Journal
OPTICS LETTERS
Volume 45, Issue 7, Pages 2132-2135Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.390112
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Funding
- Danish Independent Research [DFF-6111-00119]
- LAPHIA Student mobility
- Conseil Regional Nouvelle Aquitaine
- FEDER
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In this Letter, we demonstrate that the far-field terahertz (THz) beam generated from a TisSapphire two-color laser-induced filament can exhibit a conical or Gaussian distribution, depending on the filtering experimental conditions. Using both an incoherent Golay cell detector and a two-dimensional coherent electro-optic detection covering the 0.2-2.6 THz spectral range, in our experimental conditions, we provide evidence that the conical emission is due to photo-induced carriers in the silicon filter, typically used to block the remaining pump laser light. Moreover, the low-frequency THz beam retrieves an almost TEM00 Gaussian spatial distribution when the silicon filter is preceded by a large bandgap ceramic filter, which stops the pump beam, thus preventing the carrier generation in the silicon filter. (C) 2020 Optical Society of America
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