Ultrafast hole burning in intersubband absorption lines of GaN∕AlN superlattices

Strong heavy-to-light hole intersubband absorption in the valence band of carbon-doped GaAs/AlAs superlattices

Holographic interferometry of ultrafast transients by photochemical hole burning.

A novel approach for interferometric analysis of ultrafast transient processes as short as 10(-13)-10(-14) sec is suggested. The method of holographic storage of ultrafast time-space images in spectrally selective hole-burning materials is used. It is shown that differential interferometric comparison of time-space images, which are permanently stored, provides an effective means to resolve ult...

Persistent spectral hole burning by simultaneous two-photon absorption

We show for the ®rst time persistent spectral hole burning by simultaneous absorption of two 1138 nm photons in an inhomogeneously broadened S1 S0 …Qy† transition of unstable photo-tautomer of chlorin in polymer ®lm at low temperature. Spectrally selective hole burning is achieved due to high (10%) quantum eciency of photo-transformation in that system and high peak intensity (tens of GW/cm) o...

Ultrafast photon drag detector for intersubband spectroscopy

The photon drag effect of a 2D electron gas is measured using the ps infrared pulses of the wavelength-tunable free electron laser source FELIX. The pulsed photon drag response is found to depend critically on the coupling characteristics of the electrical circuit. We therefore developed an impedance and velocity matched photon drag detector. It consists of a GaAs/ AlGaAs multi quantum well sam...

Gain dynamics and ultrafast spectral hole burning in In„Ga...As self-organized quantum dots

Using a femtosecond three-pulse pump-probe technique, we investigated spectral hole-burning and gain recovery dynamics in self-organized In~Ga!As quantum dots. The spectral hole dynamics are qualitatively different from those observed in quantum wells, and allow us to distinguish unambiguously the gain recovery due to intradot relaxation and that due to carrier capture. The gain recovery due to...