100% reliable algorithm for second-harmonic-generation frequency-resolved optical gating

Jafari, Rana; Jones, Travis; Trebino, Rick

doi:10.1364/oe.27.002112

Cited by 39 publications

(14 citation statements)

References 37 publications

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“…Both, visual comparison of the reconstructed spectrograms (see Fig. S4) and the trace-area normalized FROG error G' < 0.05 28,29 of the reconstructed spectrograms indicate good agreement.…”

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confidence: 62%

Slow light nanocoatings for ultrashort pulse compression

et al. 2021

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Transparent materials do not absorb light but have profound influence on the phase evolution of transmitted radiation. One consequence is chromatic dispersion, i.e., light of different frequencies travels at different velocities, causing ultrashort laser pulses to elongate in time while propagating. Here we experimentally demonstrate ultrathin nanostructured coatings that resolve this challenge: we tailor the dispersion of silicon nanopillar arrays such that they temporally reshape pulses upon transmission using slow light effects and act as ultrashort laser pulse compressors. The coatings induce anomalous group delay dispersion in the visible to near-infrared spectral region around 800 nm wavelength over an 80 nm bandwidth. We characterize the arrays’ performance in the spectral domain via white light interferometry and directly demonstrate the temporal compression of femtosecond laser pulses. Applying these coatings to conventional optics renders them ultrashort pulse compatible and suitable for a wide range of applications.

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“…Both, visual comparison of the reconstructed spectrograms (see Fig. S4) and the trace-area normalized FROG error G' < 0.05 28,29 of the reconstructed spectrograms indicate good agreement.…”

mentioning

confidence: 62%

Slow light nanocoatings for ultrashort pulse compression

et al. 2021

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“…5(c)) traces were binned to a 256256 array. We retrieved each pulse using the newly developed and highly reliable RANA Approach for SHG FROG [30], [31].The FROG errors for the SG and CG traces were 0.0068 and 0.0062 respectively. Figures 5(e) and 5(f) attests to the excellent agreement achieved between the CG and SG retrieved results.…”

Section: Resultsmentioning

confidence: 99%

High-Sensitivity, Simple Frequency-Resolved-Optical-Gating Device

Jones

Šušnjar

Petkovšek

et al. 2020

IEEE J. Quantum Electron.

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We introduce a practical self-referenced device for the complete temporal intensity-and-phase measurement of fewfemtojoule-level fs and ps pulses based on the simple version of frequency-resolved-optical gating, called GRENOUILLE. We replace the usual crossed-beam line-focus geometry with a pointfocus near-collinear-beam geometry and a traditional delay line that allows a longer path length in the nonlinear medium, yielding greater sensitivity. As an initial demonstration of the device, we measured moderately complex pulses at energies as weak as 24fJ with high signal-to-noise ratio. We confirmed the results measured using our technique to that of a standard GRENOUILLE and a high-resolution spectrometer.

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“…7a. For the retrieval we used the RANA algorithm [7]. A low G error of 0.0084 and a good agreement between the retrieved and measured spectrum of the pulse (see Fig.…”

Section: Test Of a Highly Sensitive Shg Frog Using A Ppln Crystalmentioning

confidence: 98%

“…In any case, our prediction is still much more accurate than the simple plane wave approximation, which neglects the focusing and the spatial walk-off effects (dashed-dot line). For this reason, we suggest the aperture length as a relevant dimension when estimating the phasematching bandwidth for NCPM SHG from temporal walk-off (GVM×L) or rules (6) or (7) when one is choosing the right focusing.…”

Section: Spectral Bandwidth Of Up-converted Ultrashort Pulsementioning

confidence: 99%

Crystal-Configuration Considerations for Higher-Sensitivity Picosecond-Pulse SHG FROG

Šušnjar

Jones

Trebino

et al. 2020

IEEE J. Quantum Electron.

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We experimentally compare a thick BIBO crystal, a walk-off compensating configuration of thin BBO crystals, and a thin PPLN crystal for the use as a nonlinear medium in SHG FROG, aiming for increased sensitivity required for complete pulse characterization of low-energy (below pJ) pulses a few picoseconds long at wavelengths near 1030 nm. We investigate the dependence of the spectral bandwidth of the frequency-doubled input ultrashort pulse and the conversion efficiency on focal-spot size in the nonlinear crystal. Both numerical and experimental results confirm an increase of the bandwidth with tighter focusing in a thick BIBO and a more-than-threefold increase of conversion efficiency compared to a thin BIBO crystal. A PPLN crystal is found to be the most efficient among the three, but very thin (< 0.3 mm) crystals would be required to extend the measurement capabilities of SHG FROG to sub-ps pulses. A SHG FROG using a PPLN crystal for characterization of picosecond pulse is demonstrated with a sensitivity of 2 ×10 −3 (mW) 2 .

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100% reliable algorithm for second-harmonic-generation frequency-resolved optical gating

Cited by 39 publications

References 37 publications

Slow light nanocoatings for ultrashort pulse compression

Slow light nanocoatings for ultrashort pulse compression

High-Sensitivity, Simple Frequency-Resolved-Optical-Gating Device

Crystal-Configuration Considerations for Higher-Sensitivity Picosecond-Pulse SHG FROG

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