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| 1 | Local measurement of terahertz field-induced second harmonic generation in plasma filaments显示文摘The concept of Terahertz Field-Induced Second Harmonic(TFISH)Generation is revisited to introduce a single-shot detection scheme based on third order nonlinearities.Focused specifcally on the further development of THz plasma-based sources,we begin our research by reimagining the TFISH system to serve as a direct plasma diagnostic.In this work,an optical probe beam is used to mix directly with the strong ponderomotive current associated with laser-induced ionization.A four-wave mixing(FWM)process then generates a strong second-harmonic optical wave because of the mixing of the probe beam with the nonlinear current components oscillating at THz frequencies.The observed conversion efciency is high enough that for the frst time,the TFISH signal appears visible to the human eye.We perform spectral,spatial,and temporal analysis on the detected second-harmonic frequency and show its direct relationship to the nonlinear current.Further,a method to detect incoherent and coherent THz inside plasma flaments is devised using spatio-temporal couplings.The single-shot detection confgurations are theoretically described using a combination of expanded FWM models with Kostenbauder and Gaussian Q-matrices.We show that the retrieved temporal traces for THz radiation from single-and twocolor laser-induced air-plasma sources match theoretical descriptions very well.High temporal resolution is shown with a detection bandwidth limited only by the spatial extent of the probe laser beam.Large detection bandwidth and temporal characterization is shown for THz radiation confned to under-dense plasma flaments induced by<100 fs lasers below the relativistic intensity limit. | Kareem J.Garriga Francis Xi‑Cheng Zhang | 2023 | Frontiers of Optoelectronics2023，16，4： | 0 |
| 2 | Making and breaking terahertz waves with fluid plasmas显示文摘Vigorous research efforts during the past several decades have successfully closed the'terahertz gap'between microwaves and infrared lig ht,offering new and increasingly efficient ways to produce,detect,and manipulate radiation fields in the terahertz(THz)frequency range.In our laboratory,THz time he itspy IDS)and optical-pumрTHz-its have been routinely utilized as ulltrafast spectrosopy tools to investigate a variety of emerg ing quantum materinls pulses are produced by femtosecond laser excitation of photo-and metamaterials!.The ultrafast THz conductive antennas,semiconductor surfaces(InAs),and non-linear crystals(ZnTe,GaSe.and LiNbO,).Photoconductive an tennas and nonlinear crystals also al low for the coherent de-tection of these pulses in the time domain,with amplitude and phase spectra obtained in the frequency domain via fast Fourier transform.Although such solid-state schemes are highly desirable in many aspects and thus also commonly utilized in many research laboratories and industrial applications,they typically sufer from limited bandwidths due to the absorption and frequency dispersion induced primarily by pho-non resonances,limiting THz applications such as spectroscopрy of emerging materinl,l,imaging ansd detection4.5 and biomedi-cal chuacterization. | Jacob Pettine Hou-Tong Chen | 2023 | Photonics Insights2023，2，3： | 0 |
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