Tunable multi-structured-beam optical parametric oscillator

The recent advances in the field of spatial engineering of coherent sources have opened up wide interest for utility in new application areas. Among various structured beams, optical vortices [1] and Airy beams [2] have proved useful in a variety of applications including quantum information and communication, material lithography, micro particle manipulation and light sheet microscopy. Typically, such beams are generated through spatial modulation of Gaussian laser beams. Since the generation of vortex and Airy beams requires different spatial phase modulation techniques, such beams are generated in separate experimental schemes. Here, we report a novel experimental scheme for simultaneous generation of various types of structured beams including Gaussian, vortex, Airy, and vortex Airy beams, which are also tunable across a broad wavelength range by using an optical parametric oscillator (OPO) in singly resonant oscillator (SRO) configuration.