Our aim is to explore and push the frontiers in ultrafast science and technology, using interdisciplinary understanding of the physics of lasers, semiconductors. Ultrafast lasers are lasers emitting ultrashort pulses, i.e., pulses with picosecond or even femtosecond durations. Different kind of lasers can be operated in that. Ultrafast laser spectroscopy is a spectroscopic technique that uses ultrashort pulse lasers for .. "Encyclopedia of Laser Physics and Technology - pulse characterization, optical, pulse duration, spectral phase, pulses, FROG, SPIDER". Jump up.


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This means that tracking an electron in an electronic circuit, solar cell or chemical reaction requires experimental probes operating at similar speeds. Understanding — and ultimately controlling — such ultrafast ultrafast laser physics behaviour can potentially open to door to novel ultrafast electronics technologies.


We use femtosecond laser pulses to achieve this. This also makes it possible to vary different control parameters to build up a comprehensive picture of the important factors affecting the ultrafast laser physics and ultrafast laser physics of the specific process of interest. In fact, Swinburne was the first lab in Australia to install one of these amplified laser systems, in The laser diode then couples the light into a fiber where it will be confined.


Different wavelengths can be achieved with the use of doped fiber. The pump light from the laser diode will excite ultrafast laser physics state in the doped fiber which can then drop in energy causing a specific wavelength to be emitted. This wavelength may be different from that of the pump ultrafast laser physics and more useful for a particular experiment.

X-ray generation[ edit ] Ultrafast optical pulses can be used to generate x-ray pulses in multiple ways. An optical pulse can excite an electron pulse via the photoelectric effectand acceleration across a high potential ultrafast laser physics the electrons kinetic energy.

Encyclopedia of Laser Physics and Technology - ultrafast optics, femtosecond, picosecond, pulses

When the electrons hit a target they generate both characteristic x-rays and bremsstrahlung. A second method is via laser induced plasma. When very high intensity laser ultrafast laser physics is incident on a target, it strips electrons off the target creating a negatively charged plasma cloud.

The strong Coulomb force due to the ionized material in the center of the cloud quickly accelerates the electrons back to towards the nuclei left behind. Upon collision with the nuclei, Bremsstrahlung and characteristic emission x-rays are given off.

This ultrafast laser physics of x-ray generation scatters photons in all directions, but also generates picosecond x-ray pulses.

Conversion and characterization[ edit ] Pulse characterization[ edit ] In order for accurate spectroscopic measurements to be made, several characteristics of the laser pulse need to ultrafast laser physics known; pulse duration, pulse energy, spectral phase and spectral shape are among some of these.

Methods allowing for complete characterization of pulses include frequency-resolved optical gating FROG and spectral phase interferometry for direct electric-field reconstruction SPIDER.

Ultrafast Lasers

It will not change the duration or phase of the pulse during the amplification. Pulse compression shorten the pulse duration is achieved by first chirping the pulse in a nonlinear material and broadening the spectrum, with a following compressor for chirp compensation.

Fiber compressor is generally used in this case. Pulse shapers usually refer to optical modulators which applies Fourier transforms to laser ultrafast laser physics. Depending on which property of light is controlled, modulators are called intensity modulators, phase modulators, polarization modulators, spatial light modulators.

Depending on the modulation mechanism, optical ultrafast laser physics are divided into Acoustic-optic modulators, Electro-optic modulators, Liquid crystal modulators etc.

Ultrafast Laser Physics – Ultrafast Laser Physics | ETH Zurich

Each is dedicated into different applications. It was first observed in by McPherson et al. It is realizable on a laboratory scale table-top systems ultrafast laser physics opposed to large free electron-laser facilities. High harmonic generation in atoms is well understood in terms of the three-step model ionization, propagation, and recombination.

The intense laser field modifies the Coulomb potential of the atom, electron tunnels through the barrier and ionize. The free electron accelerates in the laser field and gains momentum.

When the field reverses, the electron is accelerated back toward the ionic parent and releases a photon with very high energy. Related nonlinearities such ultrafast laser physics Raman scattering and self-steepening occur when the nonlinearity has a finite response time.


Chromatic dispersion has a great influence on the effect of such nonlinearities on the pulse formation.

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