Detection of HCl molecules by resonantly enhanced third-harmonic generation, driven by midinfrared laser pulses
| Autor: | Jan Frederic Kinder, Thomas Halfmann, Fabian Cipura |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Physical Review A. 103 |
| ISSN: | 2469-9934 2469-9926 |
| Popis: | We studied resonantly enhanced third-harmonic generation, induced by midinfrared, spectrally narrow-band, nanosecond laser pulses tuned in the vicinity of rovibrational molecular resonances. As we drive the frequency conversion process simultaneously close to single-, two-, and three-photon resonances, we get strong resonance enhancements of the third-harmonic yield by several orders of magnitude. The experimental setup requires only a single midinfrared laser beamline; the signal wavelength is easily separable from the much longer driving laser wavelength. We performed extended, systematic studies on the third-harmonic yield, spectral line shape and linewidth with laser intensity, frequency, and pressure. We determined a detection limit of ${10}^{15}$ $\mathrm{molecules}/{\mathrm{cm}}^{3}$, which indicates the potential of the approach for realistic applications in trace gas detection. |
| Databáze: | OpenAIRE |
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