Experimental study of the delayed threshold phenomenon in a class-A VECSEL

Amili, Abdelkrim El; Gredat, Grégory; Alouini, Mehdi; Sagnes, I.; Bretenaker, Fabien

doi:10.1051/epjap/2012120070

Cited by 5 publications

(3 citation statements)

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“…In a laser, the bifurcation point corresponds to the lasing threshold and DTP manifests itself in the form of a jump in the output intensity when the pump intensity is swept across threshold. Such phenomenon has been previously observed in macroscopic lasers (31)(32)(33). Fig.…”

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confidence: 74%

“…4C, D, E. This is consistent with the fact that the time delay associated with DTP reduces as the first derivative of the pump pulse increases proportionally to the peak pump power (see Fig. S1-S3) (25,(29)(30)(31)(32)(33). Additionally, as the pump pulse stays above threshold for a longer period of time, the device stays lasing for longer and the photon decay on the right-hand side of the output pulse happens at a later time.…”

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confidence: 82%

“…Therefore, no sudden change in intensity is observed on the right-hand side of the output pulse. This asymmetry between the response of the laser when the pump is swept from below to above threshold and vice versa is often termed as dynamical hysteresis in the literature (29)(30)33).…”

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Dynamic hysteresis in a coherent high-β nanolaser

Pan¹,

Gu²,

Amili³

et al. 2016

Optica

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The quest for an integrated light source that promises high energy efficiency and fast modulation for high-performance photonic circuits has led to the development of roomtemperature telecom-wavelength nanoscale laser with high spontaneous emission factors, β. The coherence characterization of this type of lasers is inherently difficult with the conventional measurement of output light intensity versus input pump intensity due to the diminishing kink in the measurement curve. We demonstrate the transition from chaotic to coherent emission of a high-β pulse-pump metallo-dielectric nanolaser can be determined by examining the width of a second order intensity correlation, ) ( 2  g , peak, which shrinks below and broadens above threshold. Photon fluctuation study, first one ever reported for this type of nanolaser, confirms the validity of this measurement technique. Additionally, we show that the width variation above threshold results from the delayed threshold phenomenon, providing the first indirect observation of dynamical hysteresis in a nanolaser. Main Text:Nanocavity lasers with high spontaneous emission factors, β, have attracted considerable attention in the past decade in light of their technical applications ranging from optical interconnects (1), bio-sensing (2), chemical detection (3) and nonlinear optical microscopy (4) to fundamental research on thresholdless lasers (5-8) and cavity quantum electrodynamics (9-10).Theoretically a high-β nanolaser is more energy efficient as most spontaneous emission is funneled into the lasing mode, resulting in an extremely low lasing threshold (5). Additionally,

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confidence: 82%