J. A. Arnaud

BREVET

5 août 1969

ABSTRACT

Optical resonateors and regenarative laser amplifiers are disclosed. In all cases, the resonateors are made fully degenerate, in order to be useful in processing multiple modes or amplifying images. Full degeneracy is accomplished with relatively few lenses by inverting any bundle of resonated rays at planar reflectors. The resonators typically employ one or more rooftop reflectors or corner reflectors arranged to provide ray inversion.

LIEN VERS  L’ARTICLE : LASER AND OPTICAL RESONATORS WITH BEAM TWISTING

J. A. Arnaud, H. Kolgelnik

Applied Optics, Vol. 8, Issue 8, August 1969, pp. 1687-1693

ABSTRACT

This paper considers the propagation and diffraction of coherent light beams through nonorthogonal optical systems such as sequences of astigmatic lenses oriented at oblique angles to each other. The fundamental (gaussian) mode has elliptical light spots in each beam cross section and ellipsoidal (or hyperboloidal) wavefronts near the axis. It is found that the orientation of the light spot differs from that of the wavefront, and changes continuously by as much as π radians as the beam propagates through free space. A theory of these general astigmatic beams is given and simple experimental observations are described. The coupling factor between two such beams is also given.

LIEN VERS  L’ARTICLE : GAUSSIAN LIGHT BEAMS WITH GENERAL ASTIGMATISM