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Proceedings Paper

Phase and amplitude reconstruction from 2D frequency domain interferogram for mid-infrared short optical pulse
Author(s): Jing Su; Earl D. Shaw
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Paper Abstract

Ultrashort micropulse characterization of IR-FEL is essential to both FEL development and applications such as terahertz spectroscopy and coherent excitation. Due to wavelength limitation of nonlinear medium, existing techniques of pulse shape measurement are not suitable to the Far IR-FEL of above 100 micron. We present the technique of interferometric cross- correlation in the Fourier space to directly obtain the phase and amplitude information of mid-infrared short optical pulse. By introducing a grating pair as disperser, the interferometric cross-correlation for different spectral components of spectrally expanded pulse is recorded by the 2-D array detector as function of relative delay and spectrum. The relative phases in the pulse spectrum are retrieved from the 2-D interferogram, and the spectrum amplitude is taken from the square root of the power spectrum, the pulse shape can be accurately reconstructed by fast Fourier transform of the complex spectrum field. Without nonlinearity, this technique is very likely to be extended to the Far IR-FEL.

Paper Details

Date Published: 19 July 1999
PDF: 8 pages
Proc. SPIE 3614, Free-Electron Laser Challenges II, (19 July 1999); doi: 10.1117/12.352671
Show Author Affiliations
Jing Su, Rutgers Univ. (United States)
Earl D. Shaw, Rutgers Univ. (United States)

Published in SPIE Proceedings Vol. 3614:
Free-Electron Laser Challenges II
Harold E. Bennett; David H. Dowell, Editor(s)

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