DIOPTRICS OF THE FACET LENSES OF MALE BLOWFLIES
... water with refractive index nw has the same effect as adding a contact lens with power (nw-1)/ro. In the thin lens approximation, the power of the facet lens can then be calculated from P = (nw- 1)/ro + 1/rp. Hence, the focal distance (in air), f = 1/P, can be directly calculated from the data of ro ...
... water with refractive index nw has the same effect as adding a contact lens with power (nw-1)/ro. In the thin lens approximation, the power of the facet lens can then be calculated from P = (nw- 1)/ro + 1/rp. Hence, the focal distance (in air), f = 1/P, can be directly calculated from the data of ro ...
Multi-photon absorption and third-order
... clarify, the α0 is the linear absorption coefficient with wavelength dispersion, which is negligibly small at mid-IR wavelengths. Therefore, the effective path length at α0 0+ is approximately identical to the L (thickness of the sample). In this case, the beam waist ω0 ranged from 38 to 123 µm for ...
... clarify, the α0 is the linear absorption coefficient with wavelength dispersion, which is negligibly small at mid-IR wavelengths. Therefore, the effective path length at α0 0+ is approximately identical to the L (thickness of the sample). In this case, the beam waist ω0 ranged from 38 to 123 µm for ...
Optics for next generation light sources Anton Barty
... SOMS system (dashed line). Because metrology data are not yet available for the AMO focusing optics this calculation likely places an upper bound on the focusing spot properties given the predicted SOMS front-end performance. One point that is immediately apparent is that the focal spot is likely t ...
... SOMS system (dashed line). Because metrology data are not yet available for the AMO focusing optics this calculation likely places an upper bound on the focusing spot properties given the predicted SOMS front-end performance. One point that is immediately apparent is that the focal spot is likely t ...
Effect of ABCD transformations on beam paraxiality
... The concept of paraxiality applied to optical beams refers to how accurate is the paraxial approximation (PA) for describing the propagation of a light beam through a given optical system. The ondulatory foundation of the PA is based on the assumption that the complex amplitude of the field slowly v ...
... The concept of paraxiality applied to optical beams refers to how accurate is the paraxial approximation (PA) for describing the propagation of a light beam through a given optical system. The ondulatory foundation of the PA is based on the assumption that the complex amplitude of the field slowly v ...
Optical Comms 2004 (Summer)
... Overall then it is apparent that there is significant trade-off between a high acceptance angle and a large fibre bandwidth. The impact of this trade-off in an actual optical fibre system is important, for good coupling efficiency for optical sources such as lasers or particularly LEDs a high fibre ...
... Overall then it is apparent that there is significant trade-off between a high acceptance angle and a large fibre bandwidth. The impact of this trade-off in an actual optical fibre system is important, for good coupling efficiency for optical sources such as lasers or particularly LEDs a high fibre ...
High resolution, high contrast, high focal depth nonlinear beams
... extend far from the peak. Consequently, the overall wave packet does not behave as a genuine localized wave, but rather as an extended wave. Thus, for example, if a Bessel beam is used for linear microscopy, owing to its non-diffractive property, very small objects deep inside a thick transparent sa ...
... extend far from the peak. Consequently, the overall wave packet does not behave as a genuine localized wave, but rather as an extended wave. Thus, for example, if a Bessel beam is used for linear microscopy, owing to its non-diffractive property, very small objects deep inside a thick transparent sa ...
Sep 25
... But: “Pure” (geometrical) optical systems would require components much larger than λ. In sub- /mm range diffraction is important, and quasi-optics handles this in a theorectical way. ...
... But: “Pure” (geometrical) optical systems would require components much larger than λ. In sub- /mm range diffraction is important, and quasi-optics handles this in a theorectical way. ...
C-Point singularities in Poincare beams
... a field of ellipses whose semi-major axis rotates about the C-point. This divides the C-points into two classes: those that rotate with the angular coordinate about the C-point, and those that rotate counter to it. An index representing this rotation about the C-point is IC . Since ellipses’ axes ar ...
... a field of ellipses whose semi-major axis rotates about the C-point. This divides the C-points into two classes: those that rotate with the angular coordinate about the C-point, and those that rotate counter to it. An index representing this rotation about the C-point is IC . Since ellipses’ axes ar ...
Airy disk
In optics, the Airy disk (or Airy disc) and Airy pattern are descriptions of the best focused spot of light that a perfect lens with a circular aperture can make, limited by the diffraction of light. The Airy disk is of importance in physics, optics, and astronomy.The diffraction pattern resulting from a uniformly-illuminated circular aperture has a bright region in the center, known as the Airy disk which together with the series of concentric bright rings around is called the Airy pattern. Both are named after George Biddell Airy. The disk and rings phenomenon had been known prior to Airy; John Herschel described the appearance of a bright star seen through a telescope under high magnification for an 1828 article on light for the Encyclopedia Metropolitana:...the star is then seen (in favourable circumstances of tranquil atmosphere, uniform temperature, &c.) as a perfectly round, well-defined planetary disc, surrounded by two, three, or more alternately dark and bright rings, which, if examined attentively, are seen to be slightly coloured at their borders. They succeed each other nearly at equal intervals round the central disc....However, Airy wrote the first full theoretical treatment explaining the phenomenon (his 1835 ""On the Diffraction of an Object-glass with Circular Aperture"").Mathematically, the diffraction pattern is characterized by the wavelength of light illuminating the circular aperture, and the aperture's size. The appearance of the diffraction pattern is additionally characterized by the sensitivity of the eye or other detector used to observe the pattern.The most important application of this concept is in cameras and telescopes. Owing to diffraction, the smallest point to which a lens or mirror can focus a beam of light is the size of the Airy disk. Even if one were able to make a perfect lens, there is still a limit to the resolution of an image created by this lens. An optical system in which the resolution is no longer limited by imperfections in the lenses but only by diffraction is said to be diffraction limited.