Journal
OPTICA
Volume 4, Issue 5, Pages 516-519Publisher
Optica Publishing Group
DOI: 10.1364/OPTICA.4.000516
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Funding
- Russian Foundation for Basic Research (RFBR) [14-29-07182, 17-52-53092, 15-02-07820, 16-02-00843]
- Russian Science Foundation (RSF)
- Welch Foundation [A-1801]
- Government of Russian Federation [14.Z50.31.0040]
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High-harmonic generation (HHG) has recently been extended to solids, enabling all-optical reconstruction of electron band structure. However, material absorption of above-the-bandgap interband harmonics used for this purpose in earlier work limits the applicability of this promising technique. Here, sub-100-fs mid-infrared pulses tunable within the range of wave-lengths from 5.0 to 6.7 mu m are used to study HHG in ZnSe. Below-the-bandgap high-order harmonics generated by such driver pulses fall within the transparency range of a solid material, thus removing absorption-related limitations on the depth of HHG. Such harmonics are shown to be ideally suited to probe the nonlinearities of electron bands, enabling an all-optical mapping of the electron band structure in bulk solids. (C) 2017 Optical Society of America
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