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Related Concept Videos

Bandpass Sampling01:17

Bandpass Sampling

In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Pulse generation without gain-bandwidth limitation in a laser with self-similar evolution.

A Chong1, H Liu, B Nie

  • 1Department of Applied Physics, Cornell University, Ithaca, New York 14853, USA.

Optics Express
|June 21, 2012
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Summary

This study demonstrates a fiber laser that overcomes gain-bandwidth limitations for ultrashort pulse generation. By exploiting self-similar pulse evolution, lasers can achieve broader spectra and shorter pulse durations.

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Area of Science:

  • Laser Physics
  • Nonlinear Optics
  • Fiber Optics

Background:

  • Mode-locking techniques typically limit ultrashort laser pulse bandwidth by the gain medium's spectrum.
  • Self-similar pulse evolution in lasers allows tolerance of spectral breathing, stabilized by nonlinear attraction to parabolic pulses.

Purpose of the Study:

  • To eliminate the gain-bandwidth limitation on ultrashort pulse duration in fiber lasers.
  • To leverage self-similar pulse evolution for broader spectral generation and shorter pulse outputs.

Main Methods:

  • Utilizing passive nonlinear propagation in a normal-dispersion fiber laser.
  • Exploiting the nonlinear attraction to parabolic self-similar pulses for spectral stabilization.
  • Dechirping the generated broad spectra to achieve ultrashort pulse durations.

Main Results:

  • Achieved broad spectral generation of approximately 200 nm.
  • Successfully generated ultrashort pulses with durations of approximately 20 femtoseconds (fs).
  • Demonstrated the elimination of gain-bandwidth limitations for pulse duration.

Conclusions:

  • Self-similar pulse evolution in fiber lasers can overcome gain-bandwidth limitations.
  • This approach enables the generation of ultrashort pulses with unprecedented spectral bandwidths and durations.
  • Passive nonlinear propagation in normal-dispersion lasers is key to achieving these results.