Single-mode quantum cascade lasers employing a candy-cane shaped monolithic coupled cavity

Liu, Peter Q.; Sladek, Kamil; Wang, Xiaojun; Fan, Jen-Yu; Gmachl, Claire F.

doi:10.1063/1.3664117

Cited by 18 publications

(14 citation statements)

References 17 publications

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“…In summary, we have shown that for two coupled cavities of different FSRs, the overlapping of their resonances do not typically favor lasing, resulting in an inverse Vernier effect. The suppression of these overlapping resonances can also lead to an increased FSR and possibly singlemode lasing, as found in previously experiments [4][5][6][7][8].…”

Section: Discussionsupporting

confidence: 75%

“…The only differences are: (i) a different β factor is needed to capture the phase and amplitude change of the light after a round trip in the slab cavity, including the effect of the radiation loss through the end facets; and (ii) the clockwise and counterclockwise waves in the micro-ring/micro-disk cavity are coupled by a slab resonance. More specifically, the equivalence of the threshold condition (5) or (6) is…”

Section: Discussionmentioning

confidence: 99%

“…Since the increased FSR and single-mode lasing reported in Refs. [4][5][6][7][8] were observed close to the lowest lasing threshold, nonlinearity was not crucial for these observation and we neglect it in the analysis below. We first consider two coupled micro-ring cavities (see Fig.…”

Section: Introductionmentioning

confidence: 99%

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Inverse Vernier effect in coupled lasers

Türeci

2015

Phys. Rev. A

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In this report we study the Vernier effect in coupled laser systems consisting of two cavities. We show that depending on the nature of their coupling, not only can the "supermodes" formed at the overlapping resonances of the coupled cavities have the lowest thresholds and lase first as previously suggested, leading to a manifestation of the typical Vernier effect now in an active system; these supermodes can also have increased thresholds and are hence suppressed, which can be viewed as an inverse Vernier effect. We attribute this effect to detuning-dependent Q-spoiling, and it can lead to an increased free spectrum range and possibly single-mode lasing, which may explain the experimental findings of several previous work. We illustrate this effect using two coupled micro-ring cavities and a micro-ring cavity coupled to a slab cavity, and we discuss its relation to the existence of exceptional points in coupled lasers.

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Section: Discussionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 99%

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Inverse Vernier effect in coupled lasers

Türeci

2015

Phys. Rev. A

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“…Альтернативные подходы к формированию одночастотных ККЛ основаны на применении фотонных кристаллов [4], кольцевых резонаторов [3], связанных резонаторов [5], асимметричных интерферометров Маха−Цендера [6]. Результаты по формированию лазерных резонаторов сложной формы, в том числе арочных квантово-каскадных лазеров, состоящих из линейных и полукольцевых участков, представлены в работах [7][8][9].…”

Section: поступило в редакцию 28 января 2019 г в окончательной редакunclassified

Одночастотная Генерация Арочных Квантово-Каскадных Лазеров При Комнатной Температуре

Бабичев¹,

Гладышев²,

Курочкин³

et al. 2019

Письма В Журнал Технической Физики

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Single-mode lasing at room temperature in quantum-cascade lasers (QCLs) with arched cavity design has been demonstrated. The output optical power in single-mode lasing regime at ~7.7-μm lasing wavelength was above 6 mW with a side-mode suppression ratio of up to 25 dB. The QCL heterostructure for the arched cavities was grown by molecular-beam epitaxy (MBE) based on a heterojunction of In_0.53Ga_0.47As/Al_0.48In_0.52As solid alloys, lattice-matched with InP substrate, and InP layers performing the function of waveguide claddings.

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“…To overcome this limitation of DFB-QCLs, an array of DFB-QCLs with a broad tuning range has been reported[22,135], while this method poses fabrication challenges in ensuring each ridge laser working properly and extra efforts are needed to spatially combine the beams from the array of DFB-QCLs for better collimation[136][137].Despite the large tuning range of EC-QCLs, the mechanical parts within the EC-QCLs cavity make them vibration sensitive and comparatively expensive. One effective approach to overcome these limitations is to utilize Vernier-effect tuning mechanism, based on which the coupled-cavity QCLs and the SG-QCLs were proposed[103][104][138][139]. Nevertheless, both approaches have their intrinsic drawbacks which severely limit their real field applications.…”

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confidence: 99%

Tunable mid-infrared quantum cascade lasers

Meng¹

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There is a list of people to whom I owe the appreciation. The first person I want to thank is my Ph.D supervisor Prof. Qijie WANG who is so smart yet diligent. Without his unconditional encouragement and stimulated guidance, I have no choice to go this far. His unweaving support drives me through the hard days and sleepless nights when I was tackling the tough problems from both experiments and theories. The Ph.D will never be an easy task, but his enthusiasm, insight, and support made my Ph.D years a bitter yet sweet journey. It's really a great honor to study in such a dynamic group with many wonderful and talented members from everywhere. I want to say thank you to all of them for their help and support in my experiments and simulations. I would like to thank the Ph.D students and Postdocs in the offices and clean rooms, for the very insightful discussions and technical supports they gave me when I was in the mist of troubles and problems. Special thanks were given

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Single-mode quantum cascade lasers employing a candy-cane shaped monolithic coupled cavity

Abstract: Articles you may be interested inCoupled-cavity terahertz quantum cascade lasers for single mode operation Appl. Phys. Lett. 104, 241102 (2014); 10.1063/1.4884056 Single-mode quantum cascade lasers employing asymmetric Mach-Zehnder interferometer type cavities

Cited by 18 publications

References 17 publications

Inverse Vernier effect in coupled lasers

Inverse Vernier effect in coupled lasers

Одночастотная Генерация Арочных Квантово-Каскадных Лазеров При Комнатной Температуре

Tunable mid-infrared quantum cascade lasers

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