Abstract
A general review of the laser resonator, characterized by its g parameters, is presented. The stable configurations with one and two active media are considered. The laser rod is considered as a thick lens, with refractive power that depends on the pumping level. For the one-rod resonator, fundamental mode operation can be performed in two stability zones. These zones are symmetrical and have the same width as a function of the refractive power of the rod. For a resonator with two rods inside, equal and different refractive powers of the rod at the same pump level are considered. By means of the g parameters and the resonator matrix method, beam characteristics such as the spot size on the mir- rors, divergence, beam waists and the positions of the beam waists, and the fundamental mode volume into the rod are described. To obtain fun- damental mode operation, plane-plane and convex-concave resonators with one and two Nd:YAG active media are experimentally investigated. The results for energy, beam quality, and divergence are presented. © 1996 Society of Photo-Optical Instrumentation Engineers.
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