The development and testing of a continuous garnet laser with a length of multimode quartz lightguide in its resonator is reported. Optimum conditions for excitation of various transverse modes in a laser with a lightguide resonator are calculated. It is established that strong transverse - index mode selection occurs in the lightguide resonator. It is shown experimentally that small changes in the configuration of the resonator can be made to tune the laser from one transverse mode to another. A single-mode regime corresponding to the selected lightguide mode is then excited in the multimode fiber. The calculated and experimental results indicate that incorporation of a lightguide into a laser resonator is an effective way to excite a single lightguide mode in a multimode fiber.
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