Lecture 7: Optical Characterization of Inorganic - CDT-PV
... • Optimum band gap for PV determined by solar spectrum and payoff between absorption and thermal losses • Thickness of absorber required is determined by absorption coefficient • Absorption coefficient is not straightforward to obtain from T and R • Direct band gap significantly better than indirect ...
... • Optimum band gap for PV determined by solar spectrum and payoff between absorption and thermal losses • Thickness of absorber required is determined by absorption coefficient • Absorption coefficient is not straightforward to obtain from T and R • Direct band gap significantly better than indirect ...
Physical properties of silver oxide thin films by pulsed laser deposition
... tetragonal [5–7]. Silver oxide thin films have been prepared by several techniques: RF and dc sputtering [8, 9], thermal evaporation [10], chemical synthesis [2] and by pulsed laser deposition (PLD) [11]. Our earlier studies [8] on silver oxide thin films prepared by the reactive dc magnetron sputte ...
... tetragonal [5–7]. Silver oxide thin films have been prepared by several techniques: RF and dc sputtering [8, 9], thermal evaporation [10], chemical synthesis [2] and by pulsed laser deposition (PLD) [11]. Our earlier studies [8] on silver oxide thin films prepared by the reactive dc magnetron sputte ...
Non-reciprocal ultrafast laser writing
... thermally equalize with the lattice in a few picoseconds and finally recombine with nearby ions in just a few nanoseconds or even faster. However, at the pulse repetition rate of 250 kHz, the time interval between laser pulses is at least 1,000 times longer. What is there that ‘remembers’ what direc ...
... thermally equalize with the lattice in a few picoseconds and finally recombine with nearby ions in just a few nanoseconds or even faster. However, at the pulse repetition rate of 250 kHz, the time interval between laser pulses is at least 1,000 times longer. What is there that ‘remembers’ what direc ...
Novel Approach to the Study of Surface Plasmon Resonance and
... A spheroid is a quadric surface in three dimensions obtained by rotating an ellipse about one of its principal axes. Three particular cases of a spheroid are: 1) the ellipse is rotated about its major axis, the surface is a prolate spheroid; 2) the ellipse is rotated about its minor axis, the surfac ...
... A spheroid is a quadric surface in three dimensions obtained by rotating an ellipse about one of its principal axes. Three particular cases of a spheroid are: 1) the ellipse is rotated about its major axis, the surface is a prolate spheroid; 2) the ellipse is rotated about its minor axis, the surfac ...
Laser Doppler Flowmetry - a Theoretical Framework
... “Doppler” refers to the frequency shift that arises in light that has been scattered by moving red blood cells. This fundamental principle constitutes the basics of LDF theory. In other words, by illuminating a tissue sample with single-frequency light and processing the frequency distribution of th ...
... “Doppler” refers to the frequency shift that arises in light that has been scattered by moving red blood cells. This fundamental principle constitutes the basics of LDF theory. In other words, by illuminating a tissue sample with single-frequency light and processing the frequency distribution of th ...
M. Tech in Optoelectronics and Laser Technology
... Need for fiber optic Communication, evolution of light wave systems and its components. Optical Fiber – their classification, essentials of electromagnetic theory – total internal reflection, Good Hanchen shifts Dispersion in Single mode fiber, fiber losses, Non liner optical effects and polarizatio ...
... Need for fiber optic Communication, evolution of light wave systems and its components. Optical Fiber – their classification, essentials of electromagnetic theory – total internal reflection, Good Hanchen shifts Dispersion in Single mode fiber, fiber losses, Non liner optical effects and polarizatio ...
Measuring amplitude and phase in optical fields with
... require coherent detection methods, in particular heterodyne scanning probe microscope (heterodyne SNOM), which allow the measurement of amplitude and phase of the optical field with sub-wavelength resolution. We discuss some basic properties of phase distributions. Light waves diffracted by microst ...
... require coherent detection methods, in particular heterodyne scanning probe microscope (heterodyne SNOM), which allow the measurement of amplitude and phase of the optical field with sub-wavelength resolution. We discuss some basic properties of phase distributions. Light waves diffracted by microst ...
Effective Area of Optical Fibres
... Optical fibres in telecommunication systems now carry more channels and higher optical powers than ever before. Systems are operating in which the fibre carries such a high optical power density that signals can modify the transmission properties of the fibre. Optical channels can then affect how th ...
... Optical fibres in telecommunication systems now carry more channels and higher optical powers than ever before. Systems are operating in which the fibre carries such a high optical power density that signals can modify the transmission properties of the fibre. Optical channels can then affect how th ...
