The invention discloses a 0.9-mu m
laser device for a double-end polarization pump. A
laser diode pump source emits pump light, the pump light is emitted by an energy-transmitting
optical fiber and collimated into parallel light to enter a polarization splitting
prism, the polarization splitting
prism splits the unpolarized pump light in a horizontal polarization direction and a vertical polarization direction, the pump light in the horizontal polarization direction directly passes through the polarization splitting
prism, and the pump light in the vertical polarization direction is reflected; the pump light which is in the horizontal polarization direction and directly passes through the polarization splitting prism is changed to be in the vertical polarization direction and then enters a
laser crystal as pi-polarized light under the action of a half-wave plate arranged in any position between the polarization splitting prism and the laser
crystal; the reflected pump light in the vertical polarization direction is focused by
coupling lenses to pass through the pump laser beam as pi-polarized light; the laser
crystal is subjected to
population inversion under the effect of the pump, 914-nm
laser oscillation is produced under the
feedback effect of a laser device
resonant cavity consisting of a laser reflection mirror and a laser outputting mirror, and 914-nm laser output is obtained through emission by a spectroscope after
coupling and outputting by the laser outputting mirror.