Experimental observation of speckle instability in Kerr random
... In a disordered medium, the transmitted intensity measured at a point results from the interference of light incoming from all possible scattering trajectories inside the medium. These constructive and destructive interferences give rise to intensity fluctuations [1]. The resulting speckle pattern o ...
... In a disordered medium, the transmitted intensity measured at a point results from the interference of light incoming from all possible scattering trajectories inside the medium. These constructive and destructive interferences give rise to intensity fluctuations [1]. The resulting speckle pattern o ...
Cost-effective optical coherence tomography spectrometer based on
... maintenance, high resolution instruments. An approach to miniaturize devices and thereby increase their stability is to combine functionalities of different optical components into one, such as with classic concave gratings that integrate the grating with the focusing element [1] or arrayed wave gui ...
... maintenance, high resolution instruments. An approach to miniaturize devices and thereby increase their stability is to combine functionalities of different optical components into one, such as with classic concave gratings that integrate the grating with the focusing element [1] or arrayed wave gui ...
Development of an Orbital Angular Momentum Sorter for High
... mathematically modelled to better understand its vortex generation capability. The phase plate is useful even outside the context of this project in that it costs essentially nothing and is 100% efficient, features which may be decisive in applications such as optical tweezers. Second, a composite g ...
... mathematically modelled to better understand its vortex generation capability. The phase plate is useful even outside the context of this project in that it costs essentially nothing and is 100% efficient, features which may be decisive in applications such as optical tweezers. Second, a composite g ...
Spectroscopy – I. Gratings and Prisms
... If we could see the whole spectrum (radio to γ–ray), then every order would completely overlap with every other order. In reality, of course, many effects limit what we can see/measure. For example, the atmosphere will eliminate most photons at shorter wavelengths than about 340nm – as well as large ...
... If we could see the whole spectrum (radio to γ–ray), then every order would completely overlap with every other order. In reality, of course, many effects limit what we can see/measure. For example, the atmosphere will eliminate most photons at shorter wavelengths than about 340nm – as well as large ...
Nonlinear optical responses and gap
... We will assume the simplest case of an exponentially decreasing interaction between single dielectric layers i.e. Jm−n = Jo e−λ|m−n| [12]. Since the problem cannot be efficiently treated by anlytical means, we followed a numerical approach. Figs. 5, 6, 7 and 8 are shapes of the light intensity on a ...
... We will assume the simplest case of an exponentially decreasing interaction between single dielectric layers i.e. Jm−n = Jo e−λ|m−n| [12]. Since the problem cannot be efficiently treated by anlytical means, we followed a numerical approach. Figs. 5, 6, 7 and 8 are shapes of the light intensity on a ...
Measuring amplitude and phase of light emerging from
... Amplitude and phase fields of light emerging from periodic structures, although considered by many researchers, are still an interesting subject of research. Talbot observed the self-imaging effect of a periodic structure in 18364. Later, Lord Rayleigh showed that its origin is the interference of t ...
... Amplitude and phase fields of light emerging from periodic structures, although considered by many researchers, are still an interesting subject of research. Talbot observed the self-imaging effect of a periodic structure in 18364. Later, Lord Rayleigh showed that its origin is the interference of t ...
Optical Comms 2004 (Summer)
... This in turn opens up transmission at wavelengths circa 1400 nm and 1000 nm, which have not been utilised to date. Scattering Loss: Scattering is a process whereby all or some of the optical power in a mode is transferred into another mode. This frequently causes attenuation, since the transfer is o ...
... This in turn opens up transmission at wavelengths circa 1400 nm and 1000 nm, which have not been utilised to date. Scattering Loss: Scattering is a process whereby all or some of the optical power in a mode is transferred into another mode. This frequently causes attenuation, since the transfer is o ...
Mirrors
... A spherical mirror is a segment of a spherical surface that has been coated with specular reflecting material. See Figure 25.10 on page 788 in your text. The center of the sphere of which the mirror is a segment is called the center of curvature of the mirror. This is denoted by C. The radius of the ...
... A spherical mirror is a segment of a spherical surface that has been coated with specular reflecting material. See Figure 25.10 on page 788 in your text. The center of the sphere of which the mirror is a segment is called the center of curvature of the mirror. This is denoted by C. The radius of the ...
Spherical Mirrors
... A spherical mirror is a segment of a spherical surface that has been coated with specular reflecting material. See Figure 25.10 on page 788 in your text. The center of the sphere of which the mirror is a segment is called the center of curvature of the mirror. This is denoted by C. The radius of the ...
