17 September 2014 Holographic frequency resolved optical gating for spatio-temporal characterization of ultrashort optical pulse
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Abstract
We introduce a novel method for characterizing the spatio-temporal evolution of ultrashort optical field by recording the spectral hologram of frequency resolved optical gating (FROG) trace. We show that FROG holography enables the measurement of phase (up to an overall constant) and group delay of the pulse which cannot be measured by conventional FROG method. To illustrate our method, we perform numerical simulation to generate holographic collinear FROG (cFROG) trace of a chirped optical pulse and retrieve its complex profile at multiple locations as it propagates through a hypothetical dispersive medium. Further, we experimentally demonstrate our method by retrieving a 67 fs pulse at three axial locations in the vicinity of focus of an objective lens and compute its group delay.
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Nikhil Mehta, Chuan Yang, Yong Xu, Zhiwen Liu, "Holographic frequency resolved optical gating for spatio-temporal characterization of ultrashort optical pulse", Proc. SPIE 9198, Ultrafast Nonlinear Imaging and Spectroscopy II, 91980E (17 September 2014); doi: 10.1117/12.2062516; https://doi.org/10.1117/12.2062516
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