Self-sustaining azimuthal polarization in a passively Q-switched Nd:GdVO_4 laser with a Cr^4+:YAG saturable absorber

Azimuthally polarized, passively Q-switched Yb-doped fiber laser

“…Previously, the pulsed and CV beam was mainly generated from the solid-state laser [4,[8][9][10][11][12][13][14][15]. In such laser, the route to pulsed operation usually mentions the utilization of Q-switched or modelocked techniques, while the vectorized oscillation involves the introduction of an axis-symmetrical polarization selector [8][9][10][11][12][13] or thermally induced birefringence [4,14,15] into the resonator.…”

“…In such laser, the route to pulsed operation usually mentions the utilization of Q-switched or modelocked techniques, while the vectorized oscillation involves the introduction of an axis-symmetrical polarization selector [8][9][10][11][12][13] or thermally induced birefringence [4,14,15] into the resonator. Compared with solid-state laser sources, the rare-earth doped fiber laser has been paid much attention owing to its capacities for power scaling, thermal dissipation and modal confinement.…”

Pulsed azimuthally polarized beam from passively Q-switched rotating Nd:YAG disk laser

“…The pulsed operation of vector polarization has been implemented previously by D. Pohl in a passively Q-switched ruby laser. 14) Recently, the azimuthal or radial polarization pulse was generated mainly from solid-state lasers by utilizing active or passive Q-switching, [15][16][17][18][19] or mode locking. [20][21][22] However, for a laser resonator working the thermal lens effect in bulk gain material restricts the extraction of stored energy.…”

Q-switched mode-locked and azimuthally polarized Nd:GdVO4 laser with semiconductor saturable absorber mirror

“…6) Practically, active-type CV beams can be generated directly from a laser if the laser crystal offers a mechanism for distinguishing the ordinary ray (o-ray) and extraordinary ray (e-ray). [7][8][9][10][11] Because birefringence leads to the optical path difference between the o-and e-rays, one ray survives the edge of the stable region and generates corresponding CV beams. [7][8][9] Radially and azimuthally polarized beams can be generated through the thermally induced birefringence and thermal lensing of a Nd:YAG laser rod.…”

“…[7][8][9][10][11] Because birefringence leads to the optical path difference between the o-and e-rays, one ray survives the edge of the stable region and generates corresponding CV beams. [7][8][9] Radially and azimuthally polarized beams can be generated through the thermally induced birefringence and thermal lensing of a Nd:YAG laser rod. 7,10) Moreover, shaping the pump profile can excite the radially polarized beam in a microchip Nd:YVO 4 laser 11) and the vector Bessel-Gaussian beam in a c-cut Nd:YVO 4 laser.…”