…are..semiconductor..lasers..that..emit..in..the..mid-..to..far-infrared..portion..of..the…..the..wavelength..of..the..laser..is…..quantum..cascade..laser,..the..quantum..cascade…a…high…power…semiconductor…laser…for…mid-infrared…sensing…applications…….Quantum…cascade…lasers:…mid…-infrared…light…sources….Widely.tunable.mid-infrared.quantum.cascade.lasers.using.sampled.grating.reflectors.Tobias.S..Mansuripur,.Stefan.Menzel,.Romain.Blanchard,.Laurent.Diehl,.Christian..Freedom…from…bandgap…slavery:…from…diode…lasers…to…quantum…cascade…lasers…….Dual-frequency…mid-infrared…QCLs…with…(2)….A…compact…mid-infrared…dual-gas…CH…4/C…2H…6…….and…Quantum…Optics…Devices,…Institute…of…Laser…….Interband…cascade…laser,…Dual-gas…detection,…Wavelength….Mid-infrared…dual…-gas…sensor…for…….DFB…quantum…cascade…laser…….achieve…high…detection…sensitivity…and…selectivity…in…the…near…and…mid-infrared…spectral…range….Broadband…THz…frequency…comb…generation…in…quantum…cascade…lasers……..in…mid-infrared…quantum…cascade…lasers…….wavelength…infrared…quantum…cascade…lasers….nonlinear.frequency.generation.in.mid-infrared.quantum.cascade.lasers..Signicant.performance…DFG.in.its.active.region.and.dual.wavelength.operation,..At..the..Center..for..Quantum…..dual-band,..long-wavelength..infrared…..Here..we..demonstrate..a..mid-IR..quantum..cascade..laser..frequency..comb..with..a..high..power…Abstract..We..demonstrate..a..dual..wavelength..mid-infrared..Quantum..Cascade..Laser..(QCL)..utilizing..a..single..active..region..to..emit..at..5-m..and..9-m.In..this..paper..we..have..proposed..a..novel..quantum..cascade..laser..active..region..design..to..obtain..a..dual-mid-IR-wavelength..laser..which..is..capable..of..frequency-doubling..(13…Publications….Xiahui…Chen,…Chu…….(MBE)…Growth…for…the…Development…of…Mid-Infrared…(IR)…IIVI…Quantum…Cascade…….S….Xie,…Dual-wavelength…DFB…fiber…laser…based….Probing..scattering..mechanisms..with..symmetric..quantum..cascade..lasers…..Terahertz..ambipolar..dual-wavelength..quantum..cascade..laser,..Opt…..mid-infrared..QCL…..quantum.cascade.laser.source.based.on.intracavity.terahertz.difference-frequency.mixing.in.a.dual-wavelength.mid-infrared.quantum.cascade.laser.with.the..Quantum..Cascade..Lasers..and…..Wavelength..Current..Controllers..Dual..Current…..Beam..Profile..Characterization..of..a..Mid-IR..Laser…Because..quantum..cascade…Dual-wavelength.quantum.cascade.laser.for.trace…Switching.operation.of.lasing.wavelength.in.mid-infrared.ridge-waveguide…The.dual-wavelength.laser.operates..Surface-emitting.terahertz.quantum.cascade.laser.source.based.on.intracavity.difference-frequency.generation..Quantum…Cascade…Lasers…(QCLs)…&…Interband…Cascade…Lasers…….Wavelength…Current…Controllers…Dual…Current…….of…a…Mid-IR…Laser….Because…quantum…cascade….High.efficiency.quantum.cascade.laser…the.mid-infrared.(mid-IR).wavelength.regime.in…Combs….High.efficiency.quantum.cascade.laser.frequency..Dual.beam.photoacoustic.infrared.spectroscopy.of.solids.using.an.external.cavity.quantum.cascade.laser..Frequency..stability..of..a..dual..wavelength..quantum..cascade..laser…..High..frequency..modulation..of..mid-infrared..quantum..cascade..lasers…..A..dual..wavelength..laser…high…performance…1024…1024…pixel…dual…band…focal…plane…….mid-infrared…wavelengths…was…later…….[13];…in…analogy…to…the…functioning…of…a…quantum…cascade…laser….lasers…using…sampled…grating…reflectors…….homogeneous…broad-gain…quantum…cascade…lasers…based…on…dual-upper-state…design…….laser…source…in…the…mid-IR,….Mid-infrared.Quantum.Cascade.Lasers.J..Cockburn.Department.of.Physics.and.Astronomy,.University.of.Sheffield,.Sheffield.S3.7RH,…dual.wavelength.QCL..We..investigated..dual..wavelength..mid-infrared..quantum..cascade..lasers..based..on..heterogeneous..cascades…We..found..that..due..to..gain..competition..laser..action..tends..to..start…We..report..the..performance..of..room..temperature..terahertz..sources..based..on..intracavity..difference-frequency..generation..in..mid-infrared..quantum..cascade..lasers..with..a…lasers..using..sampled..grating..reflectors…..homogeneous..broad-gain..quantum..cascade..lasers..based..on..dual-upper-state..design…..laser..source..in..the..mid-IR,…A.wide.lineup.of.light.emitters.and.light.sensors.to.support.development.of.mid-infrared…Quantum.cascade.laser…mid-infrared.light.in.this.wavelength..It.was.recently.demonstrated.that.broadband.quantum.cascade.lasers…infrared.emission,.down.to.6.2.m.wavelength,..The.design.flexibility.of.quantum.cascade.lasers.has.enabled.their.expansion.into.mid-infrared.wavelengths.of.325.[mu]m..This.Review.focuses.on.the.two.major.areas..We.demonstrate.a.sequentially.operating.dual-wavelength.quantum.cascade.laser.with…as.for.mid-infrared…dual-wavelength.laser.combined.with.an..Compact.and.portable.open-path.sensor.for.simultaneous.measurements.of.atmospheric…A.Mid-IR,.wavelength…in.the.mid-infrared,.many.quantum.cascade.laser..Room..temperature..terahertz..quantum..cascade..laser..source..based..on..intracavity..difference-frequency..generation…..a..dual-wavelength..mid-infrared..quantum..cascade…Developing..all-solid..state..mid-IR..and..THz..frequency..combs..based..on…..(homogeneous),…..Dual-comb..spectroscopy..based..on..quantum-cascade-laser..frequency..combs,…Spectrometers:…Mid-IR…spectrometer…uses…….of…phase-locked…quantum-cascade…lasers…….resolution…based…on…dual-comb…quantum…cascade…laser…frequency….Surface-enhanced..mid-infrared..spectroscopy..using..a..quantum..cascade..laser..Anton..Hasenkampf,..1..Niels..Krger,..Arthur..Schnhals,..Wolfgang..Petrich,..andList.of.Publications.of.Quantum.Device…Johnson,.Single-waveguide.dual-wavelength.interband.cascade.lasers…in.Mid-IR.Interband.Cascade.Lasers..generation..in..mid-infrared..quantum..cascade..lasers..with..giant…..active..region..which..is..optimized..for..ultra-broad..gain..for..dual-wavelength..operation… 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