Two-photon absorption and its saturation in organic terahertz-generator crystals
Absorption at the pump wavelength sensitively influences the achievable terahertz (THz) generation efficiency and the damage threshold of organic THz generator crystals. In the frequently used THz-generator crystals NMBA, BNA, and MNA, we measured the intensity-dependent transmittances and determine...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
2025
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| Sorozat: | OPTICAL MATERIALS EXPRESS
15 No. 8 |
| Tárgyszavak: | |
| doi: | 10.1364/OME.557213 |
| mtmt: | 36289041 |
| Online Access: | http://publicatio.bibl.u-szeged.hu/39715 |
| Tartalmi kivonat: | Absorption at the pump wavelength sensitively influences the achievable terahertz (THz) generation efficiency and the damage threshold of organic THz generator crystals. In the frequently used THz-generator crystals NMBA, BNA, and MNA, we measured the intensity-dependent transmittances and determined the effective low-intensity two-photon absorption coefficients for pulses at 780 nm central wavelength. We observed the saturation of two-photon absorption in BNA and MNA and gave values for the corresponding effective saturation intensities. Our results enable better numerical models of THz generation and optical heating, with nonlinear pump absorption included, to aid the design of simple and robust strong-field THz sources using organic crystals directly pumped by femtosecond lasers. |
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| Terjedelem/Fizikai jellemzők: | 10 2056-2065 |
| ISSN: | 2159-3930 |