Optogenetic Neuromodulation
... these components are not anchored, the long term effects of such embedded elements will need to be studied. Another alternative is to use vertical-cavity surface-emitting lasers (VCSELs) as a light source. A VCSEL array could be fabricated on chip, implanted in a hollowed out portion of the skull [1 ...
... these components are not anchored, the long term effects of such embedded elements will need to be studied. Another alternative is to use vertical-cavity surface-emitting lasers (VCSELs) as a light source. A VCSEL array could be fabricated on chip, implanted in a hollowed out portion of the skull [1 ...
Influence of Magnetic Field Inhomogeneity on a Magneto
... The protection of relaying systems is a prominent task for optical current sensors. These sensors can recognize sudden failures, such as surges, and identify the failure parts in the power systems. These relaying systems require current sensors, which are mostly electromagnetic devices that suffer f ...
... The protection of relaying systems is a prominent task for optical current sensors. These sensors can recognize sudden failures, such as surges, and identify the failure parts in the power systems. These relaying systems require current sensors, which are mostly electromagnetic devices that suffer f ...
Phase-matching and nonlinear optical processes - jalali
... conversion efficiencies. Through numerical simulations, we show how phase matching can be achieved by the proper design of the rib geometry. The analysis takes into account contributions due to (i) material dispersion, (ii) waveguide dispersion, (iii) self and cross phase modulation, and (iv) birefr ...
... conversion efficiencies. Through numerical simulations, we show how phase matching can be achieved by the proper design of the rib geometry. The analysis takes into account contributions due to (i) material dispersion, (ii) waveguide dispersion, (iii) self and cross phase modulation, and (iv) birefr ...
Generation of vortex beams by an image-rotating - AS
... This charge gives them an orbital angular momentum of m per photon along the propagation axis [11] in addition to the usual spin angular momentum associated with polarization. They have p + 1 radial nodes. Any vortex beam of charge m can be decomposed into a linear combination of Laguerre-Gauss mod ...
... This charge gives them an orbital angular momentum of m per photon along the propagation axis [11] in addition to the usual spin angular momentum associated with polarization. They have p + 1 radial nodes. Any vortex beam of charge m can be decomposed into a linear combination of Laguerre-Gauss mod ...
babinet compensator - Foctek Photonics, Inc.
... compensating quartz block in optical contact with the smaller wedge as shown below. Both wedges are cut with the quartz optic axis parallel to their long edges, and the compensating block has its axis at right angles. In operation, the large wedge is translated across the smaller, thus presenting a ...
... compensating quartz block in optical contact with the smaller wedge as shown below. Both wedges are cut with the quartz optic axis parallel to their long edges, and the compensating block has its axis at right angles. In operation, the large wedge is translated across the smaller, thus presenting a ...
Monolithic, unidirectional single
... low-doped, low-scatter Nd:YAG should improve efficiency and reduce threshold to the point that semiconductor laser-diode pumping would be possible. We believe that the present 109-mW limit on cw singlemode output is caused by thermal birefringence. Since ...
... low-doped, low-scatter Nd:YAG should improve efficiency and reduce threshold to the point that semiconductor laser-diode pumping would be possible. We believe that the present 109-mW limit on cw singlemode output is caused by thermal birefringence. Since ...
Nondegenerate optical Kerr effect in semiconductors
... Nd:YAG laser is used to generate single tp::::: 83 ps (FWHM) pulses at >. = 1.06 J.Lm as the excitation beam. Simultaneously, the second-harmonic of the same laser at >. = 532 nm serves as the weak probe ( tp ::::: 58 ps ). Using this arrangment, we measure n 2 (2w; w) and {3(2w; w). At these wavele ...
... Nd:YAG laser is used to generate single tp::::: 83 ps (FWHM) pulses at >. = 1.06 J.Lm as the excitation beam. Simultaneously, the second-harmonic of the same laser at >. = 532 nm serves as the weak probe ( tp ::::: 58 ps ). Using this arrangment, we measure n 2 (2w; w) and {3(2w; w). At these wavele ...
