Details
| Original language | English |
|---|---|
| Article number | 173103 |
| Journal | Journal of Applied Physics |
| Volume | 125 |
| Issue number | 17 |
| Early online date | 1 May 2019 |
| Publication status | Published - 7 May 2019 |
Abstract
We demonstrated terahertz (THz) radiation generated from a three-color laser-excited filament in air for a wide tuning range and various wavelength ratios of the pump laser pulses. As a pump source, the radiation of the femtosecond Ti:sapphire laser and infrared output of the optical parametric generator were used. It was found that the spectrum of generated THz pulses spans up to 50 THz, while the overall THz generation efficiency is of an order of magnitude larger than the one produced by two-color pulses in an analogous configuration. Our results support the idea that three-color pulses are more suitable for broadband THz generation, since the corresponding waveforms can produce faster free electrons in larger quantities. We have found that the conversion efficiency is significantly limited due to intensity clamping. The spectral broadening of THz radiation is explained by aperiodicity of ionization events in time.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Journal of Applied Physics, Vol. 125, No. 17, 173103, 07.05.2019.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Terahertz radiation generation by three-color laser pulses in air filament
AU - Vaičaitis, V.
AU - Balachninaite, O.
AU - Morgner, Uwe
AU - Babushkin, Ihar
N1 - Funding information: The research leading to these results has received funding from LASERLAB-EUROPE (Grant Agreement No. 654148, European Union’s Horizon 2020 research and innovation programme). I.B. and U.M. thank Deutsche Forschunggemeinschaft (DFG) (Project Nos. BA 4156/4-2 and MO 850-19/2) and Germany’s Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project No. 390833453).
PY - 2019/5/7
Y1 - 2019/5/7
N2 - We demonstrated terahertz (THz) radiation generated from a three-color laser-excited filament in air for a wide tuning range and various wavelength ratios of the pump laser pulses. As a pump source, the radiation of the femtosecond Ti:sapphire laser and infrared output of the optical parametric generator were used. It was found that the spectrum of generated THz pulses spans up to 50 THz, while the overall THz generation efficiency is of an order of magnitude larger than the one produced by two-color pulses in an analogous configuration. Our results support the idea that three-color pulses are more suitable for broadband THz generation, since the corresponding waveforms can produce faster free electrons in larger quantities. We have found that the conversion efficiency is significantly limited due to intensity clamping. The spectral broadening of THz radiation is explained by aperiodicity of ionization events in time.
AB - We demonstrated terahertz (THz) radiation generated from a three-color laser-excited filament in air for a wide tuning range and various wavelength ratios of the pump laser pulses. As a pump source, the radiation of the femtosecond Ti:sapphire laser and infrared output of the optical parametric generator were used. It was found that the spectrum of generated THz pulses spans up to 50 THz, while the overall THz generation efficiency is of an order of magnitude larger than the one produced by two-color pulses in an analogous configuration. Our results support the idea that three-color pulses are more suitable for broadband THz generation, since the corresponding waveforms can produce faster free electrons in larger quantities. We have found that the conversion efficiency is significantly limited due to intensity clamping. The spectral broadening of THz radiation is explained by aperiodicity of ionization events in time.
UR - http://www.scopus.com/inward/record.url?scp=85065181717&partnerID=8YFLogxK
U2 - 10.1063/1.5078683
DO - 10.1063/1.5078683
M3 - Article
AN - SCOPUS:85065181717
VL - 125
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 17
M1 - 173103
ER -