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Stimulated Mie scattering in nanocrystals suspension
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Linear extinction spectra of a 1-mm chloroform (dotted line) and 1-mm CdSe/Cds/ZnS nanocrystals/chloroform samples with different concentrations (solid line and dot-dashed line), respectively; the TEM image of CdSe/Cds/ZnS nanocrystals (abbreviated as CdSe NCs) is shown in the inset. (b) Experimental setup for generating backward stimulated Mie scattering in a CdSe Ncs/CHCl3 sample filled in a quartz cuvette (with high optical quality) or in an ordinary glass vial (with poor optical quality).

Image of FIG. 2.
FIG. 2.

High-resolution spectral photographs of (a) ∼816-nm pump beam, (b) both the pump beam and the backward SS beam, and (c) the SS beam alone. The spectral profiles of the pump line and the stimulated scattering line are shown in (d). The photographs of (a)–(c) are taken by single pulse exposure.

Image of FIG. 3.
FIG. 3.

Far-field photographs of (a) input pump beam, (b) backward stimulated scattering beam from a glass vial filled with CdSe NCs/CHCl3, and (c) forward transmitted pump beam passed through the vial sample. (d) The intensity profiles of the input pump beam and the backward stimulated scattering beam on the focal plane of an f = 40 cm focusing lens, in corresponding to (a) and (b).

Image of FIG. 4.
FIG. 4.

Normalized waveforms of the pump pulse (a) and the backward stimulated scattering pulses at different pump energy (Ep) levels (b)–(e). The waveforms (b)–(e) are normalized on the peak intensity value of the stimulated scattering pulse pumped at Ep = 4.0 mJ. Each waveform curve is recorded by a single pulse signal.

Image of FIG. 5.
FIG. 5.

Backward stimulated scattering energy versus the pump pulse energy, measured in two CdSe NCs/CHCl3 samples with different concentrations. The maximum efficiency from the pump energy to the stimulated scattering energy is η ≈ 32%.

Image of FIG. 6.
FIG. 6.

F-P interferograms of (a) 1064-nm pump beam, (b) backward SMS beam from a CdSe NCs/CHCl3 sample, (c) both pump and SMS beams, and (d) both pump and the SBS beam from a pure CHCl3 sample. All photographs are taken by single pulse exposure.


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Scitation: Stimulated Mie scattering in nanocrystals suspension