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1.
Opt Express ; 19(25): 25355-66, 2011 Dec 05.
Artículo en Inglés | MEDLINE | ID: mdl-22273927

RESUMEN

We demonstrate that multiple spectral-shearing interferometry increases the precision and accuracy of measurements of the spectral phase of a complex pulse (time-bandwidth product = 125) arising from self-phase modulation in a gas filled capillary. We verify that the measured interferometric phase is accurate to 0.1 rad across the full bandwidth by checking the consistency between the spectral phases of each individual shear measurement. The accuracy of extracting pulse parameters (group delay dispersion, pulse duration and peak intensity) for single shear measurements were verified to better than 10% by comparison with the multishear reconstruction. High order space-time coupling is quantified across a single transverse dimension, verifying the suitability of such pulses for use in strong field experiments.


Asunto(s)
Modelos Teóricos , Análisis Espectral/métodos , Simulación por Computador , Interferometría/métodos , Luz , Dinámicas no Lineales , Dispersión de Radiación
2.
Opt Lett ; 35(20): 3471-3, 2010 Oct 15.
Artículo en Inglés | MEDLINE | ID: mdl-20967103

RESUMEN

We present three-dimensional simulations of optical-parametric chirped-pulse amplification stages for a few-cycle petawatt-class laser. The simulations take into account the effects of depletion, diffraction, walk-off, quantum noise, and the nonlinear refractive index (n(2)). In the absence of n(2) effects, we show these stages can generate 3.67J pulses supporting 4fs transform-limited pulse durations. Adding the nonlinear refractive index to the simulation, the energy output is reduced by ~11% and the bandwidth narrows by ~129nm, increasing the Fourier limit by ~17.5%.

3.
Opt Lett ; 34(24): 3854-6, 2009 Dec 15.
Artículo en Inglés | MEDLINE | ID: mdl-20016636

RESUMEN

We demonstrate the validity of the Shackled-frequency-resolved-optical-gating technique for the complete characterization, both in space and in time, of ultrashort optical pulses that present strong angular dispersion. Combining a simple imaging grating with a Hartmann-Shack sensor and standard frequency-resolved-optical-gating detection at a single spatial position, we are able to retrieve the full spatiotemporal structure of a tilted pulse.

4.
Opt Lett ; 34(19): 2918-20, 2009 Oct 01.
Artículo en Inglés | MEDLINE | ID: mdl-19794767

RESUMEN

We demonstrate efficient optical parametric amplification and generation in a gas-filled hollow-core fiber of near-infrared pulses, peaked at 1.4 microm wavelength, with 5 microJ energy and 45 fs duration at the fiber output. Numerical simulations confirm that the OPA is phase matched through excitation of higher-order fiber modes.

5.
Opt Express ; 17(5): 3587-94, 2009 Mar 02.
Artículo en Inglés | MEDLINE | ID: mdl-19259198

RESUMEN

We present a novel mid-IR source based on optical parametric chirped pulse amplification (OPCPA) generating 96 fs pulses (9.0 cycles) at 3.2 mm with an energy of 1.2 microJ, at a repetition rate of 100 kHz. The amplified spectrum supports a minimum Fourier transform limited pulse duration of 45 fs, or 4.2 cycles. Our use of OPCPA allows the direct amplification of few-cycle pulses at this mid-IR wavelength, and is inherently scalable to higher energies. The seed source for the system is based on difference frequency generation (DFG) between two outputs of the same fibre laser: this source is expected to be intrinsically CEP stable.

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