LG₁₁-mode vortex Nd:YAG laser by applying second-order circular Dammann grating for annular pumping

【摘要】 The excitation of high-order Laguerre–Gaussian（LG） modes in a neodymium-doped yttrium aluminum garnet（Nd:YAG） laser resonator was presented by applying the diffraction of a second-order circular Dammann grating（CDG） for annular pumping. In the study, the 808 nm pump light was shaped into a double-ring structure by the CDG and matched spatially with that of an ideal LG₁₁ mode. As a result, the laser resonator generated an LG₁₁ vortex mode, and the laser power reached 204 mW with 14.5% slope efficiency. Also, when the cavity mirror was tilted, the laser output could switch to the LG01 vortex mode. The results showed the convenience and versatility of CDG in an annular-pumped vortex laser.更多还原

【Abstract】 The excitation of high-order Laguerre–Gaussian（LG） modes in a neodymium-doped yttrium aluminum garnet（Nd:YAG） laser resonator was presented by applying the diffraction of a second-order circular Dammann grating（CDG） for annular pumping. In the study, the 808 nm pump light was shaped into a double-ring structure by the CDG and matched spatially with that of an ideal LG₁₁ mode. As a result, the laser resonator generated an LG₁₁ vortex mode, and the laser power reached 204 mW with 14.5% slope efficiency. Also, when the cavity mirror was tilted, the laser output could switch to the LG01 vortex mode. The results showed the convenience and versatility of CDG in an annular-pumped vortex laser.更多还原