Abstract
We utilize a birefringent delay line to perform spatially-resolved Fourier transform spectroscopy at multiple planes around the focus of an ultrashort laser pulse. Combining these measurements at multiple planes with phase-retrieval, i.e. the INSIGHT technique, allows for the determination of the three-dimensional laser field, in both amplitude and phase, lacking only the knowledge of a spatially-uniform spectral phase. We use the device to simultaneously measure two low-order spatio-temporal couplings resulting from a misaligned chromatic lens doublet. Besides being a new implementation of spatio-spectral characterization of ultrashort pulses, this technique allows for more accuracy and stability in spatio-spectral characterization and a push to shorter wavelengths, and may ultimately enable sparse measurements.
Highlights
Spatio-temporal couplings (STCs) and spatio-spectral couplings are generally aberrations on ultrashort laser pulses that lead to the space and time or space and frequency descriptions of the laser field to be inseparable [1]
There are many techniques for spatio-temporal characterization [2,3], which often involve spatio-spectral characterization followed by a spectral phase measurement at a single transverse position, allowing for calculating the spatio-temporal field via the Fourier-transform
We present here a device which is a new implementation of the INSIGHT technique using an interferometer based on a delay line composed of birefringent prisms [5], which is essentially a modified Babinet-Soleil retarder
Summary
Spatio-temporal couplings (STCs) and spatio-spectral couplings are generally aberrations on ultrashort laser pulses that lead to the space and time or space and frequency descriptions of the laser field to be inseparable [1]. An interferometer based on a birefringent delay line has been used for stable two-dimensional Fourier-transform spectroscopy in the infrared [6,7], referred to as the TWINS device (TranslatingWedge-Based Identical Pulses eNcoding System) [8]. Because it has very accurate and stable delay-stepping, TWINS has been extended to two-dimensional spectroscopy in the visible range [9] and demonstrated successful application to hyperspectral imaging ( in the visible range) [10,11], available in a range of industrial devices [12]. In this work we show a first demonstration of this device for measuring common spatio-temporal couplings
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