Focusing large-aperture beams generated by high-peak-power lasers

• Autorzy: Jabłoński S. , Badziak J.
• Języki publikacji: EN

Abstrakty

EN

The properties of focusing large-aperture fight beams of parameters typical of the beams produced by picosecond terawatt lasers are analysed numerically with the use of 3-D computer code based on Fresnel-Kirchhoff integral formula. It is shown that, contrary to the case of small-aperture Gaussian-like beams, a peak intensity of light in the focus is a non-monotonic function of f/D with a local maximum at moderate f/D values (5 [left angle bracket]or= f/D [left angle bracket]or= 10), where f is the focal length and D is the aperture of a focusing system. For low f/D values (f/D [left angle bracket] 3) more than 80% of laser energy is scattered after focusing in a low-intensity large-dimension aureole round the central peak of focal intensity distribution. The amount of the scattered energy can be significantly decreased by an increase of f/D, and, as a result, the moderate values of this ratio seem to be optimum for most laser-target experiments. The above features appear for both spherical and aspherical focusing systems.

Słowa kluczowe

EN

aberrations; integral equations; laser beams; lenses; light scattering; mirrors; optical focusing

PL

równanie całkowe; aberracja; soczewka; laser; ZWIERCIADŁA; OGNISKOWANIE; wiązka laserowa

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Optica Applicata
• Rocznik: 2001
• Tom: Vol. 31, nr 3
• Strony: 625--634
• Opis fizyczny: bibliogr. 13 poz.

Twórcy

autor

Jabłoński S.

autor

Badziak J.

• Institute of Plasma Physics and Laser Microfusion, ul. Hery 23, 00-908 Warszawa