NGAO NGS WFS design review - Caltech Optical Observatories
... • 5x5 mode of operation – to simply the size of moving parts while facilitating the two pupil sampling modes, we use the same collimator and post-lenslet relay for both the 63 and 5 sub-ap mode of operation. – We choose 48 pixels/sub-aperture (instead of 50 pixels/sub-ap) to enable 4x4 binned pixel/ ...
... • 5x5 mode of operation – to simply the size of moving parts while facilitating the two pupil sampling modes, we use the same collimator and post-lenslet relay for both the 63 and 5 sub-ap mode of operation. – We choose 48 pixels/sub-aperture (instead of 50 pixels/sub-ap) to enable 4x4 binned pixel/ ...
An Injection-Locked 674 nm Laser for Strontium-88
... frequency was observed to drift higher in later scans. After some time, the slave laser failed to lock in this range until the current was adjusted. The resolution of the High Finesse WS-7 wavemeter used for these frequency measurements is about 40 MHz, so the errors (based on the standard deviation ...
... frequency was observed to drift higher in later scans. After some time, the slave laser failed to lock in this range until the current was adjusted. The resolution of the High Finesse WS-7 wavemeter used for these frequency measurements is about 40 MHz, so the errors (based on the standard deviation ...
Microscopic Light Field Particle Image Velocimetry
... Plot of residual values for velocities and continuity vs. iterations. All three components of velocity converge around 2500 iterations. . . . . . . . . . . . . . . . Comparison of theoretical and computational velocity profiles in the narrow channel section, S3 . The channel dimensions for the CFD s ...
... Plot of residual values for velocities and continuity vs. iterations. All three components of velocity converge around 2500 iterations. . . . . . . . . . . . . . . . Comparison of theoretical and computational velocity profiles in the narrow channel section, S3 . The channel dimensions for the CFD s ...
Ultrafast Acoustic Phonon Ballistics in Semiconductor Heterostructures
... phonons before their decay and before the onset of distortions from phonon focusing. Many previous experiments in both metals [9] and bulk semiconductors [4] were restricted in the maximum emitted phonon frequency by the rapid diffusion of electrons after laser excitation. In contrast, here the elec ...
... phonons before their decay and before the onset of distortions from phonon focusing. Many previous experiments in both metals [9] and bulk semiconductors [4] were restricted in the maximum emitted phonon frequency by the rapid diffusion of electrons after laser excitation. In contrast, here the elec ...
TDLS98AbBook
... semiconductor epitaxial growth. On the other hand, silicon and IV-VI semiconductors such as PbSe have a thermal expansion coefficient mismatch of 750% and a lattice parameter mismatch of 13%. Although these large mismatches would normally cause severe problems in obtaining good epitaxy, recent exper ...
... semiconductor epitaxial growth. On the other hand, silicon and IV-VI semiconductors such as PbSe have a thermal expansion coefficient mismatch of 750% and a lattice parameter mismatch of 13%. Although these large mismatches would normally cause severe problems in obtaining good epitaxy, recent exper ...
Holographic 3-D Displays - Electro-holography within
... Germany 1. Introduction Holography is a diffraction-based coherent imaging technique in which a complex threedimensional object can be reproduced from a flat, two-dimensional screen with a complex transparency representing amplitude and phase values. It is commonly agreed that real-time holography i ...
... Germany 1. Introduction Holography is a diffraction-based coherent imaging technique in which a complex threedimensional object can be reproduced from a flat, two-dimensional screen with a complex transparency representing amplitude and phase values. It is commonly agreed that real-time holography i ...
Construction of a Calcium Matter-Wave Interferometer
... The interferometer described in this thesis is similar to the experiments described in [10, 39–42]. It is based on beams of visible light that split and recombine the wave functions of calcium atoms traveling in a thermal beam. The interferometer will be used as an atomic clock and in the future wil ...
... The interferometer described in this thesis is similar to the experiments described in [10, 39–42]. It is based on beams of visible light that split and recombine the wave functions of calcium atoms traveling in a thermal beam. The interferometer will be used as an atomic clock and in the future wil ...
Low-Temperature Bonding for Silicon-Based Micro
... and data processing. In addition, the fabrication of Si-based devices is compatible with parallel processing which can potentially lower the cost. One practical example of such system is the early diagnosis and monitoring of human diseases using autofluoresnce or fluorescence lifetime imaging [1]. A ...
... and data processing. In addition, the fabrication of Si-based devices is compatible with parallel processing which can potentially lower the cost. One practical example of such system is the early diagnosis and monitoring of human diseases using autofluoresnce or fluorescence lifetime imaging [1]. A ...
