Generating Single Photons on Demand I Vladan Vuletic
... (see Figure 2), the grating will wash out and collective emission will not occur. Thus the entangled many-body state has a finite lifetime that depends on the temperature of the atoms and the chosen beam geometry. The single photon must be generated within a certain time after the source has been arm ...
... (see Figure 2), the grating will wash out and collective emission will not occur. Thus the entangled many-body state has a finite lifetime that depends on the temperature of the atoms and the chosen beam geometry. The single photon must be generated within a certain time after the source has been arm ...
3011800000631
... dim isolated thermally emitting neutron stars (DINs) have rotation periods all in the same narrow range P = 3−12 s, giving rotation rates Ω ~ O(1)? As Psaltis and Miller (2002) have shown, dipole spindown (braking index n = 3) or spindown with any other power law index in the range n = 2−4, can prod ...
... dim isolated thermally emitting neutron stars (DINs) have rotation periods all in the same narrow range P = 3−12 s, giving rotation rates Ω ~ O(1)? As Psaltis and Miller (2002) have shown, dipole spindown (braking index n = 3) or spindown with any other power law index in the range n = 2−4, can prod ...
Galaxies Astronomy 1 — Elementary Astronomy LA Mission College Spring F2015
... Astronomy 1 — Elementary Astronomy LA Mission College Spring F2015 ...
... Astronomy 1 — Elementary Astronomy LA Mission College Spring F2015 ...
Mark scheme - Unit A183/02 - Module P7 - Higher tier
... Correctly links frequency/wavelength to colour (1) allow 1 mark for correct link between temperature and colour Accept correct reference to photon energies ...
... Correctly links frequency/wavelength to colour (1) allow 1 mark for correct link between temperature and colour Accept correct reference to photon energies ...
The Time Evolution of Faculae and Plage
... terms of brightness temperature as a function of wavelength. Irradiance increases with decreasing solar activity if the temperature brightness is greater than the effective temperature (Teff) of the sun, defined to be the temperature of a black body that produces the TSI of 1361 Wm-2 at 1 AU. Likewise, ...
... terms of brightness temperature as a function of wavelength. Irradiance increases with decreasing solar activity if the temperature brightness is greater than the effective temperature (Teff) of the sun, defined to be the temperature of a black body that produces the TSI of 1361 Wm-2 at 1 AU. Likewise, ...
Light Measurement Handbook
... segment of the UV spectrum. The harmful effect at 270 nm is two times greater than at the 254 and 297 nm mercury lines, and 9000 times greater than at the 365 nm mercury line. The outlying extremes of the bandwidth are important to consider as well. If, for example, you are trying to assess the effe ...
... segment of the UV spectrum. The harmful effect at 270 nm is two times greater than at the 254 and 297 nm mercury lines, and 9000 times greater than at the 365 nm mercury line. The outlying extremes of the bandwidth are important to consider as well. If, for example, you are trying to assess the effe ...
Swift and NuSTAR observations of XTE J1859+083
... or solid state, a neutron star with a characteristic size of R ≈ 10 km and a mass between 1.44 and 3 M . Core masses above 3 M lead to the same supernova mechanism but leave a black hole instead of a NS. The rapid decrease of the radius leads to extreme conditions. Because of angular momentum con ...
... or solid state, a neutron star with a characteristic size of R ≈ 10 km and a mass between 1.44 and 3 M . Core masses above 3 M lead to the same supernova mechanism but leave a black hole instead of a NS. The rapid decrease of the radius leads to extreme conditions. Because of angular momentum con ...
CHAPTER 1 Wave Nature of Light
... • To obtain stimulated emission, the incoming photon should not be absorbed by another atom at E1. • We must have the majority of the atoms at the energy level E2. • When there are more atoms at E2 than at E1 we then have what is called a population inversion. • With only two levels we can never ach ...
... • To obtain stimulated emission, the incoming photon should not be absorbed by another atom at E1. • We must have the majority of the atoms at the energy level E2. • When there are more atoms at E2 than at E1 we then have what is called a population inversion. • With only two levels we can never ach ...
Cluster formation in molecular clouds – I. Stellar populations, star
... Galactic H II regions (Chomiuk & Povich 2011). The mass of G29.960.02, a star-forming region in the Milky Way, is given as 8 × 104 M (Beltran et al. 2013) which will be a useful comparison to our models. Our model will also be compared to the more massive (≈3 × 105 M ) G305 star-forming cloud, lo ...
