Dual-wavelength vortex laser based on combined crystal

The invention provides a dual-wavelength vortex laser based on a combined crystal. The dual-wavelength vortex laser comprises a semiconductor laser pumping source, a collimating lens, a polarization splitting prism, a combined laser crystal, a laser resonant cavity mirror, a laser output coupling mirror and a double-color spectroscope, the semiconductor laser pumping source outputs a light beam with the intensity distributed in a hollow ring shape from an optical fiber after being specially coupled, the light beam is collimated into parallel light through a collimating lens and then enters a polarization splitting prism, and the polarization splitting prism divides non-polarization pumping light into two beams of transmitted horizontal polarized light and reflected vertical polarized light. A second half-wave plate is additionally arranged at any position between the first pump light reflecting mirror and the second pump light reflecting mirror to change the polarization direction of the pump light; the first