Spatially resolved STIS Spectroscopy of Betelgeuse: Evidence for
... The spatial radial velocity structure of Betelgeuse’s chromosphere reveals opposite flow velocities of ∼2 km s−1 in 1998 September. These sub-sonic velocities indicate non-radial (or non-coherent) movements in the lower chromosphere during certain phases of the stellar pulsation cycle. This observat ...
... The spatial radial velocity structure of Betelgeuse’s chromosphere reveals opposite flow velocities of ∼2 km s−1 in 1998 September. These sub-sonic velocities indicate non-radial (or non-coherent) movements in the lower chromosphere during certain phases of the stellar pulsation cycle. This observat ...
Propagation and focusing of optical fields
... is always zero on the optical axis it shows two lobes to the sides of the optical axis. Displayed on a cross-section through the beam waist, the two lobes are aligned along the polarization direction. The longitudinal electric field of the Hermite-Gaussian (10) mode, on the other hand, has it’s maxi ...
... is always zero on the optical axis it shows two lobes to the sides of the optical axis. Displayed on a cross-section through the beam waist, the two lobes are aligned along the polarization direction. The longitudinal electric field of the Hermite-Gaussian (10) mode, on the other hand, has it’s maxi ...
more details
... 1. To identify a diode, an LED, a transistor, an IC, a resistor and a capacitor from a mixed collection of such items. 2. Use of multimeter to (i) identify base of transistor, (ii) distinguish between npn and pnp type transistors, (iii) see the unidirectional flow of current in case of a diode and a ...
... 1. To identify a diode, an LED, a transistor, an IC, a resistor and a capacitor from a mixed collection of such items. 2. Use of multimeter to (i) identify base of transistor, (ii) distinguish between npn and pnp type transistors, (iii) see the unidirectional flow of current in case of a diode and a ...
Levitated droplet dye laser
... on small volumes of samples, i.e. liquid droplets and particles. It suspends the object levitated in the nodal point of an ultrasonic standing wave, see Fig. 1(b). The technique was introduced in the 1930’s and does not rely on any specific properties of the sample except size and mass. The method h ...
... on small volumes of samples, i.e. liquid droplets and particles. It suspends the object levitated in the nodal point of an ultrasonic standing wave, see Fig. 1(b). The technique was introduced in the 1930’s and does not rely on any specific properties of the sample except size and mass. The method h ...
Intermittent measurement
... The principle of single wavelength monitoring is well described in Mac Leod’s book “Thin-Film Optical Filters”10. With state of the art single monitoring systems the variation of the transmission or reflectance at a selected single wavelength is measured with high accuracy on stationary test-glasses ...
... The principle of single wavelength monitoring is well described in Mac Leod’s book “Thin-Film Optical Filters”10. With state of the art single monitoring systems the variation of the transmission or reflectance at a selected single wavelength is measured with high accuracy on stationary test-glasses ...
ppt - Serbian Virtual Observatory - astronomical observatory belgrade
... of interest for abundance calculations, as well as for stellar atmospherae research, since the validity conditions are often satysfied for stellar plasma ...
... of interest for abundance calculations, as well as for stellar atmospherae research, since the validity conditions are often satysfied for stellar plasma ...
52.3: An Improved Polarizing Beamsplitter LCOS Projection
... the conductors to pass through the structure. This occurs because the electric field of the wave can generate no significant current in the conductors in this direction. The polarization parallel to the conductors, however, generates a current in the conductors and imparts energy to the conductors d ...
... the conductors to pass through the structure. This occurs because the electric field of the wave can generate no significant current in the conductors in this direction. The polarization parallel to the conductors, however, generates a current in the conductors and imparts energy to the conductors d ...
Systematic study of spontaneous emission in a two
... challenge is on how to calculate the LDOS of photons in a variety of PC structures. The most commonly adopted method is the plane-wave expansion algorithm [9]. This algorithm expands the electromagnetic field as the summation of plane waves and recasts Maxwell’s equations into an eigenvalue problem. ...
... challenge is on how to calculate the LDOS of photons in a variety of PC structures. The most commonly adopted method is the plane-wave expansion algorithm [9]. This algorithm expands the electromagnetic field as the summation of plane waves and recasts Maxwell’s equations into an eigenvalue problem. ...