Representation of Wavefront Aberrations
... The problem is that the eye is a closed system so it is difficult for a clinician to inspect the light rays and wavefronts once they enter the eye to see if they are perfect. For this reason, objective methods have been devised for measuring the optical aberrations of eyes using light that is reflec ...
... The problem is that the eye is a closed system so it is difficult for a clinician to inspect the light rays and wavefronts once they enter the eye to see if they are perfect. For this reason, objective methods have been devised for measuring the optical aberrations of eyes using light that is reflec ...
In pursuit of objective dry eye screening clinical
... imaging have been high-frequency ultrasound (HFUBM), time-domain OCT, and confocal microscopy through focusing (CMTF) [65]. None of these were fully clinically applicable and/or had a commercially available model for this specific use. For example, HF-UBM employs fluid coupling, which explains why w ...
... imaging have been high-frequency ultrasound (HFUBM), time-domain OCT, and confocal microscopy through focusing (CMTF) [65]. None of these were fully clinically applicable and/or had a commercially available model for this specific use. For example, HF-UBM employs fluid coupling, which explains why w ...
Properties and sensing characteristics of surface
... nonuniformity of the film thickness in the light spot. Indeed, roughness can lead to a certain increase in the imaginary part of the plasmon wave number ⌫ i , whereas the nonuniformity can increase the loss term wave number ⌫ r . Both mechanisms increase the numerator of Eq. (5) and, consequently, t ...
... nonuniformity of the film thickness in the light spot. Indeed, roughness can lead to a certain increase in the imaginary part of the plasmon wave number ⌫ i , whereas the nonuniformity can increase the loss term wave number ⌫ r . Both mechanisms increase the numerator of Eq. (5) and, consequently, t ...
Non-Collinear Second Harmonic Generation in
... any manner. The laser itself, producing light not available in nature, is the most obvious example. Because of the extremely small photon-photon interaction cross-section the direct influence of one light beam on another is not practical with today’s light sources. Therefore the nonlinearity is achi ...
... any manner. The laser itself, producing light not available in nature, is the most obvious example. Because of the extremely small photon-photon interaction cross-section the direct influence of one light beam on another is not practical with today’s light sources. Therefore the nonlinearity is achi ...
Customer-Made 3×3 Polymer Optical Fiber Splitter Based on Green
... that split the optical power which carried by single fiber input to multiple fiber output. For multiple input in which the combined inputs make it as a single output, is called as coupling. Optical splitter using tapered fusion techniques (Fused Taper Optical Splitter) is an optical splitter based o ...
... that split the optical power which carried by single fiber input to multiple fiber output. For multiple input in which the combined inputs make it as a single output, is called as coupling. Optical splitter using tapered fusion techniques (Fused Taper Optical Splitter) is an optical splitter based o ...
Elastic stretchable optical fibers
... from a polystyrene-polyisoprene triblock copolymer, and a low refractive index cladding, formed by a fluorinated thermoplastic elastomer. The fibers are manufactured by co-extrusion of their constituent materials. They can be stretched to 300% strain repeatedly. Axial deformation of the fibers resul ...
... from a polystyrene-polyisoprene triblock copolymer, and a low refractive index cladding, formed by a fluorinated thermoplastic elastomer. The fibers are manufactured by co-extrusion of their constituent materials. They can be stretched to 300% strain repeatedly. Axial deformation of the fibers resul ...
by ZHAOBING TIAN
... photolithographic procedures. Two new sensor components, namely abrupt tapers and connectoroffset attenuators, are proposed as couplers in the optical fiber to couple light from core to cladding (or reverse) to replace LPGs. Using OPTIBPM software, the coupling coefficients between core and cladding ...
... photolithographic procedures. Two new sensor components, namely abrupt tapers and connectoroffset attenuators, are proposed as couplers in the optical fiber to couple light from core to cladding (or reverse) to replace LPGs. Using OPTIBPM software, the coupling coefficients between core and cladding ...
About the reduction of reflections for camera lenses How T
... Introduction ................................................................................................................................. 1 Antireflection coatings and image quality ..................................................................................... 1 The point spread function ...
... Introduction ................................................................................................................................. 1 Antireflection coatings and image quality ..................................................................................... 1 The point spread function ...
Optimally designed narrowband guided
... pathology [21, 22] by acquisition of data only from a few specific regions in the spectrum that correspond to known spectral features that differentiate cell and disease types [23, 24]. Compared to Fourier Transform Infrared (FTIR) spectroscopic imaging, discrete-frequency IR (DFIR) spectroscopy can ...
