Tuneable, stabilised diode lasers for compact atomic frequency
... 894 nm: We also envisage a modification of the module to meet the Rb 2-photon transition at 778 nm; which is recommended as a metrology reference wavelength [1]. The implementation of frequency doubling techniques allows to extend the wavelength range met by the laser module to 1556 or 1560 nm; and t ...
... 894 nm: We also envisage a modification of the module to meet the Rb 2-photon transition at 778 nm; which is recommended as a metrology reference wavelength [1]. The implementation of frequency doubling techniques allows to extend the wavelength range met by the laser module to 1556 or 1560 nm; and t ...
Laser hazard control checklist
... 1.3.3 Good room lighting is important in areas where laser eye protection is worn. Light coloured diffuse wall surfaces help to achieve this condition. Is good room lighting provided where laser eye protection is worn? Are light coloured diffuse wall surfaces also provided for the room? 1.3.4 Fire, ...
... 1.3.3 Good room lighting is important in areas where laser eye protection is worn. Light coloured diffuse wall surfaces help to achieve this condition. Is good room lighting provided where laser eye protection is worn? Are light coloured diffuse wall surfaces also provided for the room? 1.3.4 Fire, ...
Document
... disturbance in hypothetical medium called ether. The disturbance from the source is propagated in the form of waves through space and the energy is distributed equally in all directions Even though this theory could satisfactorily explain several optical phenomena, the presence of ether could not be ...
... disturbance in hypothetical medium called ether. The disturbance from the source is propagated in the form of waves through space and the energy is distributed equally in all directions Even though this theory could satisfactorily explain several optical phenomena, the presence of ether could not be ...
Variable xy-UV beam expander for high-power laser
... onto a photo resist coated copper clad plate, from which the substrates will eventually be diced. The illumination optical system consists of many sub-systems to be able to present the required top-hat distribution onto the SLM. In this paper we focus on only one of these sub-systems, a variable x,y ...
... onto a photo resist coated copper clad plate, from which the substrates will eventually be diced. The illumination optical system consists of many sub-systems to be able to present the required top-hat distribution onto the SLM. In this paper we focus on only one of these sub-systems, a variable x,y ...
1.5% root-mean-square flat-intensity laser beam
... both intensity and phase. However, since the calculation of lens surfaces is based on specific input and output beam shapes, the whole system can only work well for the single input–output combination. In addition, the technique can do nothing to reduce the effect of spatial noise and imperfections ...
... both intensity and phase. However, since the calculation of lens surfaces is based on specific input and output beam shapes, the whole system can only work well for the single input–output combination. In addition, the technique can do nothing to reduce the effect of spatial noise and imperfections ...
Introduction: When waves encounter obstacles (or openings), they
... rays of light come to focus nearer the lens than the red rays of light because for a given material the refractive index for violet rays of light is more than for red rays of light. In the case of a zone plate, there are a number of foci between the point O and P (Figure 8). Each focus corresponds t ...
... rays of light come to focus nearer the lens than the red rays of light because for a given material the refractive index for violet rays of light is more than for red rays of light. In the case of a zone plate, there are a number of foci between the point O and P (Figure 8). Each focus corresponds t ...
Fluorescence Microscopy
... light is scattered less, two-photon excitation of thick tissues is best coupled with an indicator that fluoresces and emits photons in the red region. In conventional imaging, spatial resolution is dependent on the wavelength of the excitation light and the microscope optics. In practice, with one-ph ...
... light is scattered less, two-photon excitation of thick tissues is best coupled with an indicator that fluoresces and emits photons in the red region. In conventional imaging, spatial resolution is dependent on the wavelength of the excitation light and the microscope optics. In practice, with one-ph ...
Wave Optics Theory and 3-D Deconvolution for the Light Field
... at recovering resolution in the manner described above. However, these algorithms make assumptions typical at macroscopic photographic scales: namely opaque scenes and diffusely reflecting objects. They also model light using ray optics. These assumptions do not hold when imaging microscopic samples ...
... at recovering resolution in the manner described above. However, these algorithms make assumptions typical at macroscopic photographic scales: namely opaque scenes and diffusely reflecting objects. They also model light using ray optics. These assumptions do not hold when imaging microscopic samples ...
