Spatial structure of lasing modes in wave-chaotic semiconductor microcavities

Bittner, Stefan; Kim, Kyungduk; Zeng, Yongquan; Wang, Qi Jie; Cao, Hui

doi:10.1088/1367-2630/ab9e33

Cited by 19 publications

(15 citation statements)

References 61 publications

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“…Fig. S3(h)], leading to an exponential decay in time [44]. The fitted lifetimes τ as well as the corresponding quality factors Q ray for a L = 20 µm long cavity are given in Table S1 and show excellent agreement with the Q factors of the modes.…”

Section: B Ray Trajectories and Transverse Modesmentioning

confidence: 64%

Sensitive control of broad-area semiconductor lasers by cavity shape

Kim,

Bittner,

Jin

et al. 2022

Preprint

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The ray dynamics of optical cavities exhibits bifurcation points: special geometries at which ray trajectories switch abruptly between stable and unstable. A prominent example is the Fabry-Perot cavity with two planar mirrors, which is widely employed for broad-area semiconductor lasers. Such cavities support lasing in a relatively small number of transverse modes, and the laser is highly susceptible to filamentation and irregular pulsations. Here we demonstrate experimentally that a slight deviation from this bifurcation point (planar cavity) dramatically changes the laser performance. In a near-planar cavity with two concave mirrors, the number of transverse lasing modes increases drastically. While the spatial coherence of the laser emission is reduced, the output directionality remains relatively high. Moreover, the spatio-temporal lasing dynamics becomes significantly more stable compared to that in a Fabry-Perot cavity. Our near-planar broad-area semiconductor lasers, which produce a stable output beam with low spatial coherence and high directionality, will find applications in full-field speckle-free imaging, material processing and optical pumping. Furthermore, our method of controlling spatio-temporal dynamics with extreme sensitivity near a bifurcation point may be applied to other types of high-power lasers and nonlinear dynamic systems.

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Section: B Ray Trajectories and Transverse Modesmentioning

confidence: 64%

Sensitive control of broad-area semiconductor lasers by cavity shape

Kim,

Bittner,

Jin

et al. 2022

Preprint

Self Cite

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“…In a recent series of very interesting experiments [17] the emission at the boundary of a partially open BS following Fresnel laws has been studied both theoretically and experimentally. In order to compare with these experimental works, we take n = 3.3 (considered in [15]), which is approximately the experimental value and evaluate the same measures as before.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, we open the system by letting some trajectories escape according to both a completely projective and also an optical mechanism. The latter corresponds to one of the cavities used in very recent microlaser experiments [17]. The enhanced vision of POs and their associated homoclinic tangles provided by LDs for open maps allowed us to identify which of the shortest ones are responsible for the main properties of the emission in experimental situations.…”

Section: Introductionmentioning

confidence: 99%

Lagrangian descriptors for the Bunimovich stadium billiard

2022

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We apply the concept of Lagrangian descriptors to the dynamics on the Bunimovich stadium billiard, a twodimensional ergodic system with singular families of trajectories, namely, the bouncing ball and the whispering gallery orbits. They play a central role in structuring the phase space, which is unveiled here by means of the Lagrangian descriptors applied to the associated map on the boundary. More interestingly, we also consider the open stadium, which in the optical case (Fresnel's laws) can be directly related to recent microlaser experiments. We find that the structure of the emission profile of these systems can be easily described thanks to the open version of the Lagrangian descriptors.

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“…It was also unveiled that the ray-wave duality in microcavities provide new opportunities to study fundamental physical effects of wave chaos [121] and non-Hermitian physics [122], which was also recently applied to suppressing spatiotemporal instabilities of microlaser [123]. The ray-wave structured light in semiconductor laser was also used as a powerful tool to control complex coherent modes [124,125] and directional emission [126], enabling new applications in imaging and wavefront shaping [127].…”

Section: Localized Su(2) Geometric Microlaser Beamsmentioning

confidence: 99%

Rays, waves, SU(2) symmetry and geometry: toolkits for structured light

Shen

2021

J. Opt.

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Structured light refers to the ability to tailor optical patterns in all its degrees of freedom, from conventional 2D transverse patterns to exotic forms of 3D, 4D, and even higher-dimensional modes of light, which break fundamental paradigms and open new and exciting applications for both classical and quantum scenarios. The description of diverse degrees of freedom of light can be based on different interpretations, e.g. rays, waves, and quantum states, that are based on different assumptions and approximations. In particular, recent advances highlighted the exploiting of geometric transformation under general symmetry to reveal the ‘hidden’ degrees of freedom of light, allowing access to higher dimensional control of light. In this tutorial, I outline the basics of symmetry and geometry to describe light, starting from the basic mathematics and physics of SU(2) symmetry group, and then to the generation of complex states of light, leading to a deeper understanding of structured light with connections between rays and waves, quantum and classical. The recent explosion of related applications are reviewed, including advances in multi-particle optical tweezing, novel forms of topological photonics, high-capacity classical and quantum communications, and many others, that, finally, outline what the future might hold for this rapidly evolving field.

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Spatial structure of lasing modes in wave-chaotic semiconductor microcavities

Cited by 19 publications

References 61 publications

Sensitive control of broad-area semiconductor lasers by cavity shape

Sensitive control of broad-area semiconductor lasers by cavity shape

Lagrangian descriptors for the Bunimovich stadium billiard

Rays, waves, SU(2) symmetry and geometry: toolkits for structured light

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