¹Department of Electrical Engineering, Technion, Haifa 32000, Israel. nevet@tx.technion.ac.il

|December 3, 2010

Summary

This summary is machine-generated.

Researchers compressed femtosecond pulses using two-photon gain in an aluminum gallium arsenide (AlGaAs) waveguide. Pulse width was dynamically controlled by adjusting current injection levels, matching theoretical predictions.

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Last Updated: Jun 6, 2026

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Published on: July 12, 2017

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Published on: February 4, 2017

Area of Science:

Optoelectronics
Nonlinear optics
Semiconductor devices

Background:

Femtosecond pulse generation and manipulation are crucial for advanced optical applications.
Semiconductor waveguides offer compact platforms for integrated photonic devices.

Purpose of the Study:

To demonstrate femtosecond pulse compression using two-photon gain in an electrically driven AlGaAs waveguide.
To achieve dynamic control over pulse width through electrical means.

Main Methods:

Experimental demonstration of pulse compression in a compact AlGaAs waveguide.
Utilizing two-photon gain for pulse shortening.
Varying current injection levels to control pulse width.
Measuring pulse width using a high-sensitivity intensity autocorrelator based on two-photon absorption in a GaAs photomultiplier tube.

Main Results:

Achieved compression of femtosecond-scale optical pulses.
Demonstrated dynamic control of pulse width from 240 fs to 140 fs.
Experimental results showed good agreement with theoretical calculations.

Conclusions:

Electrically driven AlGaAs waveguides are effective for femtosecond pulse compression.
Two-photon gain provides a viable mechanism for dynamic pulse width control.
The developed method offers a compact and controllable solution for ultrafast optics.