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We present a contrast filter reaching 12 orders of magnitude from micro to milliJoule input pulse with 24% efficiency. It solves contrast issue for Petawatt class lasers in microjoule seeded CPA or double CPA scheme.
We have demonstrated a beam scanning multi-photon multi-harmonic endoscope based on a flexible fiber bundle. Excited by a femtosecond Cr:Forsterite laser, multi-photon multi-harmonic excitation efficiencies are recovered without any external devices.
The intensity-related carrier-envelope phase dynamics of octave-spanning Ti:sapphire lasers is investigated. Taking the laser gain dynamics into account, quantitative agreement between the measured and predicted carrier-envelope phase noise resulting from pump laser noise is achieved.
We observed the interference spectrum that depends on the carrier-envelope phase using a few-cycle laser pulse. The phenomenon is based on the interference between the second and third harmonics generated from a ZnO thin film.
A new pulsed spectroscopic technique combines optical heterodyne detection with frequency binning. Its utility is demonstrated via Doppler-free two-photon excitation in cesium using an injection-seeded pulsed optical parametric oscillator, operated close to the Fourier-transform limit.
We demonstrate an ultrasimple, extremely broadband, alignment-free, and single-shot Transient-Grating Frequency-Resolved-Optical-Gating device using a mask to separate the input beam into three beams and a Fresnel biprism to cross and delay them.
A high-resolution THz-spectrometer without mechanical delay-line is demonstrated. THz-field-transients with 1 ns duration are acquired at 9 kHz scan-rate. Spectra up to 3 THz are obtained with a 40 dB signal-to-noise ratio within 250 s of total measurement time.
We study the characteristic conical emission of a blue femtosecond filament in air. A significant improvement of the beam quality is obtained during the filamentation process.
We describe measurements characterizing the interaction of ultra-high intensity Petawatt laser pulses with solid targets. Experiments were performed on the Petawatt laser at RAL, and the Titan laser at LLNL.
We measured the 4s 2S1/2 - 4p 2P1/2 and 4s 2S1/2 - 4p 2P3/2 transitions of potassium with an absolute accuracy better than 100 kHz. The isotopes 39, 40, and 41 are investigated in an atomic beam apparatus.
Experimental studies of the electron and hole concentration dynamics in the barrier of GaSb-based type-II quantum-well (QW) heterostructures was performed. Difference between electron and hole relaxation rates is explained by corresponding QW carrier confinement energies.
Polarization gated high harmonic generation was phase matched to produce 104 XUV photons per shot. This allowed us to observe the dependence of the XUV supercontinuum on the carrier envelope phase of the laser pulses.
We present a very simple, linear, and general technique for measuring the complete electric field, E(x,y,z,t), of a single ultrashort laser pulse in a single interferogram containing multiple digital holograms simultaneously recorded at different wavelengths.
Using a spatially encoded arrangement for SPIDER, we accurately measure ultra-broadband sub-10-fs pulses that can exhibit a modulated spectrum and space-time coupling. The intuitive interferograms can be acquired single shot and real time.
When the laser field consisting of sub-10-fs fundamental and its second harmonic was used for high harmonic generation, a continuum centered at 30 nm with a spectral bandwidth of 8 nm was obtained with an energy of 10 nJ.
The gain and index dynamics of a QD amplifier operating at 1.55 mum are characterized via heterodyne pump-probe measurements with 150 fs resolution. A 13 ps gain recovery time was found, promising for all-optical signal processing.
We present a new scheme of Ti:Sa laser amplification, based on second harmonic generation from a Ti:Sa laser tuned at 496 nm by an OPA system and amplification in an excimer double cavity.
We report on the generation of 550 mW of 460 nm blue radiation by single pass frequency doubling the picosecond pulses of a mode-locked InGaAs diode laser MOPA system in periodically poled KTP.
Optical-pump, terahertz-probe reflection spectroscopy was investigated for the study of femtosecond laser-induced ablation dynamics. The technique can directly measure the quasi-DC complex electrical conductivities of laser-heated solids using non-contact terahertz probe pulses.
The results of experimental measurement of small surface oscillations using a femto-second laser are presented. Itpsilas shown that the use of ldquochirpedrdquo pulses allows to reduce the contribution of correlated noise to the signal-to-noise ratio.
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