Thermal effects in quantum cascade lasers at λ∼4.6 μm under pulsed and continuous-wave modes

Lee, H. K.; Yu, Jae Su

doi:10.1007/s00340-011-4744-4

Cited by 19 publications

(19 citation statements)

References 15 publications

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“…The effect of power fluctuations on the device temperature, and therefore on the laser frequency noise, should be even lower at cryogenic temperatures. The temperature behavior of the thermal resistance in QCLs was simulated in Ref [17]. and shows indeed that the thermal resistance slightly rises with increasing temperature.…”

Section: Discussionmentioning

confidence: 99%

Temperature dependence of the frequency noise in a mid-IR DFB quantum cascade laser from cryogenic to room temperature

Tombez¹,

Schilt²,

Francesco³

et al. 2012

Opt. Express

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Abstract:We report on the measurement of the frequency noise power spectral density in a distributed feedback quantum cascade laser over a wide temperature range, from 128 K to 303 K. As a function of the device temperature, we show that the frequency noise behavior is characterized by two different regimes separated by a steep transition at ≈200 K. While the frequency noise is nearly unchanged above 200 K, it drastically increases at lower temperature with an exponential dependence. We also show that this increase is entirely induced by current noise intrinsic to the device. In contrast to earlier publications, a single laser is used here in a wide temperature range allowing the direct assessment of the temperature dependence of the frequency noise. Baillargeon, and A. Y. Cho, "Rapid-scan Doppler-limited absorption spectroscopy using mid-infrared quantum cascade lasers," Proc. SPIE 3758, 23-33 (1999). 4. T. L.

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Section: Discussionmentioning

confidence: 99%

Temperature dependence of the frequency noise in a mid-IR DFB quantum cascade laser from cryogenic to room temperature

Tombez¹,

Schilt²,

Francesco³

et al. 2012

Opt. Express

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“…2γ 32 is the full-width half maximum (FWHM) broadening of the transition, as obtained from EL measurements, L p is the thickness of one stage, λ is the emission wavelength of the QCL, and n refr is the average refractive index for the AR as per the design. We use the 4.6-μm-emitting QCL by Lyakh et al 45 as the standard device for comparison to our design, as far as the value of the η inj;tot g product, due to the similarity in crystalgrowth method employed (i.e., MOCVD) for the core region.…”

Section: Resultsmentioning

confidence: 99%

“…29 The anisotropic thermal conductivity for the core region is assumed to be close to that obtained for a conventional 4.6-μm-emitting QCL. 32 This is expected to suffice for the purpose of comparing the effectiveness of using InAlAs versus InGaP as cladding-layer materials.…”

Section: Layer Name Compositionmentioning

confidence: 99%

Design considerations for λ ∼ 3.0- to 3.5-μm-emitting quantum cascade lasers on metamorphic buffer layers

et al. 2017

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Design considerations for λ ∼ 3.0-to 3.5-μm-emitting quantum cascade lasers on metamorphic buffer layers," Opt. Eng.Abstract. Quantum cascade lasers (QCLs) that employ metamorphic buffer layers as substrates of variable lattice constant have been designed for emission in the 3.0-to 3.5-μm wavelength range. Theoretical analysis of the active-region (AR) energy band structure, while using an 8-band k • p model, reveals that one can achieve both effective carrier-leakage suppression as well as fast carrier extraction in QCL structures of relatively low strain. Significantly lower indium-content quantum wells (QWs) can be employed for the AR compared to QWs employed for conventional short-wavelength QCL structures grown on InP, which, in turn, is expected to eliminate carrier leakage to indirect-gap valleys (X, L). An analysis of thermo-optical characteristics for the complete device design indicates that high-Al-content AlInAs cladding layers are more effective for both optical confinement and thermal dissipation than InGaP cladding layers. An electroluminescence-spectrum full-width half-maximum linewidth of 54.6 meV is estimated from interface roughness scattering and, by considering both inelastic and elastic scattering, the threshold-current density for 3.39-μm-emitting, 3-mm-long back-facet-coated QCLs is projected to be 1.40 kA∕cm 2 .

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“…Thermal transport in QCLs is often described through the heat diffusion equation, which requires accurate thermal conductivity in each region, a challenging task for the active core that contains many interfaces [17,[45][46][47][48]. It is also very important to include nonequilibrium effects, such as the nonuniform heat-generation rate stemming from the nonuniform temperature distribution [47] and the feedback that the nonequilibrium phonon population has on electron transport [26].…”

Section: Devices)mentioning

confidence: 99%

Quantum Cascade Lasers: Electrothermal Simulation

Piprek¹

2017

Handbook of Optoelectronic Device Modeling and Simulation

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Thermal effects in quantum cascade lasers at λ∼4.6 μm under pulsed and continuous-wave modes

Cited by 19 publications

References 15 publications

Temperature dependence of the frequency noise in a mid-IR DFB quantum cascade laser from cryogenic to room temperature

Temperature dependence of the frequency noise in a mid-IR DFB quantum cascade laser from cryogenic to room temperature

Design considerations for λ ∼ 3.0- to 3.5-μm-emitting quantum cascade lasers on metamorphic buffer layers

Quantum Cascade Lasers: Electrothermal Simulation

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