Abstract
In a laser resonator operating with many transverse modes, the divergence of the emerging beam is relatively high, resulting in a high M2 value. To reduce the divergence, it is best to reduce the number of the modes, preferably to a single mode. Typically, this is achieved by introducing an aperture inside the cavity, so the laser resonator will operate with a single TEM00 mode. Unfortunately, this results in a significant reduction of the output power, since only a small volume of the gain medium is exploited.
© 1998 IEEE
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