Basic Wavefront Aberration Theory for Optical Metrology
... is always somewhat larger than would be predicted by Eq. (66). A better approximation for most types of aberration is given by Strehl ratio ...
... is always somewhat larger than would be predicted by Eq. (66). A better approximation for most types of aberration is given by Strehl ratio ...
Wu_umd_0117E_17432 - DRUM
... This thesis is motivated by Dr. Davis’s idea to investigate atmospheric turbulence effects from their effect on a full light field (plenoptic field). Starting in 2012, in a relatively short period of time (3 years), we have opened a new chapter in wavefront sensing and treatment of atmospheric turbu ...
... This thesis is motivated by Dr. Davis’s idea to investigate atmospheric turbulence effects from their effect on a full light field (plenoptic field). Starting in 2012, in a relatively short period of time (3 years), we have opened a new chapter in wavefront sensing and treatment of atmospheric turbu ...
Visibility study of graphene multilayer structures Guoquan Teo and
... with the addition of a resist layer with optimum thickness on almost all types of substrates. This ...
... with the addition of a resist layer with optimum thickness on almost all types of substrates. This ...
Length Scales Analysis of Wave Scattering from Rough Surfaces
... The scattered intensity depends on the altitude correlation function of the rough surface, so the area of the correlated section (the part of the surface that has correlated altitudes) also plays an important role. To calculate the intensity of the scattered wave, we use r = 0 and r as the lower and ...
... The scattered intensity depends on the altitude correlation function of the rough surface, so the area of the correlated section (the part of the surface that has correlated altitudes) also plays an important role. To calculate the intensity of the scattered wave, we use r = 0 and r as the lower and ...
OPTO - SPIE
... systems have relatively small optical gain. The result is that the laser cavity has to be relatively low-loss, which might make the LEF smaller, but comes at the expense of the modulation bandwidth since the photon lifetime is longer. The challenge is to access the large differential gain available ...
... systems have relatively small optical gain. The result is that the laser cavity has to be relatively low-loss, which might make the LEF smaller, but comes at the expense of the modulation bandwidth since the photon lifetime is longer. The challenge is to access the large differential gain available ...
High-Temperature Operation of Terahertz Quantum Cascade Laser
... rials or photoconductive switches), has a demonstrated potential in some of these areas [1], [2]. However, further development of THz systems will require compact semiconductor-based sources: there currently exist no room temperature, high-power, widely tunable THz sources that are suitable for prod ...
... rials or photoconductive switches), has a demonstrated potential in some of these areas [1], [2]. However, further development of THz systems will require compact semiconductor-based sources: there currently exist no room temperature, high-power, widely tunable THz sources that are suitable for prod ...
Effect of vitamin C on collagen biosynthesis and degree of
... Relation of change in birefringence with polarization Birefringence in skin is due to the asymmetrical collagen fibril structure and may change if the underlying structure is disrupted due to local heat generation by fire or acid burns (Thomsen et al., 1991; Maitland et al., 1994). The induced heat ...
... Relation of change in birefringence with polarization Birefringence in skin is due to the asymmetrical collagen fibril structure and may change if the underlying structure is disrupted due to local heat generation by fire or acid burns (Thomsen et al., 1991; Maitland et al., 1994). The induced heat ...
Adaptive Control of Ultrashort Laser Pulses for
... was emitted. Not much later the method of Q-switching was proposed by Hellwarth in 1961 [2] and pulsed laser output not much shorter than 100 ns was possible. The need for finer time resolution led to the discovery that many different laser modes can be coupled to form pulses with broader bandwidth. ...
... was emitted. Not much later the method of Q-switching was proposed by Hellwarth in 1961 [2] and pulsed laser output not much shorter than 100 ns was possible. The need for finer time resolution led to the discovery that many different laser modes can be coupled to form pulses with broader bandwidth. ...
thin film opal photonic crystals - Elpub Wuppertal
... The movement of electrons in semiconductors is well understood and can be controlled and harnessed in electronic devices; this is the basis of modern electronics. The next goal is the replacement of microelectronic components by optical micro-devices. The flow of light is much harder to control and ...
... The movement of electrons in semiconductors is well understood and can be controlled and harnessed in electronic devices; this is the basis of modern electronics. The next goal is the replacement of microelectronic components by optical micro-devices. The flow of light is much harder to control and ...
Basic Wavefront Aberration Theory for Optical Metrology
... different aberrations can be compared to those results. Tilt in a wavefront affects the image by causing a shift of its center location in the Gaussian image plane. A tilt causing a positive OPD change in the +x direction will cause the image to shift in the -x direction, as shown in Fig. 5. ...
... different aberrations can be compared to those results. Tilt in a wavefront affects the image by causing a shift of its center location in the Gaussian image plane. A tilt causing a positive OPD change in the +x direction will cause the image to shift in the -x direction, as shown in Fig. 5. ...
