Theoretical studies of frustrated magnets with dipolar interactions
... extent, such models are able to qualitatively expose many experimentally observed phenomena. But often, to account for complex behavior of magnetic matter, such models have to be refined by including more terms in Hamiltonian. The compound LiHox Y1−x F4 , by increasing concentration of nonmagnetic y ...
... extent, such models are able to qualitatively expose many experimentally observed phenomena. But often, to account for complex behavior of magnetic matter, such models have to be refined by including more terms in Hamiltonian. The compound LiHox Y1−x F4 , by increasing concentration of nonmagnetic y ...
Increasing the Resolution of Far
... the sample. For biological applications a typical resolution of 0.1 nm is obtained(8). Atomic resolution can be achieved in a high voltage transmission electron microscope for specimens thinner than 0.1 µm. In contrast to electron microscopes which are still based on focusing, scanning probe microsc ...
... the sample. For biological applications a typical resolution of 0.1 nm is obtained(8). Atomic resolution can be achieved in a high voltage transmission electron microscope for specimens thinner than 0.1 µm. In contrast to electron microscopes which are still based on focusing, scanning probe microsc ...
Propagation dynamics of optical vortices
... and thus we shall call it an r vortex. In the case of OVS’s or other localized cores, the amplitude can be modeled as tanh(r/wv), and we shall call this a tanh vortex. As the size of the tanh vortex vanishes (w v → 0) the vortex is said to become a point vortex. This paper was written to help develo ...
... and thus we shall call it an r vortex. In the case of OVS’s or other localized cores, the amplitude can be modeled as tanh(r/wv), and we shall call this a tanh vortex. As the size of the tanh vortex vanishes (w v → 0) the vortex is said to become a point vortex. This paper was written to help develo ...
3D LTE spectral line formation with scattering in red giant stars
... The physics of line formation involves many different processes that require a detailed treatment of the interaction between radiation and matter. Beside the transition itself, these processes include, e.g., Doppler-shifts through thermal and nonthermal particle motion, collisional interaction, photo ...
... The physics of line formation involves many different processes that require a detailed treatment of the interaction between radiation and matter. Beside the transition itself, these processes include, e.g., Doppler-shifts through thermal and nonthermal particle motion, collisional interaction, photo ...
"Fundamentals of Rotation--Vibration Spectra" in
... form, there are consequently no simple analytical expressions available for the energy levels or rovibrational term values except for model potentials. Thus, in practical spectroscopy, one uses approximations leading to simple formulae for the term values, which can be expressed by tables of constan ...
... form, there are consequently no simple analytical expressions available for the energy levels or rovibrational term values except for model potentials. Thus, in practical spectroscopy, one uses approximations leading to simple formulae for the term values, which can be expressed by tables of constan ...
Resonant-wavelength control and optical
... for models B and C moves toward the QWs, the effective-index step shifts toward the QWs and is no longer at the edge of the SCH cavity. This results in a smaller effective cavity and hence reduces . We have a competing effect for model B that has a linear grading. As increases, the slope of the line ...
... for models B and C moves toward the QWs, the effective-index step shifts toward the QWs and is no longer at the edge of the SCH cavity. This results in a smaller effective cavity and hence reduces . We have a competing effect for model B that has a linear grading. As increases, the slope of the line ...
Introduction to super-resolution microscopy
... different; however, the spatial resolution limits are similar for both. Figure 2a shows the image formation in wide-field fluorescence microscopy. The optical systems shown in Fig. 2 are schematic, but sufficient to show the limitation in the spatial resolution. In wide-field fluorescence microscopy, a s ...
... different; however, the spatial resolution limits are similar for both. Figure 2a shows the image formation in wide-field fluorescence microscopy. The optical systems shown in Fig. 2 are schematic, but sufficient to show the limitation in the spatial resolution. In wide-field fluorescence microscopy, a s ...
Broadband Sharp 90-degree Bends and T
... introduced by the bend or due to reflection and radiation loss at the bend. The measured transmittance is shown as a spectrum in Figure 3c. It shows that the transmittance approaches 100% as the wavelength increases. Especially, a transmittance of 97.5% is achieved for λ0 = 1.55 μm without any optimi ...
... introduced by the bend or due to reflection and radiation loss at the bend. The measured transmittance is shown as a spectrum in Figure 3c. It shows that the transmittance approaches 100% as the wavelength increases. Especially, a transmittance of 97.5% is achieved for λ0 = 1.55 μm without any optimi ...
Chapter 5: Optical aberrations in the mouse eye
... were for 1.5-mm pupils. Hartmann-Shack refractions were consistently hyperopic (10.12 ± 1.4 1 D, mean and standard deviation) and astigmatism was present in many of the eyes (3.64 ± 3.70 D, on average). Spherical aberration was positive in all eyes (0.15 ± 0.07 µm) and coma terms RMS were significan ...
