Multipulse instabilities of a femtosecond SESAM-modelocked VECSEL

Waldburger, Dominik; Alfieri, C. G. E.; Link, Sandro M.; Meinecke, Stefan; Jaurigue, Lina; Lüdge, Kathy; Keller, U.

doi:10.1364/oe.26.021872

Cited by 18 publications

(31 citation statements)

References 42 publications

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“…6). Similar pulse emission was also found in a two-section quantum well based mode locked laser 52 and in V-shaped external cavities 53 . They are found at pump currents above P ≈ 1.1A for SA starting positions between mm and mm.…”

Section: Resultssupporting

confidence: 74%

Ultra-Short Pulse Generation in a Three Section Tapered Passively Mode-Locked Quantum-Dot Semiconductor Laser

Meinecke

Drzewietzki

Weber

et al. 2019

Sci Rep

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We experimentally and theoretically investigate the pulsed emission dynamics of a three section tapered semiconductor quantum dot laser. The laser output is characterized in terms of peak power, pulse width, timing jitter and amplitude stability and a range of outstanding pulse performance is found. A cascade of dynamic operating regimes is identified and comprehensively investigated. We propose a microscopically motivated traveling-wave model, which optimizes the computation time and naturally allows insights into the internal carrier dynamics. The model excellently reproduces the measured results and is further used to study the pulse-generation mechanism as well as the influence of the geometric design on the pulsed emission. We identify a pulse shortening mechanism responsible for the device performance, that is unique to the device geometry and configuration. The results may serve as future guidelines for the design of monolithic high-power passively mode-locked quantum dot semiconductor lasers.

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Section: Resultssupporting

confidence: 74%

Ultra-Short Pulse Generation in a Three Section Tapered Passively Mode-Locked Quantum-Dot Semiconductor Laser

Meinecke

Drzewietzki

Weber

et al. 2019

Sci Rep

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“…As in the experimental realization in [7,8], we model our system with the delay differential equations (DDEs) Gain Absorber Output coupler Electric field FIG. 1.…”

Section: Emergence Of Lssmentioning

confidence: 99%

“…This paper focuses on the dynamics of temporal LSs found in VECSELs arranged in a V-shaped cavity configuration [7][8][9][10]. At variance with previous works that employed linear cavities, the gain chip in the case of the Vshaped configuration is positioned between the absorber and the output mirror.…”

Section: Introductionmentioning

confidence: 99%

Phase incoherent photonic molecules in V-shaped mode-locked VECSELs

Hausen,

Meineck,

Javaloyes

et al. 2020

Preprint

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Passively mode-locked vertical external-cavity surface-emitting semiconductor lasers (VECSELs) composed of a gain chip and a semiconductor saturable absorber have been drawing much attention due to their excellent performance figures. In this work we investigate how localized structures and incoherent, non-locally bound, pulse molecules emerge in a long cavity VECSELs using a V-shaped cavity geometry. We show that these states are bistable with the laser off state and that they are individually addressable. Using a model based upon delay differential equations, we demonstrate that pulse clusters result from the cavity geometry and from the non-local coupling with the gain medium; this leads to locally independent, yet globally bound phase, incoherent photonic molecules. Using a multiple time-scale analysis, we derive an amplitude equation for the field that allows us to predict analytically the distance between the elements of a cluster.

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“…For the carriers in the VECSEL gain cavity we have the rate equation identical to (20); however, the intensity in the cavity is now due to propagation in both directions. In the plane wave approximation, and, as in [23,24], assuming in this study the incoherent addition of the counter propagating signals (applicable given a wide enough aperture), then the intensity within a thin resonantly positioned gain layer is:Sg≈|1+roti|2(|Ercfalse(g→afalse)|2+|Ercfalse(g→mfalse)|2)…”

Section: Vecsel–sesam In a Folded Geometrymentioning

confidence: 99%

“…This allows a possibility to substantially enhance computational efficiency, by narrowing the temporal window when simulating the pronounced Mode Locking (ML) regime [22]. In recent papers [23,24], a version of a delay-differential model was developed taking into account the folded, as well as simple linear, cavity geometries. These papers centred on lasers designed for ultrashort pulse generation, and were mainly dedicated to the issue of multiple pulse (pulse molecule) generation as observed under some operating conditions in such lasers; therefore the gain chip and saturable absorber were treated essentially as short travelling-wave amplifiers, ignoring their reflective nature and resonator properties (indeed, for femtosecond pulse generation it is beneficial to suppress the resonator properties of the chips by applying antireflection coatings, to minimise any narrowing of the emission spectra).…”

Section: Introductionmentioning

confidence: 99%