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Updated: Jul 16, 2025
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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
Published on: November 22, 2019
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Sub-wavelength effects in a free electron laser oscillator.
Optics Express
|September 15, 2023
Summary
This study introduces sub-wavelength scale simulations for cavity-based free electron lasers (FELs), revealing novel harmonic lasing. This advancement opens new avenues for exploring advanced FEL operational modes.
Area of Science:
- Physics
- Quantum Optics
- Accelerator Physics
Background:
- Traditional cavity-based free electron laser (FEL) simulations average optical fields over integer wavelengths.
- This averaging limits the study of sub-wavelength phenomena in FELs.
Purpose of the Study:
- To develop and apply unaveraged simulation codes for sub-wavelength scale modeling of cavity-based FELs.
- To investigate novel operational modes and effects previously inaccessible to simulation.
Main Methods:
- Combined two unaveraged simulation codes, OPC and Puffin.
- Modeled a cavity FEL operating in the mid-infrared at the sub-wavelength scale.
Main Results:
- Enabled simulation of effects like coherent spontaneous emission and sub-wavelength cavity length detuning.
- Demonstrated preferential lasing at the third harmonic of the fundamental FEL wavelength for small sub-wavelength cavity detunings.
Conclusions:
- Sub-wavelength scale simulations reveal new FEL behaviors, including harmonic generation.
- This approach opens cavity-based FELs to the investigation of novel and potentially useful operational modes.
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