Spatiotemporal mode-locking: new route to high-power fiber lasers (Conference Presentation)

Frank W. Wise

doi:10.1117/12.2326807

11 October 2018 Spatiotemporal mode-locking: new route to high-power fiber lasers (Conference Presentation)

Frank W. Wise

Proceedings Volume 10797, Technologies for Optical Countermeasures XV; 1079706 (2018) https://doi.org/10.1117/12.2326807
Event: SPIE Security + Defence, 2018, Berlin, Germany

Abstract

Mode-locking of lasers has led to breakthroughs in numerous scientific fields and applications.Today, all mode-locked lasers are based on resonators that support a single transverse spatial mode. In the early days of laser development, locking of a few transverse and longitudinal modes of a laser was considered. In the intervening 50 years, almost no attention has been paid to locking of multiple transverse modes. In the past year, theoretical and experimental observations of locking of multiple transverse and longitudinal modes of a fiber laser have been reported. Strong spatial and spectral filtering in the laser underlie the formation of multimode ultrashort wave packets in the laser. Understanding of spatiotemporal mode-locking requires generalizing concepts from conventional 1-D mode-locking into higher dimensions: spatiotemporal dispersions (chromatic and modal dispersion) and saturable absorption, nonlinear coupling between spatiotemporal (3+1-D) modes, and spatiospectral filtering. Interactions between modes through linear and nonlinear coupling lead to shifts of the resonances, to yield states with long-range order. In the time domain, these mode-locked states correspond to coherent, spatiotemporal pulse trains. Several qualitatively-new types of mode-locking have been identified. Investigations of new 3D lasing states should be a fertile scientific direction. In addition, the peak power of spatiotemporally-mode-locked lasers scales by more than the mode area, which should lead to unprecedented performance from fiber lasers.

Conference Presentation

Citation Download Citation

Frank W. Wise "Spatiotemporal mode-locking: new route to high-power fiber lasers (Conference Presentation)", Proc. SPIE 10797, Technologies for Optical Countermeasures XV, 1079706 (11 October 2018); https://doi.org/10.1117/12.2326807

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KEYWORDS

Mode locking

High power fiber lasers

Fiber lasers

Laser resonators

Nonlinear filtering

Optical filters

Colorimetry

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