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Generating Electromagnetic Radiations

Generating Electromagnetic Radiations

The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...

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Related Experiment Video

Updated: May 14, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Synchronizing terahertz wave generation with attosecond bursts.

Dongwen Zhang¹, Zhihui Lü, Chao Meng

¹Department of Physics, National University of Defense Technology, Changsha 410073, People's Republic of China.

Physical Review Letters

|February 2, 2013

Summary

This summary is machine-generated.

We precisely measured terahertz (THz) wave generation using attosecond timing. The study reveals that laser-assisted electron-atom collisions, crucial for high-harmonic generation, also drive THz wave production.

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Area of Science:

Quantum optics
Attosecond science
Atomic physics

Background:

High-harmonic generation (HHG) is a key process for producing extreme ultraviolet and X-ray light.
Understanding electron dynamics in atomic systems is crucial for advanced light source development.

Purpose of the Study:

To precisely measure terahertz (THz) wave generation dynamics.
To elucidate the role of electron-rescattering in THz emission.
To correlate THz generation with high-harmonic generation.

Main Methods:

Joint measurement of THz waves and high-harmonics from argon atoms.
Utilizing a fundamental laser pulse and its second harmonic.
Correlating measurements with phase delay between laser pulses.

Main Results:

Achieved tens of attoseconds precision in THz wave generation measurement.
Identified laser-assisted soft collisions as critical for THz emission.
Demonstrated that the rescattering process significantly influences THz wave generation.

Conclusions:

The rescattering process, vital for HHG, plays a dominant and complex role in THz wave generation.
The findings offer insights into characterizing electron rescattering dynamics.
This work advances the understanding of light-matter interactions at the attosecond scale.