Average-Power Scaling of Gas-Plasma Generated THz Radiation

2021 ◽  
Author(s):  
Joachim Buldt ◽  
Henning Stark ◽  
Michael Muller ◽  
Christian Grebing ◽  
Cesar Jauregui ◽  
...  
Keyword(s):  
Average Power ◽  
Thz Radiation ◽  
Power Scaling ◽  
Gas Plasma

scholarly journals Gas-plasma based generation of broadband THz radiation with 640 mW average power

2021 ◽  
Author(s):  
Joachim Buldt ◽  
Henning Stark ◽  
Michael Müller ◽  
Christian Grebing ◽  
Cesar Jauregui ◽  
...  
Keyword(s):  
Average Power ◽  
Thz Radiation ◽  
Gas Plasma

scholarly journals Fiber laser-driven gas plasma-based generation of THz radiation with 50-mW average power

2019 ◽  
Vol 126 (1) ◽  
Author(s):  
Joachim Buldt ◽  
Michael Mueller ◽  
Henning Stark ◽  
Cesar Jauregui ◽  
Jens Limpert
Keyword(s):  
Fiber Laser ◽  
Repetition Rate ◽  
Laser System ◽  
Average Power ◽  
High Repetition Rate ◽  
Thz Radiation ◽  
Thz Generation ◽  
Nonlinear Responses ◽  
Gas Plasma ◽  
Imaging And Spectroscopy

AbstractWe present on THz generation in the two-color gas plasma scheme driven by a high-power, ultrafast fiber laser system. The applied scheme is a promising approach for scaling the THz average power but it has been limited so far by the driving lasers to repetition rates up to 1 kHz. Here, we demonstrate recent results of THz generation operating at a two orders of magnitude higher repetition rate. This results in a unprecedented THz average power of 50 mW. The development of compact, table-top THz sources with high repetition rate and high field strength is crucial for studying nonlinear responses of materials, particle acceleration or faster data acquisition in imaging and spectroscopy.

scholarly journals Mitigation of stimulated Raman scattering in kilowatt-level diode-pumped fiber amplifiers with chirped and tilted fiber Bragg gratings

2019 ◽  
Vol 7 ◽  
Author(s):  
Meng Wang ◽  
Le Liu ◽  
Zefeng Wang ◽  
Xiaoming Xi ◽  
Xiaojun Xu
Keyword(s):  
Raman Scattering ◽  
Fiber Lasers ◽  
Stimulated Raman Scattering ◽  
Beam Quality ◽  
Average Power ◽  
Fiber Amplifiers ◽  
Maximum Output ◽  
Power Scaling ◽  
Diode Pumped ◽  
Stimulated Raman

The average power of diode-pumped fiber lasers has been developed deeply into the kW regime in the past years. However, stimulated Raman scattering (SRS) is still a major factor limiting the further power scaling. Here, we have demonstrated the mitigation of SRS in kilowatt-level diode-pumped fiber amplifiers using a chirped and tilted fiber Bragg grating (CTFBG) for the first time. The CTFBG is designed and inscribed in large-mode-area (LMA) fibers, matching with the operating wavelength of the fiber amplifier. With the CTFBG inserted between the seed laser and the amplifier stage, an SRS suppression ratio of ${\sim}10~\text{dB}$ is achieved in spectrum at the maximum output laser power of 2.35 kW, and there is no reduction in laser slope efficiency and degradation in beam quality. This work proves the feasibility and practicability of CTFBGs for SRS suppression in high-power fiber lasers, which is very useful for the further power scaling.

scholarly journals Security-aware dual-hop communication for amplify-and-forward relay networks

2019 ◽  
Vol 15 (9) ◽  
pp. 155014771987807
Author(s):  
Fei Ding ◽  
Xiaojun Sun ◽  
Xiaojin Ding ◽  
Ruoyu Su ◽  
Dengyin Zhang ◽  
...  
Keyword(s):  
Ad Hoc Networks ◽  
Secure Communication ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Average Power ◽  
Base Station ◽  
Power Scaling ◽  
Message Delivery ◽  
Amplify And Forward ◽  
Hoc Networks

The authentication scheme for vehicular ad hoc networks aims to improve the security and integrity of message delivery. The base station manages a large number of vehicular nodes, so the security communications are non-trivial. In this article, we propose an amplify-and-forward strategy for a dual-hop cooperative network in order to improve secure communications for vehicular ad hoc networks. We assume that each vehicular node equipped with a single antenna and derive closed-form expressions for the secure communication rate calculation. Moreover, we propose a cooperative strategy by jointly considering average power scaling and instantaneous power scaling, which are proved to be able to achieve information security. The simulation result shows that the proposed scheme can achieve better performance in scenarios with different signal-to-noise ratio.

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