Seed source for plasma compression in the long wavelength infrared

Two color laser pulses are used to form an air plasma and generate broadband infrared radiation suitable as a seed for backward Raman amplification of CO2 laser pulses. Broadband radiation in the atmospheric window from 8-14 microns is observed. The infrared radiation is characterized using a long w...

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Bibliographic Details
Published in:Physics of plasmas 2021-03, Vol.28 (3)
Main Authors: Gordon, D. F., Grugan, P., Kupfer, R., Chen, Y. -H., Ting, A., Mamonau, A., Johnson, L. A., Babzien, M.
Format: Article
Language:English
Subjects:
PARTICLE ACCELERATORS
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Summary:Two color laser pulses are used to form an air plasma and generate broadband infrared radiation suitable as a seed for backward Raman amplification of CO2 laser pulses. Broadband radiation in the atmospheric window from 8-14 microns is observed. The infrared radiation is characterized using a long wavelength grating spectrometer specially designed to accept an ionizing laser filament at its input plane. The LWIR yield is greatly enhanced by chirping the drive pulse. Unidirectional pulse propagation simulations suggest that this is due in part to the dependence of the nonlinear refractive index on the pulse
ISSN:1070-664X
1089-7674