Optical Fibre Communications
... — "Theoretical and experimental studies indicate that a fibre of glassy material ... cladded structure with a core ....and an overall diameter of about 100 l represents a practical waveguide with important potential as a new form of communication medium.” • The Loss: — "The realisation of a successf ...
... — "Theoretical and experimental studies indicate that a fibre of glassy material ... cladded structure with a core ....and an overall diameter of about 100 l represents a practical waveguide with important potential as a new form of communication medium.” • The Loss: — "The realisation of a successf ...
Profilometer - Department of Mechanical Engineering
... • A light beam is split, reflecting from reference (known/flat) & test material. ...
... • A light beam is split, reflecting from reference (known/flat) & test material. ...
Two-dimensional modulational instability in photorefractive media M Saffman , Glen McCarthy
... The cancellation of the growth rate can be attributed to a destructive interference of the drift and diffusional parts of the nonlinearity. Additional analysis shows that cancellation occurs for negative when E ph is sufficiently large. Finally, we note that the angular dependence takes on a simpl ...
... The cancellation of the growth rate can be attributed to a destructive interference of the drift and diffusional parts of the nonlinearity. Additional analysis shows that cancellation occurs for negative when E ph is sufficiently large. Finally, we note that the angular dependence takes on a simpl ...
Graded-index fibers (GRA)
... Figure 5.3: WKB-solution for the problem (a) with one turning point and (b) with two turning points (Illustration taken from: Timmermann, Lichtwellenleiter) where A, B and C in eq. (5.11), eq. (5.12) and eq. (5.13) designate constants. In order for eq. (5.11) and eq. (5.12), as well as eq. (5.12) an ...
... Figure 5.3: WKB-solution for the problem (a) with one turning point and (b) with two turning points (Illustration taken from: Timmermann, Lichtwellenleiter) where A, B and C in eq. (5.11), eq. (5.12) and eq. (5.13) designate constants. In order for eq. (5.11) and eq. (5.12), as well as eq. (5.12) an ...
High-Resolution Retinal Imaging using Adaptive Optics in a
... A significant part of this eye research deals with, or benefits from, being able to image the different structures of the eye; this includes the retina which is the focus of the work being presented in this thesis. The eye, however, is an organ designed to look out and not to be looked into, and we ...
... A significant part of this eye research deals with, or benefits from, being able to image the different structures of the eye; this includes the retina which is the focus of the work being presented in this thesis. The eye, however, is an organ designed to look out and not to be looked into, and we ...
Chapter 2.1 - Focusing Fundamentals
... Precise, accurate focusing is critical to success. Unfortunately, focusing any astro camera requires a little more work than focusing an ordinary camera. When you are taking a snapshot of the Grand Canyon, you have plenty of light to work with while you focus, and so does the automatic focuser found ...
... Precise, accurate focusing is critical to success. Unfortunately, focusing any astro camera requires a little more work than focusing an ordinary camera. When you are taking a snapshot of the Grand Canyon, you have plenty of light to work with while you focus, and so does the automatic focuser found ...
6.1 Characteristics Because VCSELs emit from the top surface of the
... attenuation less than 20 dB/km: this was the necessary threshold to make fiber optics a viable transmission technology. The silica-based optical fiber structure consists of a cladding layer with a lower refractive index than the fiber core it surrounds. This refractive index difference causes a tota ...
... attenuation less than 20 dB/km: this was the necessary threshold to make fiber optics a viable transmission technology. The silica-based optical fiber structure consists of a cladding layer with a lower refractive index than the fiber core it surrounds. This refractive index difference causes a tota ...
of optical-fiber dispersion
... the dispersion-delay characteristic to provide a more linear dispersion-delay response. This is shown in Fig. 4, which illustrates the calculated reflection response and dispersion-delay response of a linearly chirped Bragg grating that has been apodized. In this case, AO= 1550 nm, L = 3.0 cm, KL = ...
... the dispersion-delay characteristic to provide a more linear dispersion-delay response. This is shown in Fig. 4, which illustrates the calculated reflection response and dispersion-delay response of a linearly chirped Bragg grating that has been apodized. In this case, AO= 1550 nm, L = 3.0 cm, KL = ...
to Thin Section Microscopy - Mineralogical Society of America
... systems of lenses. The first lens system (objective) produces a magnified image of the object. This real image is viewed by the second lens system (ocular or eyepiece) that also provides further magnification. 1.1.1 Imaging by a converging lens (objective) Optical images of an object are formed by c ...
... systems of lenses. The first lens system (objective) produces a magnified image of the object. This real image is viewed by the second lens system (ocular or eyepiece) that also provides further magnification. 1.1.1 Imaging by a converging lens (objective) Optical images of an object are formed by c ...
ALMA Newsletter N°5
... a small angle will be focused at a slightly different location on the CCD or photographic plate. We can distinguish it only from the on-axis source if this difference in locations is larger than the size of the diffraction pattern of the two sources. In the opposite case, the two diffraction pattern ...
... a small angle will be focused at a slightly different location on the CCD or photographic plate. We can distinguish it only from the on-axis source if this difference in locations is larger than the size of the diffraction pattern of the two sources. In the opposite case, the two diffraction pattern ...
Optical Wavefront Sensing and Control
... been developed during the late 1930s and 1940s as a projection display technology. H.W. Babcock, “The possibility of compensating atmospheric seeing,” Publ. Astron. Soc. Pacific., 65(386): ...
... been developed during the late 1930s and 1940s as a projection display technology. H.W. Babcock, “The possibility of compensating atmospheric seeing,” Publ. Astron. Soc. Pacific., 65(386): ...
Aalborg Universitet Near-field electrospinning of dielectric-loaded surface plasmon polariton waveguides
... plasmons. Various waveguiding structures for surface plasmons, fabricated with different techniques, such as metal stripes [3–5] and v-grooves [6,7] have already been investigated. The strong lateral confinement can be also achieved by depositing polymer stripes on a metal surface and using them as ...
... plasmons. Various waveguiding structures for surface plasmons, fabricated with different techniques, such as metal stripes [3–5] and v-grooves [6,7] have already been investigated. The strong lateral confinement can be also achieved by depositing polymer stripes on a metal surface and using them as ...
Optical aberration
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An optical aberration is a departure of the performance of an optical system from the predictions of paraxial optics. In an imaging system, it occurs when light from one point of an object does not converge into (or does not diverge from) a single point after transmission through the system. Aberrations occur because the simple paraxial theory is not a completely accurate model of the effect of an optical system on light, rather than due to flaws in the optical elements.Aberration leads to blurring of the image produced by an image-forming optical system. Makers of optical instruments need to correct optical systems to compensate for aberration.The articles on reflection, refraction and caustics discuss the general features of reflected and refracted rays.