Measuring the seemingly immeasurable

Trebino, Rick

doi:10.1038/nphoton.2011.41

Cited by 23 publications

(21 citation statements)

References 21 publications

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“…Owing to its intrinsic coherence, the second harmonic (SH) emitted by a nonlinear crystal is sensitive to the spectral phase of a laser pulse and has therefore been widely used for femtosecond pulse characterization, mainly in combination with frequency-resolved optical gating 9 or spectral phase interferometry for direct electric-field reconstruction of ultrashort optical pulses. 10 The SH has also been used for both pulse characterization and compression with the so-called multiphoton intrapulse interference phase scan (MIIPS) technique.…”

Section: Introductionmentioning

confidence: 99%

Phase control of femtosecond pulses on the nanoscale using second harmonic nanoparticles

et al. 2014

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Investigations of ultrafast processes occurring on the nanoscale require a combination of femtosecond pulses and nanometer spatial resolution. However, controlling femtosecond pulses with nanometer accuracy is very challenging, as the limitations imposed both by dispersive optics on the time duration of a pulse and by the spatial diffraction limit on the focusing of light must be overcome simultaneously. In this paper, we provide a universal method that allows full femtosecond pulse control in subdiffraction-limited areas. We achieve this aim by exploiting the intrinsic coherence of the second harmonic emission from a single nonlinear nanoparticle of deep subwavelength dimensions. The method is proven to be highly sensitive, easy to use, quick, robust and versatile. This approach allows measurements of minimal phase distortions and the delivery of tunable higher harmonic light in a nanometric volume. Moreover, the method is shown to be compatible with a wide range of particle sizes, shapes and materials, allowing easy optimization for any given sample. This method will facilitate the investigation of light-matter interactions on the femtosecond-nanometer level in various areas of scientific study.

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Section: Introductionmentioning

confidence: 99%

Phase control of femtosecond pulses on the nanoscale using second harmonic nanoparticles

et al. 2014

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“…Secondly, we report accelerated laser dynamics of plasmonic lasers compared to conventional photonic ZnO nanowire lasers. Remarkably, we have measured sub-picosecond plasmonic lasers pulses, within the ultrafast regime, where temporal dynamics are generally only accessible by non-linear all-optical techniques 28 . Here we have used a novel double-pump approach that exploits the non-linearity of the laser process to expose its own dynamics.…”

mentioning

confidence: 99%

“…This presents a significant challenge as plasmonic lasers are anticipated to operate in the sub picosecond regime, which is at the limit of electrical detection techniques, such as streak cameras 26 . Generally, non-linear all-optical techniques would be required 28 For < 0 the weak pulse initially excites carriers into the upper level, which rapidly thermalize to the excited state and subsequently recombine spontaneously (Fig. 3a).…”

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confidence: 99%

Ultrafast plasmonic nanowire lasers near the surface plasmon frequency

et al. 2014

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Lasers that use metallic cavities have emerged recently as a new class of light source [1][2][3] . Plasmonic lasers achieve optical confinement and feedback using surface plasmon polaritons (SPPs), quasiparticles of photons and electrons at metal-dielectric interfaces, which can be amplified by suitable optical gain media 4 . The high gain of inorganic crystalline semiconductors is typically necessary to overcome fast electron scattering in metals (~10 fs), which leaves plasmonic lasers with high parasitic cavity loss. Nevertheless, SPPs offer the capability to reduce optical mode sizes far below the scale of the vacuum wavelength 3,5-8 leading to compact lasers that can generate extremely focussed optical excitations on potentially ultrafast time scales 1,9 with applications in Raman sensing

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“…For intense femtosecond lasers with low repetition rate, a single-shot autocorrelator based on non-collinear second harmonic generation (SHG) [8,9] can measure the pulse duration in real-time, by transferring the time profile to a spatial profile in a CCD camera. Most modern techniques, including SHG-FROG, GRENOUILLE, and SHG-SPIDER [10], should consider the elongation effect due to the group velocity dispersion in dispersive optics. To suppress the dispersion problem in ultrashort pulse measurements, an all-reflective autocorreleator has been demonstrated [11][12][13], but these systems, even commercially available ones, are based on the scanning interferometric method using a photodiode detector, which is not proper for real-time characterization.…”

Section: Introductionmentioning

confidence: 99%

The Real-Time Temporal and Spatial Diagnostics of Ultrashort High-Power Laser Pulses using an All-Reflective Single-Shot Autocorrelator

Kim

Park

Kim

et al. 2014

Journal of the Optical Society of Korea

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An all-reflective, simple noncollinear second harmonic (SH) autocorrelator is described for monitoring the shot-to-shot behavior of ultrashort high-power laser pulses. Two mirrors are used for the dispersion-free splitting of a pulse into two halves. One of the mirrors is able to adjust the delay time and angle between two halves of the laser pulse in a nonlinear crystal. We present the possibility of real-time measurement of the pulse duration, peak intensity (or energy), and the pointing jitters of a laser pulse, by analyzing the spatial profile of the SH autocorrelation signal measured by a CCD camera. The measurement of the shot-to-shot variation of those parameters will be important for the detailed characterization of laser accelerated electrons or protons.

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Measuring the seemingly immeasurable

Cited by 23 publications

References 21 publications

Phase control of femtosecond pulses on the nanoscale using second harmonic nanoparticles

Phase control of femtosecond pulses on the nanoscale using second harmonic nanoparticles

Ultrafast plasmonic nanowire lasers near the surface plasmon frequency

The Real-Time Temporal and Spatial Diagnostics of Ultrashort High-Power Laser Pulses using an All-Reflective Single-Shot Autocorrelator

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