Microscopy - PSSurvival.com
... Growth of protein crystals results in both protein and salt crystals. Both are colorless and microscopic. Recovery of the protein crystals requires imaging which can be done by the intrinsic fluorescence of the protein or by using transmission microscopy. Both methods require an ultraviolet microsco ...
... Growth of protein crystals results in both protein and salt crystals. Both are colorless and microscopic. Recovery of the protein crystals requires imaging which can be done by the intrinsic fluorescence of the protein or by using transmission microscopy. Both methods require an ultraviolet microsco ...
Ultrafast Acoustic Phonon Ballistics in Semiconductor Heterostructures
... resulting stress gradient driving u in Eq. (1) is weaker. The phonon wave packet is reflected by the free surface back into the sample. If the phonon deflection signal were sensitive only to the geometric bowing of the sample surface, a step change is expected when the phonons arrive. Instead, the o ...
... resulting stress gradient driving u in Eq. (1) is weaker. The phonon wave packet is reflected by the free surface back into the sample. If the phonon deflection signal were sensitive only to the geometric bowing of the sample surface, a step change is expected when the phonons arrive. Instead, the o ...
Two-Color Two-Photon Excitation Using Femtosecond Laser Pulses
... The effect of differently polarized excitation photons on the fluorescence intensity is also investigated. As shown in Figure 7, a change from two parallel polarized photons (r ls b ls) to two perpendicular photons (r ls b lp) results in a reduction of fluorescence intensity to approximately 40% of ...
... The effect of differently polarized excitation photons on the fluorescence intensity is also investigated. As shown in Figure 7, a change from two parallel polarized photons (r ls b ls) to two perpendicular photons (r ls b lp) results in a reduction of fluorescence intensity to approximately 40% of ...
Theoretical Modeling of Magnesium Ion Imprints in the Raman
... themselves, they cause notable changes in the water Raman signal. Therefore, in this study, we used a combination of Raman spectroscopy and computer modeling to analyze the magnesium hydration shell and origin of the signal. In the measured spectra of several salts (LiCl, NaCl, KCl, MgCl2, CaCl2, Mg ...
... themselves, they cause notable changes in the water Raman signal. Therefore, in this study, we used a combination of Raman spectroscopy and computer modeling to analyze the magnesium hydration shell and origin of the signal. In the measured spectra of several salts (LiCl, NaCl, KCl, MgCl2, CaCl2, Mg ...
Coherent population trapping resonances at lower atomic
... given features, we will further analyse CPT resonances in absorption of the probe beam on the basis of the simple model of the nonclosed L-system (Fig. 1), where states |1ñ, |2ñ and |3ñ correspond to levels 6S1/2(F = 3), 6S1/2(F = 4) and 6P3/2(F¢ = 3) (Fig. 2) with the exception of three indicated e ...
... given features, we will further analyse CPT resonances in absorption of the probe beam on the basis of the simple model of the nonclosed L-system (Fig. 1), where states |1ñ, |2ñ and |3ñ correspond to levels 6S1/2(F = 3), 6S1/2(F = 4) and 6P3/2(F¢ = 3) (Fig. 2) with the exception of three indicated e ...
Metal surface structuring with spatiotemporally focused femtosecond
... surfaces with the two schemes. The STF allows for producing high-quality surfaces without much signature of thermal influences even at the loose focusing condition which gives rise to large focal spot sizes and high peak intensities for promoting the manufacturing throughputs. Thus, our result is vi ...
... surfaces with the two schemes. The STF allows for producing high-quality surfaces without much signature of thermal influences even at the loose focusing condition which gives rise to large focal spot sizes and high peak intensities for promoting the manufacturing throughputs. Thus, our result is vi ...
Incoherent transport through molecules on silicon in the vicinity of a
... hence, current starts flowing at lower tip voltages. We solve the three-dimensional 共3D兲 Laplace equation using the finite-element method to obtain the potential profile across styrene due to the tip voltage. This method has been discussed in detail in Ref. 17. This method also provides the zero bia ...
... hence, current starts flowing at lower tip voltages. We solve the three-dimensional 共3D兲 Laplace equation using the finite-element method to obtain the potential profile across styrene due to the tip voltage. This method has been discussed in detail in Ref. 17. This method also provides the zero bia ...
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... microspectroscopy system. The 488 nm line of an Innova Ar+ laser from Coherent Inc. was used as the excitation source. The laser was focused to less than 5 μm on the sample with an average power of 30 mW by an Olympus microscope with a 20× objective. A 15× eyepiece and a digital camera allowed for t ...
... microspectroscopy system. The 488 nm line of an Innova Ar+ laser from Coherent Inc. was used as the excitation source. The laser was focused to less than 5 μm on the sample with an average power of 30 mW by an Olympus microscope with a 20× objective. A 15× eyepiece and a digital camera allowed for t ...
