A modified-SPIDER (spectral phase interferometry for direct electric-field reconstruction) technique where external powerful optical pulses are employed as a light source of chirped reference pulses for sum-frequency generation is proposed and is demonstrated experimentally. It provides great improvements in sensitivity and signal-to-noise ratio, and will enable a single-shot measurement for a weak pulse, such as 1 nJ/THz-bandwidth. The technique demonstrates high accuracy for determining the delay-time, t, for weak pulse characterization, which greatly affects the group-delay dispersion of the reconstructed spectral phase.
CITATION STYLE
Hirasawa, M., Nakagawa, N., Yamamoto, K., Morita, R., Shigekawa, H., & Yamashita, M. (2002). Sensitivity improvement of spectral phase interferometry for direct electric-field reconstruction for the characterization of low-intensity femtosecond pulses. Applied Physics B: Lasers and Optics, 74(SUPPL.). https://doi.org/10.1007/s00340-002-0891-y
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