Topic
Harmonic
About: Harmonic is a research topic. Over the lifetime, 44833 publications have been published within this topic receiving 495922 citations. The topic is also known as: overtone & partial.
Papers published on a yearly basis
Papers
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TL;DR: This work presents what is believed to be the first experimental demonstration of guided-wave phase-matched frequency mixing and harmonic conversion in gases using an ultrafast Ti:sapphire amplifier system using 2?
Abstract: We present what is believed to be the first experimental demonstration of guided-wave phase-matched frequency mixing and harmonic conversion in gases. Broad-bandwidth ultrafast pulses, tunable around 270 nm, were generated from an ultrafast Ti:sapphire amplifier system using 2ω+2ω-ω parametric wave mixing in a capillary waveguide. We achieved nonresonant phase matching by coupling both the fundamental and the second-harmonic light into the lowest-order mode. The output 3ω pulses have an energy of >4 µJ at a 1–kHz repetition rate. Simple extensions of this method can generate higher-energy 10–20-fs pulses tunable throughout the vacuum ultraviolet.
161 citations
TL;DR: A new real-time detecting method based on adaptive interference canceling theory for harmonic and reactive currents that is useful for dynamic compensation equipment such as active power filters, static VAr compensators, etc.
Abstract: The conventional detecting methods for power system harmonic and reactive currents have various limitations. Based on adaptive interference canceling theory, a new adaptive detecting method for harmonic and reactive currents is presented, the corresponding detection system is developed, and experiments are performed which verify the feasibility of the method proposed. The new real-time detecting method is useful for dynamic compensation equipment such as active power filters, static VAr compensators, etc. >
161 citations
TL;DR: In this article, an a-c voltage control technique is described that eliminates the third and fifth harmonic voltage present in the load-voltage waveform of a 2-controlled rectifier or transistor d-c to a-C single-phase inverter.
Abstract: An a-c voltage control technique is described that eliminates the third and fifth harmonic voltage present in the a-c load-voltage waveform of a 2-controlled-rectifier or transistor d-c to a-c single-phase inverter. The addition of two more controlled rectifiers or transistors to the basic circuit makes it possible to control the fundamental frequency component of the a-c load voltage from maximum to zero without reintroducing the third and fifth harmonics. The same technique can be used in a 12-controlled-rectifier or transistor d-c to 3-phase a-c inverter. In the case of the 3-phase inverter, the lowest harmonic of the fundamental frequency present in the line-to-line a-c voltage is the eleventh.
161 citations
TL;DR: A convex optimization problem is defined for the design of high-order repetitive controllers, where a trade-off can be made between robustness for changes in the period time and for reduction of the error spectrum in-between the harmonic frequencies.
161 citations
TL;DR: Intensity dependent high harmonic generation was investigated when both short and long trajectories contribute to the emission and directly observed for the first time clear indication of quantum-path interference through harmonic spectrum modulations.
Abstract: We have investigated the intensity dependence of high-order harmonic generation in argon when the two shortest quantum paths contribute to the harmonic emission. For the first time to our knowledge, experimental conditions were found to clearly observe interference between these two quantum paths that are in excellent agreement with theoretical predictions. This result is a first step towards the direct experimental characterization of the full single-atom dipole moment and demonstrates an unprecedented accuracy of quantum path control on an attosecond time scale.
161 citations