High harmonic generation
Laser science process / From Wikipedia, the free encyclopedia
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For generation of the fourth and lower harmonics, see harmonic generation.
High-harmonic generation (HHG) is a non-linear process during which a target (gas, plasma, solid or liquid sample) is illuminated by an intense laser pulse. Under such conditions, the sample will emit the high harmonics of the generation beam (above the fifth harmonic). Due to the coherent nature of the process, high-harmonics generation is a prerequisite of attosecond physics.