Direct measurement of terahertz wavefront pulses using 2D electro
... Wavefront characterization of terahertz (THz) pulses is essential to optimize far-field intensity distribution or spot focalization, as well as increase the peak power of intense terahertz sources. In the visible spectral region, Hartmann masks, invented a century ago, are used to perform optical me ...
... Wavefront characterization of terahertz (THz) pulses is essential to optimize far-field intensity distribution or spot focalization, as well as increase the peak power of intense terahertz sources. In the visible spectral region, Hartmann masks, invented a century ago, are used to perform optical me ...
Lasers-An Overview
... 2. For continuous wave (CW) or repetitively pulsed lasers the average power output (Watts) and limiting exposure time inherent in the design are considered. 3. For pulsed lasers the total energy per pulse (Joule), pulse duration, pulse repetition frequency and emergent beam radiant exposure are cons ...
... 2. For continuous wave (CW) or repetitively pulsed lasers the average power output (Watts) and limiting exposure time inherent in the design are considered. 3. For pulsed lasers the total energy per pulse (Joule), pulse duration, pulse repetition frequency and emergent beam radiant exposure are cons ...
Introduction - BYU Physics and Astronomy
... deposition. In the second deposition, reflectance sample B, and a transmission sample, C, were coated side-by-side on the sample holder. The transmission sample consisted of Ru deposited on an ultrathin (~150nm) polyimide membrane provided to us by MOXTEK, Inc. These membranes are circular; about 1 ...
... deposition. In the second deposition, reflectance sample B, and a transmission sample, C, were coated side-by-side on the sample holder. The transmission sample consisted of Ru deposited on an ultrathin (~150nm) polyimide membrane provided to us by MOXTEK, Inc. These membranes are circular; about 1 ...
High resolution spectral self-interference fluorescence microscopy
... reflecting surface at such a large separation is demonstrated is Fig 2. by measuring the emission from a monolayer of fluorescein on a glass microscope slide as compared to the spectrum of a monolayer of fluorescein on a 5.052 µm thick SiO2 layer atop a silicon substrate that acts as a mirror. Note ...
... reflecting surface at such a large separation is demonstrated is Fig 2. by measuring the emission from a monolayer of fluorescein on a glass microscope slide as compared to the spectrum of a monolayer of fluorescein on a 5.052 µm thick SiO2 layer atop a silicon substrate that acts as a mirror. Note ...
Micro- and Nanotechnologies for Optical Neural Interfaces
... obtained by top-down fabrication process (Zorzos et al., 2010), with aluminum-coated multiple silicon oxynitride waveguides ending with corner mirrors to direct light laterally with respect to the implant direction. Each waveguide was coupled to external sources with single mode fibers, for overall ...
... obtained by top-down fabrication process (Zorzos et al., 2010), with aluminum-coated multiple silicon oxynitride waveguides ending with corner mirrors to direct light laterally with respect to the implant direction. Each waveguide was coupled to external sources with single mode fibers, for overall ...
Lokal fulltext - Chalmers Publication Library
... with a wide range of masses, in proportions approximated by the Salpeter initial mass function (IMF): N (m) ∝ m−2.35 , where N (m) is the number of stars of mass m (Salpeter, 1955). This means that low-mass stars are significantly more numerous than high-mass stars. For example, there are about 225 ...
... with a wide range of masses, in proportions approximated by the Salpeter initial mass function (IMF): N (m) ∝ m−2.35 , where N (m) is the number of stars of mass m (Salpeter, 1955). This means that low-mass stars are significantly more numerous than high-mass stars. For example, there are about 225 ...
Diode Laser Characteristics
... Figure 3. Schematic picture of the internal semiconductor stucture of some typical laser diodes. This view is looking into one facet of the laser cavity. population inversion is restricted to a narrow stripe in the active layer, so the laser’s optical gain is spatially localized (gain is the amount ...
... Figure 3. Schematic picture of the internal semiconductor stucture of some typical laser diodes. This view is looking into one facet of the laser cavity. population inversion is restricted to a narrow stripe in the active layer, so the laser’s optical gain is spatially localized (gain is the amount ...