Pulsed Quasi-monochromatic x-ray source for radiography
... between x-ray source to target and target to detector (which is required to record an event (laser shocked target) of size approximately 150 to 200 µm). The x-ray radiograph of S. S. wire, S. S. mesh and 20 µm Al foil have been recorded. Figure 4a shows the optical microscope image of the 400 µm thi ...
... between x-ray source to target and target to detector (which is required to record an event (laser shocked target) of size approximately 150 to 200 µm). The x-ray radiograph of S. S. wire, S. S. mesh and 20 µm Al foil have been recorded. Figure 4a shows the optical microscope image of the 400 µm thi ...
Real-Time Multicolor DNA Detection with Chemoresponsive
... grating signal, although attenuation of undesired signals is also possible. The optical basis for both the amplification and selective readout is in the contribution of resonant imaginary or absorptive components of the refractive index to the observed changes in diffraction efficiency. We reasoned ...
... grating signal, although attenuation of undesired signals is also possible. The optical basis for both the amplification and selective readout is in the contribution of resonant imaginary or absorptive components of the refractive index to the observed changes in diffraction efficiency. We reasoned ...
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... our group recently demonstrated a new type of source which relies instead on parametric processes in optical fibers utilizing the χ (3) , or Kerr nonlinearity [4, 5, 6, 7]. In the experiments conducted by Fiorentino et al. [5] and Li et al. [6, 7], a commercially available dispersionshifted fiber wa ...
... our group recently demonstrated a new type of source which relies instead on parametric processes in optical fibers utilizing the χ (3) , or Kerr nonlinearity [4, 5, 6, 7]. In the experiments conducted by Fiorentino et al. [5] and Li et al. [6, 7], a commercially available dispersionshifted fiber wa ...
Wavelength verification of laser through varied slit widths using a
... ABSTRACT: Being able to behave as a wave, light can be dispersed from its source point using slit/s. This is called single slit diffraction. Using this ability, the wavelength of a certain light source, like laser, can be determined. This is through the working equation: = . Through the ...
... ABSTRACT: Being able to behave as a wave, light can be dispersed from its source point using slit/s. This is called single slit diffraction. Using this ability, the wavelength of a certain light source, like laser, can be determined. This is through the working equation: = . Through the ...
Raman spectroscopy of graphite - Institut für Festkörperphysik
... phonon wave vectors giving rise to the disorder-induced Raman bands are large compared with the extension of the Brillouin zone (Thomsen & Reich 2000). Thus, Raman scattering can be used to measure the phonon dispersion for wave vectors normally reserved to neutron or inelastic X-ray scattering, whi ...
... phonon wave vectors giving rise to the disorder-induced Raman bands are large compared with the extension of the Brillouin zone (Thomsen & Reich 2000). Thus, Raman scattering can be used to measure the phonon dispersion for wave vectors normally reserved to neutron or inelastic X-ray scattering, whi ...
Rayleigh scattering. Scattering and absorption by aerosols and
... ii) Particle is homogeneous (therefore it is characterized by a single refractive index m=n - ik at a given wavelength); NOTE: Mie theory requires the relative refractive index = refractive index of a particle/refractive index of a medium. But for air m is about 1, so one needs to know the refractiv ...
... ii) Particle is homogeneous (therefore it is characterized by a single refractive index m=n - ik at a given wavelength); NOTE: Mie theory requires the relative refractive index = refractive index of a particle/refractive index of a medium. But for air m is about 1, so one needs to know the refractiv ...
A nanometer notch filter with high rejection and throughput
... less than lo-nm bandwidth;lY2in the caseof ruby, the presence of two adjacent absorption lines (Rl and R2) limits the bandwidth to a few nanometers. Rejection based on grating spectrometers3can also be used but with a much lower throughput than available from amplitude division devices,such as Fabry ...
... less than lo-nm bandwidth;lY2in the caseof ruby, the presence of two adjacent absorption lines (Rl and R2) limits the bandwidth to a few nanometers. Rejection based on grating spectrometers3can also be used but with a much lower throughput than available from amplitude division devices,such as Fabry ...
Laser ranging: a critical review of usual techniques
... with angle encoders to enable the definition of the coordinates of the measurement point. Scanning is mechanical and is carried out manually or automatically. In some applications, manual scanning is adequate but for time-critical purposes a servo system is required to increase the measurement rate. ...
... with angle encoders to enable the definition of the coordinates of the measurement point. Scanning is mechanical and is carried out manually or automatically. In some applications, manual scanning is adequate but for time-critical purposes a servo system is required to increase the measurement rate. ...