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"Temporal and spectral correlations in bulk continua and improved use in transient spectroscopy" M. Bradler, E. RiedleJ. Opt. Soc. Am. B 31, 1465 - 1475 (2014). Abstract: Newly generated frequencies during bulk continuum generation with femtosecond pump pulses do not fluctuate statistically and show strong correlations in spectrum and time. When a femtosecond continuum is used as probe light for transient spectroscopic measurements, these correlations result in a seemingly low noise level but large scale pseudo-structures that obscure the interpretation. We investigate the correlations for continua generated in YAG and calcium fluoride plates and incorporate the results into the design of our pump-probe setup. The high degree of correlation to the next pulse is utilized trough chopping of the pump and referencing between successive laser shots. To suppress the adverse effect of the high degree of correlation to other wavelengths, we extend the detection by multi-channel referencing with a second camera. The combination of both referencing schemes renders a precise spectral calibration unnecessary and increases the sensitivity of our spectrometer by a factor of five down to 20 µOD. This is already very close to the shot-noise-limit. To demonstrate the improvements, we present and discuss measurements on two different molecular solutions. BMO authors (in alphabetic order): Maximilian Bradler Eberhard Riedle Order Hardcopy  WWW-Version |
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Letzte Änderung: 2016-09-14 13:34
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