ACOUSTO-OPTICS
... medium with a time-varying stratified refractive index. The theory of acousto-optics deals with the perturbation of the refractive index caused by sound, and with the propagation of light through this perturbed time-varying inhomogeneousmedium. The propagation of light in static (as opposed to time- ...
... medium with a time-varying stratified refractive index. The theory of acousto-optics deals with the perturbation of the refractive index caused by sound, and with the propagation of light through this perturbed time-varying inhomogeneousmedium. The propagation of light in static (as opposed to time- ...
The Optical Beam Diameter Within the Beam
... beam combiners, through the interferometer and reflected back into the beam combiners (a normal procedure for calibrating the system OPD), the returning wavefront will not only be much larger than the beam sent out, it will also have approximately a wave of curvature on it. 2. Thermal emissivity of ...
... beam combiners, through the interferometer and reflected back into the beam combiners (a normal procedure for calibrating the system OPD), the returning wavefront will not only be much larger than the beam sent out, it will also have approximately a wave of curvature on it. 2. Thermal emissivity of ...
Real-time phase measurement of optical vortices based on
... sampling array plate can be directly extracted from the inverse Fourier transform of the farfield diffraction intensity pattern. However, scanning the whole surface is time-consuming, and only the phase of sampled point can be measured. The measured phase image quality can be increased with smaller ...
... sampling array plate can be directly extracted from the inverse Fourier transform of the farfield diffraction intensity pattern. However, scanning the whole surface is time-consuming, and only the phase of sampled point can be measured. The measured phase image quality can be increased with smaller ...
Spectral linewidth of a Ne-like Ar capillary discharge soft-x-ray laser... on amplification beyond gain saturation
... be expected to effectively homogenize the Doppler component [21]. The latter is the result of velocity-changing collisions that transfer populations among the different velocity groups of the radiating ions such that a single velocity is no longer associated with each radiator (collisional redistrib ...
... be expected to effectively homogenize the Doppler component [21]. The latter is the result of velocity-changing collisions that transfer populations among the different velocity groups of the radiating ions such that a single velocity is no longer associated with each radiator (collisional redistrib ...
Gauthier Abstracts - Department of Electronics
... manipulation using human peripheral blood as a model system. A counterpropagating dual-beam optical-trapping configuration is shown theoretically and experimentally to be preferred due to a greater ability to manipulate cells in three dimensions. Theoretical analysis performed by simulating the prop ...
... manipulation using human peripheral blood as a model system. A counterpropagating dual-beam optical-trapping configuration is shown theoretically and experimentally to be preferred due to a greater ability to manipulate cells in three dimensions. Theoretical analysis performed by simulating the prop ...
Holography
Holography is the science and practice of making holograms. Typically, a hologram is a photographic recording of a light field, rather than of an image formed by a lens, and it is used to display a fully three-dimensional image of the holographed subject, which is seen without the aid of special glasses or other intermediate optics. The hologram itself is not an image and it is usually unintelligible when viewed under diffuse ambient light. It is an encoding of the light field as an interference pattern of seemingly random variations in the opacity, density, or surface profile of the photographic medium. When suitably lit, the interference pattern diffracts the light into a reproduction of the original light field and the objects that were in it appear to still be there, exhibiting visual depth cues such as parallax and perspective that change realistically with any change in the relative position of the observer.In its pure form, holography requires the use of laser light for illuminating the subject and for viewing the finished hologram. In a side-by-side comparison under optimal conditions, a holographic image is visually indistinguishable from the actual subject, if the hologram and the subject are lit just as they were at the time of recording. A microscopic level of detail throughout the recorded volume of space can be reproduced. In common practice, however, major image quality compromises are made to eliminate the need for laser illumination when viewing the hologram, and sometimes, to the extent possible, also when making it. Holographic portraiture often resorts to a non-holographic intermediate imaging procedure, to avoid the hazardous high-powered pulsed lasers otherwise needed to optically ""freeze"" living subjects as perfectly as the extremely motion-intolerant holographic recording process requires. Holograms can now also be entirely computer-generated and show objects or scenes that never existed.Holography should not be confused with lenticular and other earlier autostereoscopic 3D display technologies, which can produce superficially similar results but are based on conventional lens imaging. Stage illusions such as Pepper's Ghost and other unusual, baffling, or seemingly magical images are also often incorrectly called holograms.