In this study the methods of three-dimensional (3D) wavefront intensity modulation by employing contrast-inverted holography, previously introduced as Gabor inverted are further investigated. The present provides recipes for creating 3D modulations using phase-only and amplitude-only modulators compares results. spherical waves is also demonstrated, miniaturization beams discussed; it shown tha...

We study the output of a semiconductor laser with optical feedback operated in low-frequency fluctuations (LFFs) regime and subject to weak sinusoidal current modulation. In LFF regime, intensity exhibits abrupt drops, after which it recovers gradually. Without modulation, drops occur at irregular times, while, they can lock external modulation occur, depending on parameters, every two or three...

BACKGROUND Human, hairy skin contains a subgroup of C-fibers, the C-low threshold mechanoreceptive afferents ((C-LTMR) C-tactile or C-touch (CT) fibers) that are linked with the signaling of affective aspects of human touch. Recent studies suggest an involvement of these afferents in the modulation of pain in healthy volunteers. Small fiber neuropathy (SFN) is associated with a damage of C-fibe...

We show experimentally that the effects of pulse delay and advancement usually ascribed to the "slow and fast light" under conditions of the coherent population oscillations (CPO) can be universally observed with incoherent light fields on objects with the pure-intensity nonlinearity. As a light source, we used an incandescent lamp and as objects for study, a photochromic glass and a thermochro...

The electron dynamics in modulation p-doped InGaAs/GaAs self-assembled quantum dots have been studied by time-integrated and time-resolved upconversion photoluminescence. A significant state filling effect is observed with exclusion of the phonon bottleneck effect. The rise time and decay time are found to vary with the excitation intensity for the ground state and excited states of the quantum...

For actively modulated In-line Sagnac interferential all optic fiber current transformers (AOFCTs), the accuracies are directly affected by the amplitude of the modulation signal. In order to deeply undertand the function of the modulator, a theoretical model of modulation effect to AOFCTs is built up in this paper. The effect of the amplitude of the modulation signal to the output intensity of...