Thermal analysis of InP-based quantum cascade lasers for efficient heat dissipation

Lee, H. K.; Chung, Kwansoo; Yu, Jae Su

doi:10.1007/s00340-008-3265-2

Cited by 11 publications

(3 citation statements)

References 16 publications

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“…15,16) In QWs and SLs, the thermal conductivity is lower than that of bulk materials due to the phonon confinement effect and interface resistance. [17][18][19][20] Thus, the active region and SLs have the lower thermal conductivity. For more reasonable thermal analysis, the effective anisotropic thermal conductivity was taken into account in this simulation.…”

Section: Experimental Procedures and Thermal Modelingmentioning

confidence: 99%

Thermal Analysis of InGaN/GaN Multiple Quantum Well Light Emitting Diodes with Different Mesa Sizes

Lee

2010

Jpn. J. Appl. Phys.

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We analyze experimentally and theoretically the thermal characteristics of 470 nm InGaN/GaN light emitting diodes (LEDs) with different mesa sizes for efficient heat dissipation. For various mesa sizes, the junction temperature is measured as a function of injection current by the diode forward voltage method. The junction temperature (T j) increases linearly with injection current and it rises rapidly with the reduction in mesa size. The thermal parameters, such as the junction temperature, temperature profile, and thermal resistance (R th), are obtained from thermal simulations with the heat source density, determined from the measured light–current–voltage data, using a three dimensional heat dissipation model. At 200 mA, the T j values of LEDs are theoretically calculated as 392.7 and 578 K for 450 ×450 and 250 ×250 µm2, respectively. The thermal resistance is kept nearly constant due to a linear relationship between junction temperature and injection current and it is reduced as the mesa size increases, indicating a low R th of < 75 K/W for 450 ×450 µm2 LED. The R th values obtained by the thermal simulation are fairly consistent with the experimental data. The use of the substrate with a relatively high thermal conductivity can also improve significantly the R th of LEDs.

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Section: Experimental Procedures and Thermal Modelingmentioning

confidence: 99%

Thermal Analysis of InGaN/GaN Multiple Quantum Well Light Emitting Diodes with Different Mesa Sizes

Lee

2010

Jpn. J. Appl. Phys.

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“…QCL active regions have very high heat dissipation because of the much higher operating voltage due to the cascade scheme and the higher threshold current density due to the free-carrier absorption, which increases roughly with the square of the wavelength. ,, During CW operation, the temperature of the active region is much higher than the heat sink temperature. In normally used microcavity structures, it is very difficult to conduct heat between the active region and the heat sink with only one vertical heat dissipation channel . In addition, surface passivation of the leakage current is critical for CW operation of microcavity QCLs, which are susceptible to thermally activated surface states …”

Section: Introductionmentioning

confidence: 99%

“…In normally used microcavity structures, it is very difficult to conduct heat between the active region and the heat sink with only one vertical heat dissipation channel. 42 In addition, surface passivation of the leakage current is critical for CW operation of microcavity QCLs, which are susceptible to thermally activated surface states. 43 To solve the above problems, we designed a selective electrical isolation scheme and applied it to the specific region of the cavity together with surface passivation.…”

Section: ■ Introductionmentioning

confidence: 99%

Continuous-Wave Operation of Microcavity Quantum Cascade Lasers in Whispering-Gallery Mode

et al. 2022

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Microresonator-based lasers are key light sources in photonic integrated circuits for future optical communication. Recently developed on-chip sensing makes microcavity lasers at mid-infrared wavelengths very appealing owing to the abundant absorption fingerprints in this spectral range (3–12 μm). As leading semiconductor mid-infrared laser sources, quantum cascade lasers are ideal candidates for on-chip sensing, and significant achievements have been made using deformed cavities for unidirectional emission. However, the much higher operating voltage and thermal load from the cascade scheme and the sidewall current leakage due to the thermally activated surface states make the continuous-wave operation of microcavity quantum cascade lasers rather challenging. Here, we designed a selective electrical isolation scheme for the specific region of the cavity and combined it with surface passivation. We experimentally demonstrated the first continuous-wave operation of microcavity quantum cascade lasers up to a temperature of 5 °C at an emission wavelength of 8 μm. This design significantly reduces the injection current while ensuring a low optical loss for the whispering-gallery mode with a high quality factor, thereby reducing the thermal dissipation power. It is worth noting that this design is applicable to a variety of whispering-gallery-mode resonators, especially large cavities, which greatly develops the potential of microcavity quantum cascade lasers as continuous-wave mid-infrared light sources for photonic integrated circuits and microcavity physics.

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Thermal analysis of high-index-contrast grating (HCG)-based VCSEL

Asadi

Abbasian

Bostanabad

et al. 2014

Optik

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Thermal analysis of InP-based quantum cascade lasers for efficient heat dissipation

Cited by 11 publications

References 16 publications

Thermal Analysis of InGaN/GaN Multiple Quantum Well Light Emitting Diodes with Different Mesa Sizes

Thermal Analysis of InGaN/GaN Multiple Quantum Well Light Emitting Diodes with Different Mesa Sizes

Continuous-Wave Operation of Microcavity Quantum Cascade Lasers in Whispering-Gallery Mode

Thermal analysis of high-index-contrast grating (HCG)-based VCSEL

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