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Generation of ultrashort and intense laser pulses is the primary motive in ultrafast and nonlinear science. Unfortunately, only a limited number of active media allows for scaling ultrashort pulses to energies greater than a few mJ at kHz repetition rate. For this reason, the available wavelengths are extremely restricted. To drive ultrafast processes in novel frequency domains, the ideal approach...
Recent advances in semiconductor film deposition allow for the growth of heavily-doped germanium with effective plasma frequencies above 60 THz, corresponding to wavelengths below 5 μm. This technology paves the way for mid-infrared nanoplasmonics with application in integrated telecommunication systems and enhanced molecular sensing in the so-called vibrational fingerprint spectral region [1].
In artificial light harvesting systems the conversion of light into charges or chemical energy happens on the femtosecond time scale and is thought to involve the incoherent jump of an electron from the optical absorber to an electron acceptor. Here we investigate the primary process of electronic charge transfer dynamics in a carotene-porphyrin-fullerene triad, a prototypical elementary component...
We exploit different optical parametric amplification schemes to generate ultra-broadband pulses with μJ-level energy broadly tunable from the near to the far-IR spectral region. In all cases we approach the single optical cycle limit with suitable compression techniques. Such pulses enable ultrafast spectroscopy on a variety of systems with unprecedented temporal resolution.
We generate 800-nm, sub-7-fs pulses from a degenerate Optical Parametric Amplifier pumped by the second harmonic of a Ti:sapphire system and seeded by supercontinuum generated by a near IR OPA pumped by the same source.
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