Electronics Letters · 2001 · 101 citations · 6 references
EngineeringElectrical EngineeringPhysicsOpticsOptoelectronicsPhotonicsDetector TechnologyFree-space OpticsLaser PhysicsOptical DetectorsOptical InstrumentationQuantum OpticsBeam CollimationExternal-cavity LasersFree-space Optical CommunicationNoise Equivalent PowerOptical Link DesignQuantum Cascade LasersSignal-to-noise RatioSignal-to-noise Ratio Analysis
The authors demonstrate a free-space optical data link over 350 m using a Peltier-cooled 9.3 µm quantum cascade laser operating at a duty cycle of almost 50%. On the emitter side, a Ge lens was used for beam collimation and a flat mirror for beam steering, while on the receiver side, a fast room-temperature HgCdTe detector in combination with a phis = 16 cm mirror telescope detected the incoming signal. Short pulses at a maximum repetition rate of 330 MHz were successfully transmitted. The signal-to-noise ratio of the measurement was limited by the power equivalent noise of the detector.
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Photoacoustic spectroscopy with quantum cascade distributed-feedback lasers
Daniel Hofstetter, Mattias Beck, Jérôme Faist et al. · Optics Letters · 2001 · 99 citations
Natural Sciences, Chemistry, Physics +13