All-optical modulation at mid-infrared wavelength with QCLs

International audienc

Chaos synchronization in mid-infrared quantum cascade lasers for private free-space communication

International audienc

Investigations on photocurrent bi-stability of a two-color mode-locked quantum dot laser

In this paper, state-of-the-art research on two-color passively mode-locked InAs/InGaAs quantum dot lasers is reviewed with a focus on the influence of resistor Self-Electro-Optical Effect absorber biasing on emission-state transitions and on absorber photocurrent bi-stability. We start with the recently studied absorber photocurrent characteristics of quantum dot lasers with two different gain-bandwidth chirping and in particular the emissionstate-transition from sole ground-state lasing to two-color ground-state and excited-state lasing of the strongly chirped laser. By modifying the degree of chirping and the operating conditions, we extend this two-color lasing to a regime with a z-shaped emission-state and photocurrent transition. Finally, we find a z-shaped emissionstate and an absorber photocurrent bi-stability and hysteresis without the transition via a two-color operation regime. The emission-state and absorber photocurrent bi-stability and its dependences on biasing conditions are explained qualitativel

Experimental investigations on the generation and amplification of high power short pulses by a quantum dot laser and amplifier

In this paper, we study experimentally the generation of picosecond short optical pulses with an improved peak power of 42 W at a repetition rate of 16 GHz and an associated pulse width of 1.4 ps. Pulses from a tapered quantum dot laser emitting at 1250 nm are amplified using a tapered quantum dot optical amplifier without any pulse post-compression. We specifically investigate the amplification behavior of this master-oscillator power-amplifier configuration with a focus on the pulse peak power, pulse width, average power and amplified spontaneous emission towards improving the figure of merit for two photon excitation microscop

Search for relativistic magnetic monopoles with five years of the ANTARES detector data

A search for magnetic monopoles using five years of data recorded with the ANTARES neutrino telescope from January 2008 to December 2012 with a total live time of 1121 days is presented. The analysis is carried out in the range beta > 0.6 of magnetic monopole velocities using a strategy based on run-by-run Monte Carlo simulations. No signal above the background expectation from atmospheric muons and atmospheric neutrinos is observed, and upper limits are set on the magnetic monopole flux ranging from 5.7 x 10(-16) to 1.5 x 10(-18) cm(-2).s(-1).sr(-1)

Measurement of the D+/- production asymmetry in 7 TeV pp collisions

The asymmetry in the production cross-section σ of D± mesons,AP=σ(D+)-σ(D-)σ(D+)+σ(D-), is measured in bins of pseudorapidity η and transverse momentum p<inf>T</inf> within the acceptance of the LHCb detector. The result is obtained with a sample of D+→KS0π+ decays corresponding to an integrated luminosity of 1.0 fb-1, collected in pp collisions at a centre of mass energy of 7 TeV at the Large Hadron Collider. When integrated over the kinematic range 2.0<p<inf>T</inf><18.0 GeV/c and 2.20<η<4.75, the production asymmetry is A<inf>P</inf>=(-0.96±0.26±0.18)%. The uncertainties quoted are statistical and systematic, respectively. The result assumes that any direct CP violation in the D+→KS0π+ decay is negligible. No significant dependence on η or p<inf>T</inf> is observed. © 2012 CERN