Applied Physics Letters · 2007 · 101 citations · 10 references
EngineeringElectrical EngineeringOpticsOptoelectronicsPhotonicsHigh-frequency Semiconductor DevicesMicrowave MeasurementsMicrowave Semiconductor DevicesSemiconductor LasersTerahertz PhotonicsTerahertz SpectroscopyDirect ModulationEmission SpectrumFrequency ModulationFrequency UpconversionParasitic Inductance EffectsQuantum Cascade LasersTerahertz ModulationTerahertz Quantum Cascade Lasers
By directly modulating the bias voltage of a double-metal waveguide, 2.8THz quantum cascade laser, we observe the appearance of multiple gigahertz sidebands in the emission spectrum, with a spacing that can be continuously tuned up to 13GHz. By using an upconversion technique, the terahertz spectrum is shifted at 1.57μm, and displayed on an optical spectrum analyzer. A marked increase in the number of sidebands is observed when the modulation frequency approaches the round-trip frequency (∼12.3GHz). The laser packaging high frequency response has been measured using a microwave rectification technique, and is limited by the bond-wire parasitic inductance.
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2.9 THz quantum cascade lasers operating up to 70K in continuous wave
S. Barbieri, Jesse Alton, Harvey E. Beere et al. · Applied Physics Letters · 2004 · 236 citations