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Updated: Jun 28, 2026
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Pulse-to-pulse coherent beat note generated by a passively Q-switched two-frequency laser
1Equipe Physique des Lasers, Institut de Physique de Rennes, UMR 6251 Université de Rennes 1-CNRS, Rennes Cedex, France. brunel@univ-rennes1.fr
Optics Letters
|November 4, 2008
Summary
We achieved pulse-to-pulse coherence for a dual-polarization laser
Area of Science:
- Optics and Photonics
- Laser Physics
Background:
- Passively Q-switched lasers often lack pulse-to-pulse coherence.
- Optical phase memory loss between pulses limits applications.
Purpose of the Study:
- To demonstrate pulse-to-pulse coherence in a dual-polarization laser.
- To achieve phase-locking of the beat note against an external reference.
Main Methods:
- Utilized a dual-polarization passively Q-switched Nd:YAG laser.
- Implemented frequency-shifted, polarization-rotated optical feedback.
- Reinjecting one laser eigenstate into the other.
Main Results:
- Achieved phase-locking of the beat note at the onset of each pulse.
- Circumvented intrinsic optical phase memory loss between pulses.
- Generated a coherent pulsed beat note in the radio-frequency range with subhertz linewidth.
Conclusions:
- Demonstrated a method for generating optically coherent pulsed beat notes.
- The technique enables coherence over thousands of pulses.
- Potential applications in lidar radar systems.
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