Originally published as “Ultrafast spin polarization in a multiferroic
... As shown in Fig. 2 (a), the differential transient polarization ellipticity ΔηK = 1/2(ΔηKσ+ - ΔηKσ-) (red squares) between the σ+ and σ- pump beam allows us to minimize the thermal effect as the primary source of the net dichroism excited by the pump beam. In the following, we attribute this to the ...
... As shown in Fig. 2 (a), the differential transient polarization ellipticity ΔηK = 1/2(ΔηKσ+ - ΔηKσ-) (red squares) between the σ+ and σ- pump beam allows us to minimize the thermal effect as the primary source of the net dichroism excited by the pump beam. In the following, we attribute this to the ...
The Influence of Air-hole Filling Fraction of Photonics Crystal Fibers
... fiber. Because of the electrostrictive effect, it can lead to periodic modulation of refractive index of medium when the pump’s power is greater than the Brillouin threshold power. The index grating generated by index modulation scatters the pump light. So Stokes wave is scattered by index grating a ...
... fiber. Because of the electrostrictive effect, it can lead to periodic modulation of refractive index of medium when the pump’s power is greater than the Brillouin threshold power. The index grating generated by index modulation scatters the pump light. So Stokes wave is scattered by index grating a ...
Laser phase and frequency stabilization using an optical resonator
... mentally equivalent to these are used in basically all high performance frequency standards and in other applications where the best possible performance is needed in locking a source to a resonance. However, as implied in the introduction, the high carrier frequency of laser sources leads easily to ...
... mentally equivalent to these are used in basically all high performance frequency standards and in other applications where the best possible performance is needed in locking a source to a resonance. However, as implied in the introduction, the high carrier frequency of laser sources leads easily to ...
G040254-00 - DCC
... • Two sites in the US, Louisiana and Washington Mirror • Michelson interferometers with Fabry-Perot arms Recycling Mirror • Whole optical path enclosed in vacuum Laser/MC • Sensitive to strains around 10-21 6W ...
... • Two sites in the US, Louisiana and Washington Mirror • Michelson interferometers with Fabry-Perot arms Recycling Mirror • Whole optical path enclosed in vacuum Laser/MC • Sensitive to strains around 10-21 6W ...
Fiber Optic Communications
... distributed across all modes. – Mode scrambler is used to achieve steady state for measurement purposes on short fibers. – Cutoff wavelength is the minimum propagation wavelength that can be transmitted. – Mode-field diameter (output spot size) is approximately the core diameter for multimode fibers ...
... distributed across all modes. – Mode scrambler is used to achieve steady state for measurement purposes on short fibers. – Cutoff wavelength is the minimum propagation wavelength that can be transmitted. – Mode-field diameter (output spot size) is approximately the core diameter for multimode fibers ...
Modern battlefield and new materials for eyes protection
... factor by which the optical filter reduces light in the specified wavelength range power. For example, eyewear with OD 3 reduces the beam power by a factor of 1000. In addition to the optical density, sufficient to reduce beam power below the maximum permissible exposure, the laser eyewear can be us ...
... factor by which the optical filter reduces light in the specified wavelength range power. For example, eyewear with OD 3 reduces the beam power by a factor of 1000. In addition to the optical density, sufficient to reduce beam power below the maximum permissible exposure, the laser eyewear can be us ...
Homework Set #2 Due: 1-25-12 Review problem / tutorial on gratings.
... Suppose you have monochromatic light incident on a flat substrate, reflection grating. There will, in general, be many diffracted beams each at a different angle, called orders, coming from the grating simultaneously (only one is shown in the figures). The amount of power in each order is determined ...
... Suppose you have monochromatic light incident on a flat substrate, reflection grating. There will, in general, be many diffracted beams each at a different angle, called orders, coming from the grating simultaneously (only one is shown in the figures). The amount of power in each order is determined ...
Optical amplifier
An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed. Optical amplifiers are important in optical communication and laser physics.There are several different physical mechanisms that can be used to amplify a light signal, which correspond to the major types of optical amplifiers. In doped fibre amplifiers and bulk lasers, stimulated emission in the amplifier's gain medium causes amplification of incoming light. In semiconductor optical amplifiers (SOAs), electron-hole recombination occurs. In Raman amplifiers, Raman scattering of incoming light with phonons in the lattice of the gain medium produces photons coherent with the incoming photons. Parametric amplifiers use parametric amplification.