Publications

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Ultrafast gain switching of THz quantum cascade lasers: Principle and applications

Summary form only given.

Ultrafast gain switching of THz quantum cascade lasers: THz pulse amplification and injection seeding

Laser action normally is initiated by the amplification of spontaneous emission.

Ultrafast heating of silicon-on-sapphire by femtosecond optical pulses.

We monitor the refractive index n + ik of an optically thin silicon layer following femtosecond photo-excitation below the threshold fluence E(TH) for melting in order to measure the rate of lattic

Ultrafast high-field transport in semiconductors

Non-equilibrium transport in GaAs and InP is investigated at electric fields up to 130 kV/cm and with a time resolution of 20 fs.

Ultrafast InGaAs/InGaAlAs multiple-quantum-well electro-absorption modulator for wavelength conversion at high bit rates

We report on InGaAs/InGaAlAs electro-absorption modulators for ultrafast all-optical signal processing. The structure design is based on the use of small conduction and valence band offsets.

Ultrafast Interferometric Investigation of Resonant Secondary Emission from Quantum Well Excitons

We present the first direct investigation of the coherence properties of resonant secondary emission (RSE) from quantum well exciton.

Ultrafast intersubband electron relaxation at ∼1.55 μ wavelength in GaN/AlGaN quantum well structures

We report on the first comparative study of room temperature intersubband (IS) scattering lifetimes in a variety of single and coupled double GaN/AlGaN MQW samples at different excitation powers an

Ultrafast intersubband transitions at λ ∼ 1.35-1.55 μ in GaN/AlGaN multiple quantum wells

We present measurements of intersubband transitions in the communications wavelength range using GaN/AlGaN heterostructures that have multiple single and coupled quantum wells.

Ultrafast laser pulse spectral domain differential phase shift keying

Pulse spectral-domain differential-phase-shift-keying has been demonstrated using AOM-based pulse shaping for modulation and spectral interferometry for demodulation.

Ultrafast Luminescence Spectroscopy Using Sum-Frequency-Generation.

This paper reviews the basic concepts of sum-frequency-generation and discusses its application to the measurement of time resolved luminescence spectra with subpicosecond time resolution.