Computer Science
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995spie.2502...96a&link_type=abstract
Proc. SPIE Vol. 2502, p. 96-100, Gas Flow and Chemical Lasers: Tenth International Symposium, Willy L. Bohn; Helmut Huegel; Eds.
Computer Science
Scientific paper
The properties and possible application fields of several comparatively new types of resonators are discussed. Among them are: (1) Unstable resonator with semi-transparent output mirror. This scheme provides an increase in axial luminous intensity. (2) Half-confocal stable resonator with diffraction output coupling. This resonator comprises a big concave and a little plane mirrors; its properties are similar to those of an unstable resonator with spatial filtration (SFUR) proposed by Gobbi et al, but the half-confocal resonator is simpler and more convenient. (3) Multipass unstable resonator of high stability with regard to misalignments. This resonator consists only of large curvature concave mirrors and has the axis position stability by two-three orders better than the conventional arrangements. Resonator comprises a Sagnac interferometer with splitting into two beams rotating in mutually opposite directions, which has low sensitivity with regard to azimuthal inhomogeneities. The possibility of designing a Sagnac interferometer made up only of non-transparent mirrors is discussed. (5) Resonator with high effective length based on an astigmatic telescope transforming the annular into rectangular beam cross section. This scheme is perhaps one of the best for lasers with annular cross section of the active medium.
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