Integrated pulse scope for tunable generation and intrinsic characterization of structured femtosecond laser

Abstract

Numerous techniques have been demonstrated for effective generation of orbital angular momentum-carrying radiation, but intracavity generation of continuously tunable pulses in the femtosecond regime remains challenging. Even if such a creation was realized, the generated pulses, like all pulses in reality, are complex and transitory objects that can only be comprehensively characterized via multidimensional spaces. An integrated lasing system that generates pulses while simultaneously quantifies them can achieve adaptive pulse tailoring. Here, we report a femtosecond pulse scope that unifies vector vortex mode-locked lasing and vectorial quantification. With intracavity-controlled Pancharatnam-Berry phase modulation, continuous and ergodic generation of spirally polarized states along a broadband higher-order Poincare sphere was realized. By intrinsically coupling a two-dimensional polarization-sensitive time-scanning interferometer to the laser, multidimensional spatiotemporal features of the pulse were further visualized. The proposed methodology paves the way for design optimization of ultrafast optics by integrating complex femtosecond pulse generation and structural customization, facilitating its applications in optical physics research and laser-based manufacturing.

arXiv comment36 pages, 32 figures

References in corpus (6)

• Entanglement of Orbital Angular Momentum States of Photons
• Optical spin-to-orbital angular momentum conversion in inhomogeneous anisotropic media
• Optical alignment and spinning of laser-trapped microscopic particles
• Polarization pattern of vector vortex beams generated by $q$-plates with different topological charges
• Object Identification Using Correlated Orbital Angular Momentum States
• Controlled generation of ultrafast vector vortex beams from a mode-locked fiber laser