A unidirectional quantum cascade ring laser

Nshii, C. C.; Ironside, C. N.; Sorel, Marc; Slight, Thomas J.; Zhang, S. Y.; Revin, D. G.; Cockburn, J. W.

doi:10.1063/1.3524200

Cited by 16 publications

(11 citation statements)

References 8 publications

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“…in [13,20], a radically lower threshold for coherent multimode dynamics than what predicted by the Risken-Nummedal-Graham-Haken (RNGH) instability [28][29][30], which is typical of two-levels laser. In this regard, we observe that unidirectional lasing in ring cavities in QCLs has been demonstrated in both a monolithically integrated cavity and an external one [31,32]. Recently, in the latter configuration, working in both unidirectional and bi-directional emission regimes, the first experimental evidence of active mode-locking in QCLs has been reported [10].…”

Section: Introductionmentioning

confidence: 83%

Dynamics of a broad-band quantum cascade laser: from chaos to coherent dynamics and mode-locking

Columbo¹,

Barbieri²,

Sirtori³

et al. 2018

Opt. Express

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Abstract:The dynamics of a multimode Quantum Cascade Laser, is studied in a model based on effective semiconductor Maxwell-Bloch equations, encompassing key features for the radiationmedium interaction such as an asymmetric, frequency dependent, gain and refractive index as well as the phase-amplitude coupling provided by the Henry factor. By considering the role of the free spectral range and Henry factor, we develop criteria suitable to identify the conditions which allow to destabilize, close to threshold, the traveling wave emitted by the laser and lead to chaotic or regular multimode dynamics. In the latter case our simulations show that the field oscillations are associated to self-confined structures which travel along the laser cavity, bridging mode-locking and solitary wave propagation. In addition, we show how a RF modulation of the bias current leads to active mode-locking yielding high-contrast, picosecond pulses. Our results compare well with recent experiments on broad-band THz-QCLs and may help understanding the conditions for the generation of ultrashort pulses and comb operation in Mid-IR and THz spectral regions.

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Section: Introductionmentioning

confidence: 83%

Dynamics of a broad-band quantum cascade laser: from chaos to coherent dynamics and mode-locking

Columbo¹,

Barbieri²,

Sirtori³

et al. 2018

Opt. Express

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“…An erbium-doped fiber laser with a theta cavity providing a nearly 20 dB extinction ratio (ER) between output signals, propagating in favored and suppressed directions, was demonstrated 22 . This type of cavity was also used to realize highly unidirectional ring semiconductor lasers (ER of more than 20 dB) 23 , "quantum-dot-in-a-well" lasers (ER of 30 dB) 24 , and quantum cascade lasers (ER of approximately 10 dB) 25 .…”

Section: Introductionmentioning

confidence: 99%

Isolator-free unidirectional thulium-doped fiber laser

Kharitonov

Brès

2015

Light Sci Appl

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We report the first demonstration of a unidirectional, isolator-free 2-mm thulium-doped fiber (TDF) laser, relying on the properties of the theta cavity (ring resonator with S-shaped feedback). The core pumped theta cavity TDF laser provides sub-Watt output power with a slope efficiency of 25%, a 2 dB flat tuning range of 1900-2050 nm, and a linewidth of 0.2 nm, and achieves the extinction ratio of 18-25 dB (depending on the feedback value) between the favored and suppressed lasing directions. It is shown that these characteristics are competitive with, if not superior to, those of conventional ring cavities. The simulation results of the linear and Kerr-nonlinear theta cavities are also presented, explaining certain unexpected features of the laser behavior and establishing the importance of the doped fiber nonlinearity on the spectral shaping of the emitted signal.

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“…[15][16][17][18][19][20][21][22][23][24] For example, the application of a reflector at one side of the coupled bus waveguide in the circular cavity, 15 the triangular ring cavity with optical diode and taper waveguide, 16 theta cavity introduced fiber laser, 17 and the attach of S-shaped crossover waveguide [18][19][20] into the resonator are presented.…”

Section: Introductionmentioning

confidence: 99%

Selection of lasing direction in single mode semiconductor square ring cavities

Lee

Kim

Moon

et al. 2016

Journal of Applied Physics

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We propose and demonstrate a selection scheme of lasing direction by imposing a loss imbalance structure into the single mode square ring cavity. The control of the traveling direction is realized by introducing a taper-step section in one of the straight waveguides of the square ring cavity. It was shown by semi-analytic calculation that the taper-step section in the cavity provides effective loss imbalance between two travelling directions as the round trip repeats. Various kinds of square cavities were fabricated using InGaAsP/InGaAs multiple quantum well semiconductor materials in order to test the direction selectivity while maintaining the single mode. We also measured the pump power dependent lasing spectra to investigate the maintenance property of the lasing direction. The experimental results demonstrated that the proposed scheme is an efficient means for a unidirectional lasing in a single mode laser.

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A unidirectional quantum cascade ring laser

Cited by 16 publications

References 8 publications

Dynamics of a broad-band quantum cascade laser: from chaos to coherent dynamics and mode-locking

Dynamics of a broad-band quantum cascade laser: from chaos to coherent dynamics and mode-locking

Isolator-free unidirectional thulium-doped fiber laser

Selection of lasing direction in single mode semiconductor square ring cavities

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