Related Experiment Video
Updated: Aug 10, 2026
12:14
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
Observation of phase-matched relativistic harmonic generation
Chen1, Maksimchuk, Esarey
1Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109, USA.
Physical Review Letters
|September 16, 2000
Summary
Researchers achieved phase-matched relativistic harmonic generation in plasmas for the first time. This novel technique produced third-harmonic light, showing potential for advanced laser-plasma interactions.
Area of Science:
- Plasma Physics
- Nonlinear Optics
- Laser-Matter Interactions
Background:
- Harmonic generation in plasmas is a key process for frequency upconversion.
- Achieving phase matching is crucial for efficient high-harmonic generation.
Purpose of the Study:
- To observe and characterize phase-matched relativistic harmonic generation in plasmas.
- To investigate the properties of third-harmonic light generated through this process.
Main Methods:
- Experimental observation of third-harmonic light generation in plasmas.
- Spectral and angular discrimination from competing processes.
- Analysis of the angular emission pattern.
Main Results:
- First observation of phase-matched relativistic harmonic generation in plasmas.
- Third-harmonic light detected with a narrow forward-directed angular pattern.
- Signal levels comparable for circularly and linearly polarized pump pulses.
Conclusions:
- Phase matching of high-order transverse modes in plasmas enables efficient harmonic generation.
- The observed phenomenon has implications for advanced laser-plasma applications.
- Polarization of the pump pulse has a similar effect on signal strength.
Related Concept Videos
02:39Emission Spectra
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
02:32The de Broglie Wavelength
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
01:11Atomic Nuclei: Larmor Precession Frequency
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
01:10Generating 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...
01:30Plane Electromagnetic Waves I
The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
The EM field is assumed to be a...
The EM field is assumed to be a...
01:29Plane Electromagnetic Waves II
Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.