Dual-wavelength switchable, mid-infrared quantum cascade laser with two shallow-etched distributed Bragg reflectors

Guan, Yanjiao; Wang, Lijun; Zhuo, Ning; Zhang, Jin-Chuan; Zhai, Shenqiang; Liu, Junqi; Liu, Shuman; Liu, Fengqi

doi:10.1364/oe.442507

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…The fabrication process of the planarelectrode device was the same as that in Ref. [16]. Finally, the processed wafer was cleaved to 2 mm long laser bars.…”

Section: Device Design and Fabricationmentioning

confidence: 99%

“…Moreover, a dual-wavelength mid-infrared QCL can also be used to generate terahertz radiation at room temperature based on intracavity differencefrequency generation [13] . Recently, based on stacking two different active core structures in the same waveguide, several kinds of dual-wavelength single-mode QCLs have been demonstrated [14][15][16] . Jagerska et al [14] developed a dual-wavelength QCL with two electrically separated DFB sections and different grating periods, which allow the two wavelengths to be controlled independently.…”

Section: Introductionmentioning

confidence: 99%

“…The other design was a Vernier-based dual-wavelength DFB QCL, where an integrated heater was used to switch between the two DFB wavelengths. In our previous paper [16] , we presented a dual-wavelength switchable QCL with two shallow-etched DBR sections and two gain sections. The multiple electrically isolated sections enabled us to select the two wavelengths independently.…”

Section: Introductionmentioning

confidence: 99%

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Room temperature continuous-wave operation of a dual-wavelength quantum cascade laser

et al. 2023

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We report on the design and fabrication of a dual-wavelength switchable quantum cascade laser (QCL) by optimizing the design of a homogeneous active region and combining superposed distributed feedback gratings. Coaxial, single-mode emissions at two different wavelengths were achieved only through adjusting the bias voltage. Room temperature continuous-wave operation with output powers of above 30 mW and 75 mW was realized for single-mode emission at 7.61 μm and 7.06 μm, respectively. The simplified fabrication process and easy wavelength control of our designed dual-wavelength QCL make it very attractive for developing miniature multi-species gas sensing systems.

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“…The fabrication process of the planarelectrode device was the same as that in Ref. [16]. Finally, the processed wafer was cleaved to 2 mm long laser bars.…”

Section: Device Design and Fabricationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Room temperature continuous-wave operation of a dual-wavelength quantum cascade laser

et al. 2023

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“…The key factors to achieve dual lasing in a single device are: i) two emitting regions and the partition layer that can be grown seamlessly; and ii) each region can provide sufficient net gain. Currently reported lasers employ two sets of QW regions with one set of shorter wavelength QWs and another set of longer wavelength QWs partitioned by a thin electrical barrier 24 – 26 , so that the population inversion can be satisfied in two regions simultaneously. In this work, we observe dual-wavelength SiGeSn lasing in the mid IR range under optical pumping.…”

Section: Introductionmentioning

confidence: 99%

Study of all-group-IV SiGeSn mid-IR lasers with dual wavelength emission

Abernathy,

Ojo,

Said

et al. 2023

Sci Rep

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Direct band gap GeSn alloys have recently emerged as promising lasing source materials for monolithic integration on Si substrate. In this work, optically pumped mid-infrared GeSn lasers were studied with the observation of dual-wavelength lasing at 2187 nm and 2460 nm. Two simultaneous lasing regions include a GeSn buffer layer (bulk) and a SiGeSn/GeSn multiple quantum well structure that were grown seamlessly using a chemical vapor deposition reactor. The onset of dual lasing occurs at 420 kW/cm2. The wider bandgap SiGeSn partitioning barrier enables the independent operation of two gain regions. While the better performance device in terms of lower threshold may be obtained by using two MQW regions design, the preliminary results and discussions in this work paves a way towards all-group-IV dual wavelength lasers monolithically integrated on Si substrate.

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Dual-mode distributed feedback quantum cascade laser based on stacked 3D monolithic integration for on-chip multi-channel gas sensing

Lu,

Guan,

Yang

et al. 2023

Photon. Res.

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To facilitate the development of on-chip integrated mid-infrared multi-channel gas sensing systems, we propose a high-power dual-mode (7.01 and 7.5 μm) distributed feedback quantum cascade laser based on stacked 3D monolithic integration. Longitudinal mode control is achieved by preparing longitudinal nested bi-periodic compound one-dimensional Bragg gratings along the direction of the cavity length in the confinement layer. Additionally, transverse coherent coupling ridges perpendicular to the cavity length direction are fabricated in the upper waveguide layer to promote the fundamental transverse mode output when all ridges are in phase. Stable dual-wavelength simultaneous emission with a side-mode suppression ratio of more than 20 dB was achieved by holographic exposure and wet etching. The entire spectral tuning range covers nearly 100 nm through joint tuning of the injection current and heat-sink temperature. High peak power and beam quality are guaranteed by the parallel coherent integration of seven-element ridge arrays. The device operates in a fundamental supermode with a single-lobed far-field pattern, and its peak output power reaches 3.36 W in pulsed mode at 20°C. This dual-mode laser chip has the potential for in-situ on-chip simultaneous detection of CH4 and C2H6 gases in leak monitoring.

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Dual-wavelength switchable, mid-infrared quantum cascade laser with two shallow-etched distributed Bragg reflectors

Cited by 4 publications

References 13 publications

Room temperature continuous-wave operation of a dual-wavelength quantum cascade laser

Room temperature continuous-wave operation of a dual-wavelength quantum cascade laser

Study of all-group-IV SiGeSn mid-IR lasers with dual wavelength emission

Dual-mode distributed feedback quantum cascade laser based on stacked 3D monolithic integration for on-chip multi-channel gas sensing

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