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-order harmonics of the generation beam (above the fifth harmonic).
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-order harmonics of the generation beam (above the fifth harmonic).
Source: Wikipedia "High harmonic generation" · CC BY-SA 4.0
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