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Gas-plasma-based generation of broadband terahertz radiation with 640 mW average power

Authors :
Christian Grebing
Henning Stark
Joachim Buldt
Michael Müller
Cesar Jauregui
Jens Limpert
Source :
Optics Letters, Optics letters 46(20), 5256-(2021). doi:10.1364/OL.442374
Publication Year :
2021

Abstract

We present a high-power source of broadband terahertz (THz) radiation covering the whole THz spectral region (0.1–30 THz). The two-color gas plasma generation process is driven by a state-of-the-art ytterbium fiber chirped pulse amplification system based on coherent combination of 16 rod-type amplifiers. Prior to the THz generation, the pulses are spectrally broadened in a multipass cell and compressed to 37 fs with a pulse energy of 1.3 mJ at a repetition rate of 500 kHz. A gas-jet scheme has been employed for the THz generation, increasing the efficiency of the process to 0.1%. The air-biased coherent detection scheme is implemented to characterize the full bandwidth of the generated radiation. A THz average power of 640 mW is generated, which is the highest THz average power achieved to date. This makes this source suitable for a variety of applications, e.g., spectroscopy of strongly absorbing samples or driving nonlinear effects for the studies of material properties.

Details

ISSN :
10944087
Database :
OpenAIRE
Journal :
Optics Letters
Accession number :
edsair.doi.dedup.....9cdbbad2b473428dea63e6380f5b5977
Full Text :
https://doi.org/10.1364/ol.442374