High-Power Mid-Infrared Quantum Cascade Lasers for Free-Space Communications

Turville-Heitz, Morgan; Ryu, Jin-Sook; Kirch, Jeremy; Jacobs, Steve; Marsland, Robert; Earles, T.; Ruder, Steven; Oresick, K.; Botez, D.; Mawst, Luke J.

doi:10.1109/ipc53466.2022.9975626

Cited by 1 publication

(5 citation statements)

References 3 publications

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“…Most recently, more reliable and favorable results were obtained when the heterodyne experiment was repeated using an RCID with D = 30 µm and λ res matching the QCL wavelength. Those findings will be reported elsewhere [19,20].…”

Section: Performance Characterizationsupporting

confidence: 62%

“…Promising applications of the MWIR RCIDs include free space optical communication [17,19], chemical sensing [13,23], and on-chip spectroscopy [24].…”

Section: Discussionmentioning

confidence: 99%

“…In particular, the resonance wavelengths for devices with smaller mesa diameters, which are needed to minimize the capacitance for high frequency response, came out appreciably shorter than the targeted value. This prevented satisfactory alignment of λ res with the wavelengths of high-speed quantum cascade lasers (QCLs) from U. Wisconsin Madison [17] that were available for the measurements.…”

Section: Reflectivity Diagnostic For Reliably Targeting the Resonance...mentioning

confidence: 99%

“…The response is then limited by the RC time constant, which favors a small mesa diameter that minimizes the capacitance. Furthermore, the heterodyne characterization of the RCID frequency response, as performed by Intraband, requires that the resonance wavelength of the small-diameter mesa match that of the laser employed for the experiment (in this case, a QCL provided by U. Wisconsin Madison [17]). In earlier experiments employing small-diameter RCIDs that were processed in parallel with the larger-diameter Device A, λ res came out substantially shorter than was targeted, which meant the characterization of frequency response was performed with EQE in the 2-6% range at best.…”

Section: Performance Characterizationmentioning

confidence: 99%

“…In the latest round of processing, however, the reflectivity measurements after deposition of the Ge spacer guided compensating adjustment of the resonance. The resulting EQE was measured at Intraband using two single-mode high-speed distributed feedback QCLs fabricated at U. Wisconsin -Madison [17]. By current and temperature tuning, the wavelength of one laser could be varied from 4.596 to 4.610 µm, while the other could be varied from 4.610 to 4.623 µm.…”

Section: Performance Characterizationmentioning

confidence: 99%

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High-sensitivity mid-wave resonant cavity infrared detectors

Kim,

Canedy

et al. 2024

Quantum Sensing and Nano Electronics and Photonics XX

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Resonant cavity infrared detectors (RCIDs) can reduce the noise in sensing a laser signal by strongly suppressing background photocurrent at wavelengths outside the narrow spectral band of interest. We recently reported an RCID with 100-nm-thick InAsSb/InAs absorber, GaAs/AlGaAs bottom mirror, and Ge/SiO 2 top mirror. At T = 300 K, the external quantum efficiency reached 58% at λ res ≈ 4.6 µm, with linewidth δλ = 27 nm. The characteristics at 125 K implied a specific detectivity of 5.5 × 10 12 cm Hz ½ /W, which is more than 3× higher than for a state-of-the-art broadband HgCdTe device operating at that temperature. However, a prominent variation with mesa diameter of the deposited Ge spacer thickness made it difficult to predictably control λ res for devices processed with a given diameter. This has been addressed by measuring the reflectivity spectrum following deposition of the spacer, so that thicknesses of the top mirror's SiO 2 and Ge layers could be adjusted appropriately to attain a targeted resonance. This was especially beneficial in matching the λ res for a small mesa, needed to minimize the capacitance in high-frequency measurements, to the emission wavelength of a given ewquantum cascade laser.

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Section: Performance Characterizationsupporting

confidence: 62%

“…Promising applications of the MWIR RCIDs include free space optical communication [17,19], chemical sensing [13,23], and on-chip spectroscopy [24].…”

Section: Discussionmentioning

confidence: 99%

Section: Reflectivity Diagnostic For Reliably Targeting the Resonance...mentioning

confidence: 99%

Section: Performance Characterizationmentioning

confidence: 99%

Section: Performance Characterizationmentioning

confidence: 99%

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