| Autor: |
Tochitsky SY, Welch EC, Matteo DA, Panagiotopoulos P, Kolesik M, Moloney JV, Joshi C |
| Jazyk: |
angličtina |
| Zdroj: |
Optics express [Opt Express] 2024 Jan 15; Vol. 32 (2), pp. 2067-2080. |
| DOI: |
10.1364/OE.512074 |
| Abstrakt: |
In the long-wave infrared (LWIR) range, where, due to wavelength scaling, the critical power of Kerr self-focusing P cr in air increases to 300-400 GW, we demonstrate that without external focusing a train of picosecond CO 2 laser pulses can propagate in the form of a single several-centimeter diameter channel over hundreds of meters. The train of 10 µm pulses, for which the total energy ≥20 J is distributed over several near-terawatt picosecond pulses with a maximum power ≤2P cr , is generated naturally during short pulse amplification in a CO 2 laser. It is observed that the high-power 10 µm beam forms a large diameter "hot gas" channel in the ambient air with a ≥ 50 ms lifetime. Simulations of the experiment show that such filamentation-free self-channeling regime has low propagation losses and can deliver multi-Joule/TW-power LWIR pulses over km-scale distances. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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