Mid-infrared FEL absorption spectra

John A. Kozub; Bibo Feng; William E. Gabella

doi:10.1117/12.461376

1 April 2002 Mid-infrared FEL absorption spectra

John A. Kozub, Bibo Feng, William E. Gabella

Proceedings Volume 4633, Commercial and Biomedical Applications of Ultrafast and Free-Electron Lasers; (2002) https://doi.org/10.1117/12.461376
Event: High-Power Lasers and Applications, 2002, San Jose, California, United States

Abstract

The Vanderbilt Mark III FEL is a tunable source of high- intensity coherent mid-infrared radiation occurring as a train of picosecond pulses spaced 350ps apart. The laser beam is transported to each laboratory under vacuum, but is typically transmitted through some distance of atmosphere before reaching the target. Losses due to absorption by water vapor and CO₂ can be large, and since the bandwidth of the FEL is several percent of the wavelength, the spectrum can be altered by atmospheric absorptions. In order to provide an accurate representation of the laser spectrum delivered to the target, and to investigate any non-linear effects associated with transport of the FEL beam, we have recorded the spectrum of the FEL output using a vacuum spectrometer positioned after measured lengths of atmosphere. The spectrometer is equipped with a linear pyroelectric array which provides the laser spectrum for each pulse. Absorption coefficients are being measured for laboratory air, averaged over the bandwidth of the FEL. The high peak powers of this Fel have induced damage in common infrared-transparent materials; we are also measuring damage thresholds for several materials at various wavelengths.

Citation Download Citation

John A. Kozub, Bibo Feng, and William E. Gabella "Mid-infrared FEL absorption spectra", Proc. SPIE 4633, Commercial and Biomedical Applications of Ultrafast and Free-Electron Lasers, (1 April 2002); https://doi.org/10.1117/12.461376

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