Colliding Pulse Mode Locking and Nonequilibrium Carrier Dynamics within Vertical External-Cavity Surface-Emitting Lasers

Author
McLaren, S.A.
Kilen, Isak Ragnvald
Moloney, J.V.
Date Issued
2022-08-02
Keywords
Lasere
Faststofflaser
Numerisk analyse
Modellering
Permalink
http://hdl.handle.net/20.500.12242/3105
DOI
10.1103/PhysRevApplied.18.024006
Collection
Articles
Description
McLaren, S.A.; Kilen, Isak Ragnvald; Moloney, J.V.. Colliding Pulse Mode Locking and Nonequilibrium Carrier Dynamics within Vertical External-Cavity Surface-Emitting Lasers. Physical Review Applied 2022 ;Volum 18.(2) s. 1-13
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Abstract
The complex nonlinear dynamics of colliding counterpropagating ultrashort laser pulses circulating in a vertical external-cavity surface-emitting ring laser cavity are captured by a first-principles quantum-mechanical microscopic model coupled to an intracavity beam propagator. Our numerical simulations establish that overall mode locking stability is sensitive to relative phases and delays of the pulses impinging on the semiconductor saturable absorber mirror. Delay offsets of the counterpropagating pulses lead to asymmetric carrier recovery and instability, often leading in turn to single unidirectional circulating pulses. Although computationally challenging, we also include transverse effects and show that the influence of interference patterns from spatial gratings written by the counterpropagating pulses is significant in stabilizing the modelocked pulses.
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