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The ultrashort pulse laser treatment may have potential applications in the disinfection of medicines, in the production of inactivated vaccines, [8] and in the possible future treatment of blood-borne viral infections from agents such as HIV and Ebola virus. [citation needed] [9]
Ultrafast laser spectroscopy is a category of spectroscopic techniques using ultrashort pulse lasers for the study of dynamics on extremely short time scales (attoseconds to nanoseconds). Different methods are used to examine the dynamics of charge carriers, atoms, and molecules.
The laser is then retro-reflected. By using a nonlinear medium, the nonlinear (SHG, THG, etc.) spectra vs. the phase scan can be recorded as a MIIPS trace for the characterization of the pulse. Once the pulse is characterized, a compensatory phase can be applied to the ultrashort pulse through the SLM.
Typically, an ultrashort pulsed laser is used in the terahertz pulse generation process. In the use of low-temperature grown GaAs as an antenna, the ultrashort pulse creates charge carriers that are accelerated to create the terahertz pulse. In the use of non-linear crystals as a source, a high-intensity ultrashort pulse produces THz radiation ...
Fig. 1: Schematic diagram of a pulse shaper. Generation of sequences of ultrashort optical pulses is key in realizing ultra high speed optical networks, Optical Code Division Multiple Access (OCDMA) systems, chemical and biological reaction triggering and monitoring etc. Based on the requirement, pulse shapers may be designed to stretch, compress or produce a train of pulses from a single ...
Retrieval of the pulse from its FROG trace is accomplished by using a two-dimensional phase-retrieval algorithm. FROG is currently the standard technique for measuring ultrashort laser pulses replacing an older method called autocorrelation, which only gave a rough estimate for the pulse length. FROG is simply a spectrally resolved ...
The ISKRA-4 laser is a spatially filtered (image relayed) 8 beam photolytically pumped iodine gas laser capable of producing laser pulse energies of around 2 kJ (pulsewidth of about 1 ns) at its fundamental emission wavelength of 1.315 micrometers, though it is also capable of operating in a frequency doubled configuration where it emits light at 658 nm with a pulse energy of around 500 J ...
A similar analysis can be carried out for any pulse shape, such as the hyperbolic secant-squared (sech 2) pulse profile generated by most ultrashort pulse lasers. If the pulse is of sufficient intensity, the spectral broadening process of SPM can balance with the temporal compression due to anomalous dispersion and reach an equilibrium state.
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