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A new pulse characterization concept capable to measure the absolute value of carrier-envelope phase has been demonstrated. Complete waveforms of sub-single-cycle pulses were characterized by using the method.
We present the creation and control of optical gain by interrupting the temporal evolution of the dipole response of a quantum-mechanical two-level system. Our theoretical analysis is verified by transient absorption spectroscopy in helium.
A radio-frequency modulated pulse train is generated by means of a frequency-shifted feedback on a Q-switched laser. The phase coherence of the modulation allows one to perform Lidar-Radar measurements on indoor moving targets.
Employing parametric amplification in the Fourier domain rather than in time domain circumvents phase mismatch and damage threshold limitations of laser amplifiers and enabled CEP stable, 1.43mJ, sub-two cycle pulses at 1.8μm.
We demonstrate a phase-stable, 3-channel parametric synthesizer generating a 2-octave-wide spectrum (0.52–2.4μm). After two amplification stages, the combined 125-μJ output supports 1.9-fs waveforms. The third stage of the IR degenerate OPA yields 1.7-mJ octave-spanning spectra.
Optical dual-pulse sampling for detection of vector signal is proposed to alleviate the bandwidth requirement on optoelectronic devices. An experiment on receiving 4-Gbaud QPSK 16-GHz radio over fiber has been demonstrated experimentally.
GaSb-based type-I quantum-well diode lasers with two-cascade active region were designed and fabricated. The injection is achieved by means of tunnel junction between AlGaAsSb graded composition and InAs/AlSb chirped superlattice layers. The devices operate in continuous wave regime at room temperature and demonstrate twofold improvement of injection efficiency as compared to reference single cascade...
We report the generation of a mid-IR supercontinuum created by passing ≈8psec duration pulses at ≈3260nm through dispersion-engineered As2S3 and Ge11.5As24Se64.5 waveguides.
We demonstrate a phase-noise linear increment proportional to the spectral mode number of a 25-GHz-spaced frequency comb generated from a phase-modulated laser by using the beat note between each comb mode and a tunable laser.
We propose to utilize a diverging time lens for LiNbO3 modulator based OTDM demultiplexing. Error-free detection is successfully demonstrated with 2.4-dB power penalty for all channels, 1.1 dB for the best channel.
We demonstrate spectral broadening of a low noise microresonator based near-infrared frequency comb to almost two thirds of an octave as required for self-referencing. The low noise properties of the unbroadened spectrum are preserved.
Our ultrafast optical pump-probe measurements of 2D atomic material MoS2 show that the interband and intraband relaxation dynamics of photoexcited carriers vary significantly as a function of the number of atomic layers. Coherent phonon oscillations are also observed in our measurements.
We report the storage and retrieval of broadband optical pulses using a Raman interaction in a room-temperature ensemble of cesium atoms confined in a hollow-core photonic-crystal fibre.
The conductivity of a dielectric is reversibly increased by several orders of magnitude on a femtosecond timescale by exploiting the instantaneous electric field of intense few-cycle near-infrared laser pulses leading to measurable ultrafast electric currents.
Time-resolved x-ray diffraction is utilized to visualize laser generated transient strain formation from nanometer-scaled laser-excited gold films into crystalline substrates. We directly invert the time-domain signals to reconstruct the spatio-temporal shape of the transient strain.
Highly nonlinear, but reversible changes in the refractive index of SiO2 induced by strong near-infrared light fields are probed with wave-cycle resolved optical reflectivity and attosecond streaking characterization of the transmitted field.
We demonstrate a new temporal cloak capable of hiding 46% of the entire time axis at a repetition rate of 12.7 GHz. Our results introduce temporal cloaking into the practical domain of secure optical communication.
Super-luminescent jet light is produced via disrupted conical emission excited by focused millijoule 50 fs laser pulses in air. Phase-matching requirement of four-wave mixing at specific diffraction angles is responsible for the observed phenomenon.
A mode-locked Ti:sapphire laser with intracavity Fabry-Perot produces a frequency comb at 7 GHz including a fine structure at 100 MHz. The complex nature of this interwoven comb is analyzed.
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