Modes of a plano – spherical laser resonator with the Gaussian gain distribution of the active medium

CW TEM00 spectral narrow band Nd:YVO4 disk laser with two-mirror degenerate cavity configuration

“…The geometric modes implementation does not require the use of multi-beam pumping [8,9,11,12] for sure. In our experiments we used the cases with single-beam (spot S1) and twobeams (spots S1, S2 or S1, S3) pumping also.…”

“…An additional interest in the study of the spectral properties of lasers with degenerate cavity configurations is caused by the fact that lower order modes are excited with the largest weight in these resonators when the Gaussian beams are used for pumping of an active medium [4,8,9].…”

Single-frequency lasing in a CW TEМ00 Nd:YVO4 disk laser with an M-type degenerate cavity and three-beam pumping

“…It also led to optical power reduction of the thermally induced lens, which significantly influenced radiation propagation in the resonator, especially in the S3 spot area (figure 2), where the radiation enters at an angle in both directions. Also, it should be noted that in degenerate cavities with Gaussian diaphragms (Gaussian pump profile in our case), the probability of TEM 00 operation remains high, even when the pumping spots significantly exceed the size of the main transverse mode (up to 2-3 times) [16,17].…”

Geometric ring mode in a linear cavity

“…In lasers, offaxis folder laser beam trajectories with W and M modes were reported in CO 2 lasers with hemiconfocal cavity configurations [4]. In end-pumped lasers, off-axis pumping is a usual technique to excite the geometric modes for mode-degenerate cavity configurations [5][6][7] and theoretical analyses have been proposed [8,9]. In practice, an axially pumped laser can support off-axis beams in a plane-concave cavity when the cavity length is adjusted within a region close to the hemispherical cavity configuration [10].…”