As other semiconductor lasers, concentric-circle-grating, surface-emitting lasers are compact, light, and efficient. However, unlike other semiconductor lasers, they emit high-power, low-divergence azimuthally polarized <i>J</i><sub>1</sub> Bessel–Gaussian beams. Because of their azimuthal polarization, they have a null at the center of the beam that makes them undesirable for certain applications. Binary phase compensation, a lossless technique previously used to improve the far-field profile of linearly polarized Hermite–Gaussian beams, is adapted to these azimuthally polarized beams to rid them of their axial nulls and improve their beam profile.
© 1998 Optical Society of America
Anthony A. Tovar, "Phase Compensation of Azimuthally Polarized J1 Bessel-Gaussian Laser Beams," Appl. Opt. 37, 540-545 (1998)