Chaotic light at mid-infrared wavelength

Jumpertz, Louise; Schires, Kevin; Carras, Mathieu; Sciamanna, Marc; Grillot, Frédéric

doi:10.1038/lsa.2016.88

Cited by 74 publications

(81 citation statements)

References 54 publications

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“…The LFFs and CC regimes have been known for decades and their dynamical origin and statistical properties have been intensively studied202122232425262728293031323334353637383940414243444546474849505152535455565758. However, to the best of our knowledge, the transition points from noisy emission to LFFs, and from LFFs to CC, occurring as the pump current increases, have not yet been quantified.…”

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confidence: 99%

Quantitative identification of dynamical transitions in a semiconductor laser with optical feedback

Quintero-Quiroz

Tiana-Alsina

Romà

et al. 2016

Sci Rep

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Identifying transitions to complex dynamical regimes is a fundamental open problem with many practical applications. Semi- conductor lasers with optical feedback are excellent testbeds for studying such transitions, as they can generate a rich variety of output signals. Here we apply three analysis tools to quantify various aspects of the dynamical transitions that occur as the laser pump current increases. These tools allow to quantitatively detect the onset of two different regimes, low-frequency fluctuations and coherence collapse, and can be used for identifying the operating conditions that result in specific dynamical properties of the laser output. These tools can also be valuable for analyzing regime transitions in other complex systems.

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confidence: 99%

Quantitative identification of dynamical transitions in a semiconductor laser with optical feedback

Quintero-Quiroz

Tiana-Alsina

Romà

et al. 2016

Sci Rep

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“…In the case of self-mixing interferometry, the feedback must be in the order of 10 −6 at maximum 20 because otherwise, the self-mixing pattern is combined with non-linear dynamics such as oscillations and low frequency fluctuations (LFF). 11 A beam splitter with high reflection and low transmission is inserted between the feedback mirror and the QCL. The reflected light is analyzed through either a Mercury-Cadmium-Telluride (MCT) detector with a bandwidth of 50 MHz (Kolmar KMPV50 0.5 J2) for self-mixing interferometry or a Fourier transform infrared spectrometer (Bruker Vertex 80V) for the Hakki-Paoli method (and in that case, the feedback mirror is hidden).…”

Section: Device Description and Experimental Apparatusmentioning

confidence: 99%

“…19,28 However, the lack of bifurcation is not compatible with experimental studies where the QCL is under conventional optical feedback. 10,11 Figure 2 (b) shows the bifurcation diagram when the LEF is 1.5 and the other parameters remain constant. The output of the laser is constant until the feedback strength reaches 29%.…”

Section: Modellingmentioning

confidence: 99%

Extensive study of the linewidth enhancement factor of a distributed feedback quantum cascade laser at ultra-low temperature

Spitz

Herdt

Duan

et al. 2019

Quantum Sensing and Nano Electronics and Photonics XVI

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Quantum cascade lasers (QCLs) are optical sources exploiting radiative intersubband transitions within the conduction band of semiconductor heterostructures. 1 The opportunity given by the broad span of wavelengths that QCLs can achieve, from mid-infrared to terahertz, leads to a wide number of applications such as absorption spectroscopy, optical countermeasures and free-space communications requiring stable single-mode operation with a narrow linewidth and high output power. 2 One of the parameters of paramount importance for studying the high-speed and nonlinear dynamical properties of QCLs is the linewidth enhancement factor (LEF). The LEF quantifies the coupling between the gain and the refractive index of the QCL or, in a similar manner, the coupling between the phase and the amplitude of the electrical field. 3 Prior work focused on experimental studies of the LEF for pump currents above threshold but without exceeding 12% of the threshold current at 283K 4 and 56% of the threshold current at 82K. 5 In this work, we use the Hakki-Paoli method 6 to retrieve the LEF for current biases below threshold. We complement our findings using the self-mixing interferometry technique 5 to obtain LEFs for current biases up to more than 100% of the threshold current. These insets are meaningful to understand the behavior of QCLs, which exhibit a strongly temperature sensitive chaotic bubble when subject to external optical feedback. 7

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“…7 Furthermore, chaotic emission from a QCL under optical feedback has recently been evidenced. 8 to quantify the optical feedback originating from a mid-IR fiber to know how much a QCL operation will differ between free-space and fibered characterizations. Optical feedback is known to have a significant impact on the laser threshold.…”

confidence: 99%

“…7 The unstable regime was furthermore proven to correspond to a temporal chaos. 8 The amount of feedback necessary to destabilize the QCL varies strongly depending on the laser characteristics, including the active material and its design or dimensions. For the specific QCL considered here, based on an analysis of the feedback regimes from the optical spectra, chaotic operation is observed for feedback ratios between 18% and 24%.…”

confidence: 99%

Estimating optical feedback from a chalcogenide fiber in mid-infrared quantum cascade lasers

Jumpertz

Caillaud

Gilles³

et al. 2016

AIP Advances

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International audienceThe amount of optical feedback originating from a chalcogenide fiber used to couple light from a mid-infrared quantum cascade laser is evaluated experimentally. Threshold reduction measurements on the fibered laser, combined with an analytical study of a rate equations model of the laser under optical feedback, allow estimating the feedback strength between 11% and 15% depending on the fiber cleavage quality. While this remains below the frontier of the chaotic regime, it is sufficient to deeply modify the optical spectrum of a quantum cascade laser. Hence for applications such as gas spectroscopy, where the shape of the optical spectrum is of prime importance, the use of mid-infrared optical isolators may be necessary for fibered quantum cascade lasers to be fully exploited. © 2016 Author(s)

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Chaotic light at mid-infrared wavelength

Cited by 74 publications

References 54 publications

Quantitative identification of dynamical transitions in a semiconductor laser with optical feedback

Quantitative identification of dynamical transitions in a semiconductor laser with optical feedback

Extensive study of the linewidth enhancement factor of a distributed feedback quantum cascade laser at ultra-low temperature

Estimating optical feedback from a chalcogenide fiber in mid-infrared quantum cascade lasers

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