Measurement of Ultrashort Vector Pulses From Polarization Gates by In-Line, Single-Channel Spectral Interferometry

Alonso, Benjamín González; Sola, Íñigo J.

doi:10.1109/jstqe.2019.2906266

Cited by 21 publications

(15 citation statements)

References 48 publications

(58 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, with the linear polarizer at 45°, we measure an intermediate projection of the x and y components, S xþy ðω; x; yÞ, which encodes their relative phase (see details in Methods). This allows us to accurately retrieve the phase of the y component, and thus, the frequency-dependent and time-dependent polarization 53 . The phase introduced by the birefringent plate is calibrated as described in the Methods Section.…”

Section: Resultsmentioning

confidence: 99%

“…In the last two decades, the problem of measuring spatiotemporal couplings in scalar beams has been tackled with new strategies [43][44][45][46][47] . In parallel, the reconstruction of time-evolving polarization pulses has also been addressed [48][49][50][51][52][53] . However, the necessity for the full spatiotemporal characterization of structured ultrafast laser pulses, which simultaneously includes both spatiotemporal and polarization properties, remained a challenge up to now.…”

mentioning

confidence: 99%

“…In particular we perform the full characterization of infrared femtosecond vector beams generated through an s-waveplate, which allow us: (i) to measure the spatiotemporal quality of RP pulses; (ii) to shape and characterize time-dependent vector beams, structured through the use of polarization gates, and (iii) to monitor the focusing properties of structured vector beams. Our technique is based on two-fold spectral interferometry, both for the spatiotemporal reconstruction through spatially resolved spectral interferometry assisted by a fibre-optic coupler 44 , and for the polarization analysis through in-line bulk interferometry with a thick birefringent plate 53 . The complete knowledge of the vector beam amplitude and phase allows to reconstruct the polarization state of the beam profile (including intensity, polarization azimuth and relative phase between the polarization components) both in the space-frequency and space-time domains.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Complete spatiotemporal and polarization characterization of ultrafast vector beams

et al. 2020

Self Cite

View full text Add to dashboard Cite

The use of structured ultrashort pulses with coupled spatiotemporal properties is emerging as a key tool for ultrafast manipulation. Ultrafast vector beams are opening exciting opportunities in different fields such as microscopy, time-resolved imaging, nonlinear optics, particle acceleration or attosecond science. Here, we implement a technique for the full characterization of structured time-dependent polarization light waveforms with spatiotemporal resolution, using a compact twofold spectral interferometer, based on in-line bulk interferometry and fibre-optic coupler assisted interferometry. We measure structured infrared femtosecond vector beams, including radially polarized beams and complex-shaped beams exhibiting both temporal and spatial evolving polarization. Our measurements confirm that light waveforms with polarization evolving at the micrometer and femtosecond scales can be achieved through the use of structured waveplates and polarization gates. This new scale of measurement achieved will open the way to predict, check and optimize applications of structured vector beams at the femtosecond and micrometer scales.

show abstract

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Complete spatiotemporal and polarization characterization of ultrafast vector beams

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Those phases can be calculated from the ordinary and extraordinary refractive indices of the MWP from their Sellmeier equations [23], provided that the thickness is known. The relative phase of the plate axes may be known if the phase retardation is given by the manufacturer or can be calibrated, as we do in the experiments (e.g., using the technique described in [24]). As described in Section 2, the expression in Eq.…”

Section: Reconstruction Algorithmmentioning

confidence: 99%

Compact in-line temporal measurement of laser pulses with amplitude swing

Alonso¹,

Holgado²,

Sola³

2020

Opt. Express

Self Cite

View full text Add to dashboard Cite

A method of ultrashort laser pulse reconstruction is presented, consisting on the analysis of the nonlinear signal obtained from the interference of the pulse with a replica of itself at a given time delay while varying the relative amplitude between the pulses. The resulting spectral traces are analyzed both analytically and numerically, showing the encoding of the input pulse spectral phase. A reconstruction algorithm is discussed and applied to extract the spectral phase and, jointly to the measured spectral amplitude, reconstructing the pulse. In order to validate the technique, an experimental in-line implementation of the characterization concept is compared to the results from a stablished technique, obtaining a good agreement at different input pulse cases. In sum, a new technique is presented, showing the capability to reconstruct a broad range of temporal pulse durations while its implementation is robust and straightforward, able to be easily adapted to diverse pulse duration and central wavelength ranges.

show abstract

“…Here, we also use iterative optimization by means of the Levenberg–Marquardt algorithm. In the experiments, we characterize with precision the phase retardation of the MWP for the central wavelength by using inline interferometry 19 , while the global phase due to the dispersion of the fast and slow axes is calculated from the material Sellmeier equations 20 .…”

Section: Introductionmentioning

confidence: 99%

Robustness and capabilities of ultrashort laser pulses characterization with amplitude swing

Sola

Alonso

2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

In this work we firstly study the influence of different parameters in the temporal characterization of ultrashort laser pulses with the recently developed amplitude swing technique. In this technique, the relative amplitude of two delayed replicas is varied while measuring their second-harmonic spectra. Here we study the retrieval of noisy traces and the implications of having different delays or phase retardations (relative phases) between the two replicas. Then, we study the capability of the technique to characterize the pulses when the second-harmonic signal is spectrally uncalibrated or incomplete, presenting the analytical calculation of the marginal, which is used to calibrate the traces and to perform the pulse retrievals. We experimentally show the retrieval of different pulses using diverse delays and phase retardations to perform the amplitude swing trace and demonstrate that, from an uncalibrated trace, both the pulse information and the response of the nonlinear process can be simultaneously retrieved. In sum, the amplitude swing technique is shown to be very robust against experimental constraints and limitations, showing a high degree of soundness.

show abstract

Measurement of Ultrashort Vector Pulses From Polarization Gates by In-Line, Single-Channel Spectral Interferometry

Cited by 21 publications

References 48 publications

Complete spatiotemporal and polarization characterization of ultrafast vector beams

Complete spatiotemporal and polarization characterization of ultrafast vector beams

Compact in-line temporal measurement of laser pulses with amplitude swing

Robustness and capabilities of ultrashort laser pulses characterization with amplitude swing

Contact Info

Product

Resources

About