Narrow linewidth lasing in Nd:YVO4 disk laser with two-mirror cavity with M-type degenerate configuration

Single-frequency lasing was realized in the continuous-wave TEMoo Nd:YVO4 disk laser with the two-mirror plane-spherical resonator. The laser cavity had degenerate M-type configuration without any intracavity wavelength selectors. Spectral, energy, and spatial characteristics of the laser output were studied. Also, the reasons of single-frequency lasing existence were proposed.