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Related Experiment Videos

Second harmonic FEL oscillation.

G R Neil1, S V Benson, G Biallas

  • 1Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA. neil@jlab.org

Physical Review Letters
|August 11, 2001
PubMed
Summary
This summary is machine-generated.

Researchers achieved second harmonic lasing in the infrared using a free electron laser, overcoming theoretical limitations. This breakthrough produced high-power infrared light, demonstrating a novel application of free electron laser technology.

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Area of Science:

  • Physics
  • Laser Technology
  • Quantum Optics

Background:

  • Second harmonic generation is typically forbidden for on-axis plane waves in free electron lasers.
  • Electron beam alignment with a wiggler normally results in zero gain for plane waves.

Purpose of the Study:

  • To achieve and measure second harmonic oscillation in the infrared region using a free electron laser.
  • To investigate the conditions under which second harmonic lasing can occur despite theoretical restrictions.

Main Methods:

  • Utilized a free electron laser (FEL) system.
  • Employed a wiggler with specific electron beam alignment.
  • Measured infrared output power, bandwidth, and lasing mode.

Main Results:

  • Successfully produced and measured second harmonic oscillation in the infrared.
  • Achieved lasing at pulse rates up to 74.85 MHz.
  • Generated over 4.5 W average and 40 kW peak infrared power at 2925 nm with a 40 nm FWHM bandwidth.
  • Observed preferential lasing in the TEM01 mode, consistent with theoretical predictions.

Conclusions:

  • Demonstrated that second harmonic lasing in the infrared is achievable with free electron lasers.
  • Showcased the potential of transverse mode antisymmetry to enable lasing under specific conditions.
  • Established a new method for generating high-power infrared radiation using FELs.