... A spherical mirror is a segment of a spherical surface that has been coated with specular reflecting material. See Figure 25.10 on page 788 in your text. The center of the sphere of which the mirror is a segment is called the center of curvature of the mirror. This is denoted by C. The radius of the ...
Monolithic integration of optical waveguide and
... diffraction, the actual width of the waveguide is roughly 67μm. This pattern blurring leads to a gradient index response at the edges of the waveguide, which is useful in reducing edge scatter in the waveguide. The dimensions of the polymer waveguide were chosen to approximate the dimensions of the ...
... diffraction, the actual width of the waveguide is roughly 67μm. This pattern blurring leads to a gradient index response at the edges of the waveguide, which is useful in reducing edge scatter in the waveguide. The dimensions of the polymer waveguide were chosen to approximate the dimensions of the ...
geometrical optics
... Discussion An optical lens is a piece of glass or other transparent material used to direct or control rays of light. The refraction of light at the surface of a lens depends on its shape, its index of refraction, and the nature of the medium surrounding it (usually air), in accordance with Snell’s ...
... Discussion An optical lens is a piece of glass or other transparent material used to direct or control rays of light. The refraction of light at the surface of a lens depends on its shape, its index of refraction, and the nature of the medium surrounding it (usually air), in accordance with Snell’s ...
Resonant-Cavity Light-Emitting Diodes: a review
... High radiance, modulation capabilities, spectral purity and efficiency are no longer exclusively attributed to lasers. Since the invention and first demonstration1 in 1992 of the Resonant-Cavity LED (RCLED) which uses photon quantisation in microcavities to enhance spontaneous emission properties, d ...
... High radiance, modulation capabilities, spectral purity and efficiency are no longer exclusively attributed to lasers. Since the invention and first demonstration1 in 1992 of the Resonant-Cavity LED (RCLED) which uses photon quantisation in microcavities to enhance spontaneous emission properties, d ...
Lecture 7: Optical Characterization of Inorganic - CDT-PV
... • Thickness of absorber required is determined by absorption coefficient • Absorption coefficient is not straightforward to obtain from T and R • Direct band gap significantly better than indirect for PV absorber • Temp. dependence of band gap influences efficiency mainly via VOC and low temp. absor ...
... • Thickness of absorber required is determined by absorption coefficient • Absorption coefficient is not straightforward to obtain from T and R • Direct band gap significantly better than indirect for PV absorber • Temp. dependence of band gap influences efficiency mainly via VOC and low temp. absor ...
Accelerating Light Beams along Arbitrary Convex
... Eq. (6), the curve x ¼ fðzÞ is the envelope of rays tangent to all members of the ray family leaving the mask, and therefore a caustic [15]. Since a caustic is a manifold on which rays focus to a maximum extent, it is not surprising that the optical intensity juðx; zÞj2 has a global maximum there. T ...
... Eq. (6), the curve x ¼ fðzÞ is the envelope of rays tangent to all members of the ray family leaving the mask, and therefore a caustic [15]. Since a caustic is a manifold on which rays focus to a maximum extent, it is not surprising that the optical intensity juðx; zÞj2 has a global maximum there. T ...
Optics - Filter Properties & manipulation of light in flow cytometry
... ©1990-2005 J.Paul Robinson, Purdue University BMS 631 – LECTURE00007.PPT ...
... ©1990-2005 J.Paul Robinson, Purdue University BMS 631 – LECTURE00007.PPT ...
Anti-reflective coating
An antireflective or anti-reflection (AR) coating is a type of optical coating applied to the surface of lenses and other optical elements to reduce reflection. In typical imaging systems, this improves the efficiency since less light is lost. In complex systems such as a telescope, the reduction in reflections also improves the contrast of the image by elimination of stray light. This is especially important in planetary astronomy. In other applications, the primary benefit is the elimination of the reflection itself, such as a coating on eyeglass lenses that makes the eyes of the wearer more visible to others, or a coating to reduce the glint from a covert viewer's binoculars or telescopic sight.Many coatings consist of transparent thin film structures with alternating layers of contrasting refractive index. Layer thicknesses are chosen to produce destructive interference in the beams reflected from the interfaces, and constructive interference in the corresponding transmitted beams. This makes the structure's performance change with wavelength and incident angle, so that color effects often appear at oblique angles. A wavelength range must be specified when designing or ordering such coatings, but good performance can often be achieved for a relatively wide range of frequencies: usually a choice of IR, visible, or UV is offered.