Abstract:The high-order Laguerre-Gaussian (LG) mode output from an end-pumped Nd:YVO<sub>4</sub> laser cavity with strong spherical aberration (SA) induced by short-focal-length lens is studied in this work. A long-focal-length lens L1 is used in the cavity to expand and collimate the beam, so that the beam incident on another short-focal-length lens L2 in the cavity undergoes a strong SA. Since the ring-shaped LG modes with different values of angular index <i>m</i> have different beam radii, t… Show more
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