Phase and amplitude reconstruction from 2D frequency domain interferogram for mid-infrared short optical pulse

Jing Su; Earl D. Shaw

doi:10.1117/12.352671

19 July 1999 Phase and amplitude reconstruction from 2D frequency domain interferogram for mid-infrared short optical pulse

Jing Su, Earl D. Shaw

Author Affiliations +

Proceedings Volume 3614, Free-Electron Laser Challenges II; (1999) https://doi.org/10.1117/12.352671
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

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.

Citation Download Citation

Jing Su and Earl D. Shaw "Phase and amplitude reconstruction from 2D frequency domain interferogram for mid-infrared short optical pulse", Proc. SPIE 3614, Free-Electron Laser Challenges II, (19 July 1999); https://doi.org/10.1117/12.352671

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