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The ultimate challenge for early diagnostics is labelfree high‐resolution intratissue imaging without taking physical biopsies. A novel hybrid femtosecond laser tomograph provides in vivo optical biopsies of human skin based on non‐linear excitation of autofluorescence and the detection of lipids and water by CARS. Applications include skin cancer detection, biosafety tests of intradermal nanoparticles,...
The optical coherent control of the exciton-biexciton system is studied in four-wave-mixing (FWM) experiments on a ZnSe single-quantum well. Coherent control is achieved by applying a pair of phase-locked laser pulses which produce an FWM signal in combination with an additional third pulse. Oscillations as a function of the interpulse delay time are observed in the FWM signal at the energetic position...
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