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Experimental studies reveal spatial chirp effects in a terahertz beam from a combined crystal, indicating advanced spectrum shaping capabilities.
We present experimental studies of the spatial chirp in a terahertz beam generated by optical rectification in a mosaic combined crystal composed of OH1 and DSTMS organic segments. A comparative analysis of the spatial chirp is performed between the mosaic combined crystal and the individual OH1 and DSTMS crystals. It is shown that, for all crystals, increasing the radial offset from the beam center leads to spectral narrowing and a redshift, accompanied by temporal broadening and a decrease in amplitude. These results confirm that composite structures based on OH1 and DSTMS crystals are effective tools for shaping the THz spectrum without compromising its spatio-temporal properties.
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Ovchinnikov et al. (2026) studied this question.
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