Control of THz field waveform emitted from air plasma by chirping two-color laser pulses
Few-cycle terahertz pulses can be effectively generated in air plasma by mixing an ultrashort laser pulse with its second harmonic. The temporal overlap between these two pulses is critical, which can degrade with the mismatch of group velocities. However, the overlap between the fundamental and sec...
Elmentve itt :
| Szerzők: | |
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| Dokumentumtípus: | Cikk |
| Megjelent: |
2019
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| Sorozat: | OPTICS COMMUNICATIONS
436 |
| Tárgyszavak: | |
| doi: | 10.1016/j.optcom.2018.12.020 |
| mtmt: | 31240920 |
| Online Access: | http://publicatio.bibl.u-szeged.hu/27936 |
| Tartalmi kivonat: | Few-cycle terahertz pulses can be effectively generated in air plasma by mixing an ultrashort laser pulse with its second harmonic. The temporal overlap between these two pulses is critical, which can degrade with the mismatch of group velocities. However, the overlap between the fundamental and second harmonic can be controlled by pre-stretching the temporally separated pulses. In this paper, we study the role of chirp and the relative phase between the fundamental and its second harmonic in the formation of the terahertz waveform. We demonstrate experimentally and explain within the context of transient photocurrent model, that the combination of chirping and relative phase shifting can provide a powerful tool to control the waveform of the terahertz pulse. |
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| Terjedelem/Fizikai jellemzők: | 222-226 |
| ISSN: | 0030-4018 |