Serna Galán, JulioMartínez, C.Encinas Sanz, FernandoMartínez Herrero, María RosarioMejías Arias, Pedro Miguel2023-06-202023-06-201998-100018-919710.1109/3.720215https://hdl.handle.net/20.500.14352/58594©1998 IEEE-Inst Electrical Electronics Engineers Inc.The time evolution of the transversal modes in a TEA CO_2 laser cavity has been investigated from the analysis of the time-varying beam quality factor M^2 of the emitted pulses. The experiments reveal a significant change in this parameter during the pulse evolution, which can be translated into an evolution of the modes of the laser cavity to reach a nearly stationary behavior. Attention is focused on both the appearance of a particular mode and the duration of its growing process.engjournal articlehttp://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=720215http://ieeexplore.ieee.orgopen access535Parametric CharacterizationOptical-SystemsLightLawsÓptica (Física)2209.19 Óptica Física