Intense sub-two-cycle infrared pulse generation via phase-mismatched cascaded nonlinear interaction in DAST crystal.
Opt Lett
; 39(9): 2660-3, 2014 May 01.
Article
en En
| MEDLINE
| ID: mdl-24784071
ABSTRACT
Octave-spanning, 12.5 fs, (1.9 cycle) pulses with 115 µJ energy in the short-wavelength mid-infrared spectral range (1-2.5 µm) have been generated via phase-mismatched cascaded nonlinear frequency conversion using organic DAST (4-N, N-dimethylamino-4'-N'-methylstilbazolium tosylate) crystal. Such ultrafast cascading effect is ensured by the interaction of a pump pulse with the exceptionally large effective nonlinearity of the DAST crystal and experiencing nonresonant, strongly phase-mismatched, Kerr-like negative nonlinearity.
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