... were for 1.5-mm pupils. Hartmann-Shack refractions were consistently hyperopic (10.12 ± 1.4 1 D, mean and standard deviation) and astigmatism was present in many of the eyes (3.64 ± 3.70 D, on average). Spherical aberration was positive in all eyes (0.15 ± 0.07 µm) and coma terms RMS were significan ...
Laser Cooling and Trapping of Metastable Neon and Applications to
... The first laser cooling experiments involved the cooling of trapped ions by both Wineland et al. [7] with Mg+ ions and Neuhauser et al. [8] with Ba+ ions in 1978. The first experiment demonstrating laser cooling of neutral atoms was performed at Moscow’s Institute for Spectroscopy in 1981 with Na [9 ...
... The first laser cooling experiments involved the cooling of trapped ions by both Wineland et al. [7] with Mg+ ions and Neuhauser et al. [8] with Ba+ ions in 1978. The first experiment demonstrating laser cooling of neutral atoms was performed at Moscow’s Institute for Spectroscopy in 1981 with Na [9 ...
Applications of spatial light modulators for optical trapping and
... Generally, the forces on microparticles emerging in optical traps depend on the polarization state of light. This circumstance originates on one hand from the Fresnel coefficients describing reflection and transmission, which are polarization dependent. On the other hand, it is also the light intens ...
... Generally, the forces on microparticles emerging in optical traps depend on the polarization state of light. This circumstance originates on one hand from the Fresnel coefficients describing reflection and transmission, which are polarization dependent. On the other hand, it is also the light intens ...
The Michelson Interferometer Wavelength Meter
... For a DFB laser, the two signals arriving at the photodetector have a well-defined phase relationship resulting in a strong interference signal even for wide ranges of the variable mirror position For the LED source, the phase relationship between the two signals stars to become random as the path-l ...
... For a DFB laser, the two signals arriving at the photodetector have a well-defined phase relationship resulting in a strong interference signal even for wide ranges of the variable mirror position For the LED source, the phase relationship between the two signals stars to become random as the path-l ...
The Scintillation Index In Moderate To Strong Turbulence
... scintillation are expected to have a high degree of correlation. ...
... scintillation are expected to have a high degree of correlation. ...
Bessel beams: diffraction in a new light
... minimum diameter of 34l with l being the beam wavelength [1]) which did not spread. Of course the reality is a little more down to earth. A Bessel beam gets its name from the description of such a beam using a Bessel function, and this leads to a predicted cross-sectional profile of a set of concentr ...
... minimum diameter of 34l with l being the beam wavelength [1]) which did not spread. Of course the reality is a little more down to earth. A Bessel beam gets its name from the description of such a beam using a Bessel function, and this leads to a predicted cross-sectional profile of a set of concentr ...
DFB Quantum Cascade Laser Arrays The Harvard community has
... Fig. 2. (a) Schematic of the DFB-QCL waveguide structure. The grating is etched in an InGaAs layer (blue) in the top waveguide cladding, just above the active region (red). There is InP overgrown on top of the grating (yellow in diagram). (b) Mode simulation of the mode on the low-frequency side of ...
... Fig. 2. (a) Schematic of the DFB-QCL waveguide structure. The grating is etched in an InGaAs layer (blue) in the top waveguide cladding, just above the active region (red). There is InP overgrown on top of the grating (yellow in diagram). (b) Mode simulation of the mode on the low-frequency side of ...
S282_2 Introduction to active galaxies
... to absorb starlight. However, dust can emit strongly at farinfrared wavelengths (λ of about 100 μm). As a rule, optical absorption lines result from stars, and optical emission lines result from hot gas. The spectra of stars and HII regions extend far beyond the optical region. The Sun, for example, ...
... to absorb starlight. However, dust can emit strongly at farinfrared wavelengths (λ of about 100 μm). As a rule, optical absorption lines result from stars, and optical emission lines result from hot gas. The spectra of stars and HII regions extend far beyond the optical region. The Sun, for example, ...
Final report
... Figure 17: Precise alignment using tapered lens fibre for direct injection from bent section. ..... 27 Figure 18: Image of light coupling by injecting light through a bent section. Red bright dot at the end indicates light exiting the silk fibre. ..................................................... ...
... Figure 17: Precise alignment using tapered lens fibre for direct injection from bent section. ..... 27 Figure 18: Image of light coupling by injecting light through a bent section. Red bright dot at the end indicates light exiting the silk fibre. ..................................................... ...
The UKIRT Infrared Deep Sky Survey ZY JHK Photometric System
... thus differential in nature and mimics the procedure undertaken when performing actual photometric observations, calibrated by observations of standard stars. The shape of the throughput function is the key element in the calculation, although, for all but the most pathological of target SEDs, error ...
... thus differential in nature and mimics the procedure undertaken when performing actual photometric observations, calibrated by observations of standard stars. The shape of the throughput function is the key element in the calculation, although, for all but the most pathological of target SEDs, error ...