Zur Theorie der Erzeugung der dritten optischen Harmonischen bei optimaler Fokussierung

The optical third harmonic generation of focused Gaussian light beams is studied theoretically in uniaxial crystals with third order non-linearity. The numerical integration of the parabolic equation for optimum focusing condition shows that, for strong focusing, the third harmonic power is independent of the focusing parameter=I/b (I=crystal length,b=confocal parameter). Therefore, the third harmonic generation differs from the second harmonic generation. We neglect in our calculations pump depletion and the intensity dependence of the refractive index.

---

---

Herrn V. Russu danke ich für Diskussionen. Frl. J. Bohn bin ich für die Durchführung der numerischen Rechnungen zu Dank verpflichtet.