Optical pump-probe spectroscopic techniques have been for many decades essential tools to understand various ultrafast dynamic phenomena such as photo-induced dissociation of molecules and exciton dynamics in semiconductors. In these techniques, the intense pump beam is first employed to excite the material near the resonant wavelength, and then the weak probe beam monitors any changes in absorption/transmission spectra, induced by the pump beam, at various time delays between the pump and probe beams. In general, these changes occur at a wide spectral range, and the resonant frequency depends on the materials as well. Accordingly, generating a broad spectral range of the intense ultrashort pulses is one of the most important requirements for understanding the ultrafast dynamics of materials with pump-probe techniques.
In this Optics Letters article, by using optical synchronization of their mid-IR optical parametric chirped pulse amplification system, M. Baudisch et al. successfully demonstrate MW femtosecond (fs) laser pulses generated with high stability at various wavelengths: 3100, 1620, 810, 405, and 270 nm. Therefore, by making use of the authors’ system, it is clearly expected that one can reveal ultrafast dynamics of materials at unexplored wavelengths, since the wavelength range of high peak fs pulse outputs range from the deep UV to the mid-IR.
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