Researchers observe excitonic Bloch-Siegert shift in quantum dots NatureComms
. Pump-probe measurements were conducted using a Pharos Yb: KGW laser as the laser source. The output laser was split into multiple beams, one of which was directed to an optical parametric amplifier to generate wavelength-tunable pump pulses, and the other being delayed by a motorized delay stage and then focused onto a YAG crystal to generate a white light continuum as the probe.
The pump and probe directions were set to a small crossing angel at ~6°, and focused onto the sample with long focal lens of 40 and 25 cm, respectively. For all the detuned pump laser wavelengths, the sizes of the foci on the sample were measured to be in the range 250–300 μm, more than twice larger than the probe beam size . The transmitted probe beam was re-collimated and focused into a fiber-coupled spectrometer to record the variation in absorbance of the sample induced by pump pulses.
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