Papers & References

Spatiotemporal flat-top beam generated from an all-fiber mode-locking laser

PLUTO / PLUTO-2 Spatial Light Modulators
Beam Shaping / Beam Steering Higher Order Modes / Optical Vortex / OAM
Published on:
Authors: Rufei Long, Jiahao Wen, Yongle Li, Lihan Huang, Dianyuan Fan, Guobao Jiang, and Yu Chen
Abstract:

The flat-top beams have significant potential for applications in micromachining and biomedicine, due to their unique intensity distribution. Therefore, spatiotemporal flat-top beams, which are all flat-top in both spatial and time domains, may significantly advance its development. Here, we demonstrate the generation of a spatiotemporal flat-top beam using an all-fiber mode-locked laser. Using nonlinear optical loop mirror (NOLM) technology, stable dissipative soliton resonance (DSR) pulses with flat-top shapes in the time domain are obtained. By superimposing the two flat-top pulses (LP01 and VBs) with the orthogonal polarization method, a pulsed spatiotemporal flat-top beam with a flat center and steep edge in both spatial and time domains can be realized. Additionally, the duration of the obtained spatiotemporal flat-top beam can be tuned from 1.8 ns to 12.6 ns, while the spatial intensity distribution remains unchanged. Our finding provides an effective way to generate spatiotemporal flat-top beams in an all-fiber mode-locking laser, which may have significant potential applications in many fields, particularly in laser micromachining.

Open Access

Publication: Optics Express
Issue/Year: Opt. Express 33, 583-591 (2025)
DOI: 10.1364/OE.547488
Link: https://doi.org/10.1364/OE.547488
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