... Galactic H II regions (Chomiuk & Povich 2011). The mass of G29.960.02, a star-forming region in the Milky Way, is given as 8 × 104 M (Beltran et al. 2013) which will be a useful comparison to our models. Our model will also be compared to the more massive (≈3 × 105 M ) G305 star-forming cloud, lo ...
THE BASIC PRINCIPLES OF LASER TECHNOLOGY, USES AND
... The laser is usually named according to the type of lasing medium. This also determines the type of pump required and the wavelength of the laser light which is produced. Principle of operation at atomic level (Figures 2 and 3) One model in atomic physics describes an atom as a central nucleus of pr ...
... The laser is usually named according to the type of lasing medium. This also determines the type of pump required and the wavelength of the laser light which is produced. Principle of operation at atomic level (Figures 2 and 3) One model in atomic physics describes an atom as a central nucleus of pr ...
A Carpet Cloak Device for Visible Light
... top surface. The porosity of this network is increased by oxidizing several atomic layers of silicon on the internal surfaces at 300°C and subsequently removing this oxide layer by selective etching. By repeating the oxidation and etching several times, the solid silicon is slowly consumed, leaving ...
... top surface. The porosity of this network is increased by oxidizing several atomic layers of silicon on the internal surfaces at 300°C and subsequently removing this oxide layer by selective etching. By repeating the oxidation and etching several times, the solid silicon is slowly consumed, leaving ...
Investigation of the Optical Properties of YAG:Ce Phosphor
... In a phosphor-converted white LED package, the backward yellow light will return to the phosphor layer after being reflected from the different components within the LED package. In this case, it is not known what will happen to the yellow light when it strikes the phosphor medium. To the best of ou ...
... In a phosphor-converted white LED package, the backward yellow light will return to the phosphor layer after being reflected from the different components within the LED package. In this case, it is not known what will happen to the yellow light when it strikes the phosphor medium. To the best of ou ...
special - Carl Zeiss
... thousands of years, we have attempted to interpret and understand the inner workings of the heavens. Our knowledge of how and why has been increasing for hundreds of years. In the beginning, man simply observed the light from the stars and attributed laws to it. The first optical instruments provide ...
... thousands of years, we have attempted to interpret and understand the inner workings of the heavens. Our knowledge of how and why has been increasing for hundreds of years. In the beginning, man simply observed the light from the stars and attributed laws to it. The first optical instruments provide ...
M.Sc. PHYSICAL CHEMISTRY
... To understand the mathematical foundations and selection rules of different branches of spectroscopy. (iii) To apply the principles of spectroscopy for the structural determination of molecules UNIT I Physical Principles of Spectroscopy Introduction to electromagnetic radiation and its interaction w ...
... To understand the mathematical foundations and selection rules of different branches of spectroscopy. (iii) To apply the principles of spectroscopy for the structural determination of molecules UNIT I Physical Principles of Spectroscopy Introduction to electromagnetic radiation and its interaction w ...
Star Testing Your Telescope - Backyard Astronomer`s Guide
... rack the star out of focus. You’ll see an expanding pattern of rings emerge. Defocus the instrument to the point where four to six rings show. Except for a fat outer ring, the light should be spread more or less uniformly among the rings. Now, rack through focus to the same place on the other side o ...
... rack the star out of focus. You’ll see an expanding pattern of rings emerge. Defocus the instrument to the point where four to six rings show. Except for a fat outer ring, the light should be spread more or less uniformly among the rings. Now, rack through focus to the same place on the other side o ...
A New Assessment of Dark Matter in the Milky Way Galaxy
... from the rates predicted based on the observable luminous masses of the galaxies. This simple observation has led to the proposition that large amounts of invisible matter, known as dark matter, are distributed within and around these galaxies, accounting for the greater gravity and thus faster rota ...
... from the rates predicted based on the observable luminous masses of the galaxies. This simple observation has led to the proposition that large amounts of invisible matter, known as dark matter, are distributed within and around these galaxies, accounting for the greater gravity and thus faster rota ...
Document
... the validity was checked by Monte Carlo simulations and by L-D (luminositydiameter) dependences (Urošević et al. 2005, Arbutina et al. 2004) - also, this relation is appropriate for determination of distances to SNRs (Arbutina et al. 2004) ...
... the validity was checked by Monte Carlo simulations and by L-D (luminositydiameter) dependences (Urošević et al. 2005, Arbutina et al. 2004) - also, this relation is appropriate for determination of distances to SNRs (Arbutina et al. 2004) ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.