Broadband THz spectroscopy system beyond 25 THz using BNA crystals and a tunable single-ring-fiber compressor
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866913012662665216 |
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| author | Cui, Wei Vishnuradhan, Aswin Lippl, Markus Yalavarthi, Eeswar Kumar Gamouras, Angela Joly, Nicolas Ménard, Jean-Michel |
| author_facet | Cui, Wei Vishnuradhan, Aswin Lippl, Markus Yalavarthi, Eeswar Kumar Gamouras, Angela Joly, Nicolas Ménard, Jean-Michel |
| contents | We present a terahertz time-domain spectroscopy (THz-TDS) system which accesses a broadband spectrum, efficiently covering the so-called "new THz gap" between 5 and 15 THz and extending beyond 25 THz. The system exploits nonlinear interactions within the organic crystal BNA (N-benzyl-2-methyl-4-nitroaniline) to generate and detect THz radiation upon excitation by a near-infrared (NIR) pulse centered at 1.03 $μ$m. To enable broadband THz spectral monitoring, the NIR pulse from a Yb-based solid-state laser undergoes spectral broadening in a gas-filled single-ring hollow-core photonic crystal fiber, followed by a pulse compression to achieve durations as short as 31 fs. This approach paves the way for broadband spectroscopy in hard-to-access THz regions using widely available near-infrared ultrafast sources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_11764 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Broadband THz spectroscopy system beyond 25 THz using BNA crystals and a tunable single-ring-fiber compressor Cui, Wei Vishnuradhan, Aswin Lippl, Markus Yalavarthi, Eeswar Kumar Gamouras, Angela Joly, Nicolas Ménard, Jean-Michel Optics We present a terahertz time-domain spectroscopy (THz-TDS) system which accesses a broadband spectrum, efficiently covering the so-called "new THz gap" between 5 and 15 THz and extending beyond 25 THz. The system exploits nonlinear interactions within the organic crystal BNA (N-benzyl-2-methyl-4-nitroaniline) to generate and detect THz radiation upon excitation by a near-infrared (NIR) pulse centered at 1.03 $μ$m. To enable broadband THz spectral monitoring, the NIR pulse from a Yb-based solid-state laser undergoes spectral broadening in a gas-filled single-ring hollow-core photonic crystal fiber, followed by a pulse compression to achieve durations as short as 31 fs. This approach paves the way for broadband spectroscopy in hard-to-access THz regions using widely available near-infrared ultrafast sources. |
| title | Broadband THz spectroscopy system beyond 25 THz using BNA crystals and a tunable single-ring-fiber compressor |
| topic | Optics |
| url | https://arxiv.org/abs/2601.11764 |