For coherent construction of the harmonic emission, the wave fronts of the fundamental laser and the generated harmonics must be in phase. Atoms along the path of the laser produce harmonics propagating with the laser field. When they are in phase with the laser wave front, there is constructive interference and these harmonics combine to build up the harmonic emission. The distance over which t..

High harmonic generation - WikipediaFrom Wikipedia, the free encyclopedia Laser science process 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 willen.wikipedia.org이 글에 대한 백그라운드 설명은 상기 위키디피아 링크를 참조해주세요. This is opposite to traditional optics theory in whi..