... pathology [21, 22] by acquisition of data only from a few specific regions in the spectrum that correspond to known spectral features that differentiate cell and disease types [23, 24]. Compared to Fourier Transform Infrared (FTIR) spectroscopic imaging, discrete-frequency IR (DFIR) spectroscopy can ...
Semiconductor Lasers Using Diffused Quantum
... incident laser needed to heat the sample to the temperature where disordering occurs will be reduced significantly by the increase of background temperature. Another advantage of using ceramic is that its low thermal conductivity also helps in reducing the required power density of laser beam. There ...
... incident laser needed to heat the sample to the temperature where disordering occurs will be reduced significantly by the increase of background temperature. Another advantage of using ceramic is that its low thermal conductivity also helps in reducing the required power density of laser beam. There ...
LASER LIGHT SCATTERING FOR INVESTIGATION OF PARTICLE
... consistency, and ease of use have made it the most popular method for process control[6]. In Ethiopia, coffee grading is conducted through the combination of two methods [3]. They are green coffee (raw bean) analysis and cup tests (liquoring). Green coffee analysis involves visual inspection of phys ...
... consistency, and ease of use have made it the most popular method for process control[6]. In Ethiopia, coffee grading is conducted through the combination of two methods [3]. They are green coffee (raw bean) analysis and cup tests (liquoring). Green coffee analysis involves visual inspection of phys ...
Lecture Note No. 3 Reflection and Refraction (Sections 4.3 to 4.8)
... No. of reflectors (atoms) ...
... No. of reflectors (atoms) ...
Guide for the Measurement of Smooth Surface Topography using
... Figure 3. Constructive interference from one light source .......................................................5 Figure 4. A typical CSI design..................................................................................................6 Figure 5. Schematic of how to build up an interferogram ...
... Figure 3. Constructive interference from one light source .......................................................5 Figure 4. A typical CSI design..................................................................................................6 Figure 5. Schematic of how to build up an interferogram ...
Soliton Interaction in Fiber Bragg Gratings: Optical AND Gate Formation
... A Bragg soliton is a solitary wave that propagates within an FBG as the result of balancing dispersion and SPM from the Bragg reflections. These solitons propagate without any significant change in shape and can be transmitted into other fibers. As compared to typical fiber solitons, Bragg solitons ...
... A Bragg soliton is a solitary wave that propagates within an FBG as the result of balancing dispersion and SPM from the Bragg reflections. These solitons propagate without any significant change in shape and can be transmitted into other fibers. As compared to typical fiber solitons, Bragg solitons ...
Atmospheric Optics
... Mirages 861 Review 863 Homework Exercises 863 Broaden Knowledge & Comprehension 863 Apply 864 Evaluate & Analyze 866 Synthesize 868 ...
... Mirages 861 Review 863 Homework Exercises 863 Broaden Knowledge & Comprehension 863 Apply 864 Evaluate & Analyze 866 Synthesize 868 ...
Prac%ce`Quiz3`Part1`
... E) degrees B) The intensity stays the same. C) The intensity doubles. 5) A ray in glass is incident onto a water-glass interface, at an angle of incidence equal to half the ...
... E) degrees B) The intensity stays the same. C) The intensity doubles. 5) A ray in glass is incident onto a water-glass interface, at an angle of incidence equal to half the ...
Optical coherence tomography
Optical coherence tomography (OCT) is an established medical imaging technique that uses light to capture micrometer-resolution, three-dimensional images from within optical scattering media (e.g., biological tissue). Optical coherence tomography is based on low-coherence interferometry, typically employing near-infrared light. The use of relatively long wavelength light allows it to penetrate into the scattering medium. Confocal microscopy, another optical technique, typically penetrates less deeply into the sample but with higher resolution.Depending on the properties of the light source (superluminescent diodes, ultrashort pulsed lasers, and supercontinuum lasers have been employed), optical coherence tomography has achieved sub- micrometer resolution (with very wide-spectrum sources emitting over a ~100 nm wavelength range).Optical coherence tomography is one of a class of optical tomographic techniques. A relatively recent implementation of optical coherence tomography, frequency-domain optical coherence tomography, provides advantages in signal-to-noise ratio, permitting faster signal acquisition. Commercially available optical coherence tomography systems are employed in diverse applications, including art conservation and diagnostic medicine, notably in ophthalmology and optometry where it can be used to obtain detailed images from within the retina. Recently it has also begun to be used in interventional cardiology to help diagnose coronary artery disease. It has also shown promise in dermatology to improve the diagnostic process.