Topics in Adaptive Optics
... Advances in adaptive optics technology and applications move forward at a rapid pace. The basic idea of wavefront compensation in real‐time has been around since the mid 1970s. The first widely used application of adaptive optics was for compensating atmospheric turbulence effects ...
... Advances in adaptive optics technology and applications move forward at a rapid pace. The basic idea of wavefront compensation in real‐time has been around since the mid 1970s. The first widely used application of adaptive optics was for compensating atmospheric turbulence effects ...
Nonlinear Optical Phenomena and Materials
... range the wavelength is usually much larger than the harmonic generator, so that the interaction is localized in a volume much smaller than the dimensions of a wavelength. In the optical region the situation is usually reversed and the nonlinear medium extends over many wavelengths. This leads to th ...
... range the wavelength is usually much larger than the harmonic generator, so that the interaction is localized in a volume much smaller than the dimensions of a wavelength. In the optical region the situation is usually reversed and the nonlinear medium extends over many wavelengths. This leads to th ...
Modeling Moiré: Visual Beat Effects in Nature and Optical Metrology
... that looked like a cat’s eye. Figures 2 (b) and 2 (c) show the screenshots of the M ATHEMATICA output for these cases. Although the two types of gratings themselves appeared to be rather similar, the moiré patterns created had a very discernible dissimilarity between them. Another type of grating s ...
... that looked like a cat’s eye. Figures 2 (b) and 2 (c) show the screenshots of the M ATHEMATICA output for these cases. Although the two types of gratings themselves appeared to be rather similar, the moiré patterns created had a very discernible dissimilarity between them. Another type of grating s ...
Report in in doc - Foundation for Research and Technology
... been possible because natural materials have essentially zero magnetic response at frequencies beyond the microwave regime. Thus, at least one half of optics & photonics has been missing, obviously limiting the opportunities regarding fundamental optical sciences as well as photonic components and d ...
... been possible because natural materials have essentially zero magnetic response at frequencies beyond the microwave regime. Thus, at least one half of optics & photonics has been missing, obviously limiting the opportunities regarding fundamental optical sciences as well as photonic components and d ...
Wavefront Aberration - University of Arizona
... different aberrations can be compared to those results. Tilt in a wavefront affects the image by causing a shift of its center location in the Gaussian image plane. A tilt causing a positive OPD change in the +x direction will cause the image to shift in the -x direction, as shown in Fig. 5. ...
... different aberrations can be compared to those results. Tilt in a wavefront affects the image by causing a shift of its center location in the Gaussian image plane. A tilt causing a positive OPD change in the +x direction will cause the image to shift in the -x direction, as shown in Fig. 5. ...
CRANFIELD UNIVERSITY Edouard Berrocal MULTIPLE
... through a typical hollow cone water spray. Versatile usage of this model is exemplified with its applications to image transfer through turbid media, correction of experimental Beer-Lambert measurements, the study of light scattering by single particles in the farfield region, and to simulate the pr ...
... through a typical hollow cone water spray. Versatile usage of this model is exemplified with its applications to image transfer through turbid media, correction of experimental Beer-Lambert measurements, the study of light scattering by single particles in the farfield region, and to simulate the pr ...
development and verification of the non
... I am indebted to my advisors Olivier Guyon and Michael Hart for their guidance during the completion of this dissertation. It has been an honor and a privilege to work with someone of Olivier’s caliber. Every conversation with him has been full of boundless insights into optical phenomenon, wavefron ...
... I am indebted to my advisors Olivier Guyon and Michael Hart for their guidance during the completion of this dissertation. It has been an honor and a privilege to work with someone of Olivier’s caliber. Every conversation with him has been full of boundless insights into optical phenomenon, wavefron ...
The effect of skin phototype on laser propagation through skin
... Figure 2.1: Relation between total exposure and exposure time for different modes of laser-tissue interaction (with permission from (Peng Q, 2008)). ..................................................................................... 6 Figure 2.2: Relation between fluence rate and exposure time for ...
... Figure 2.1: Relation between total exposure and exposure time for different modes of laser-tissue interaction (with permission from (Peng Q, 2008)). ..................................................................................... 6 Figure 2.2: Relation between fluence rate and exposure time for ...
High Harmonic Generation for Coherent Diffractive Imaging
... where only a few harmonic orders of short wavelength or a dominant photon energy are required and any optics in the harmonic beam path, such as reflection gratings, is undesirable. The novel and flexible approach of spectral extraction based on the application of the maximum entropy method to the in ...
... where only a few harmonic orders of short wavelength or a dominant photon energy are required and any optics in the harmonic beam path, such as reflection gratings, is undesirable. The novel and flexible approach of spectral extraction based on the application of the maximum entropy method to the in ...
Optical tweezers
Optical tweezers (originally called ""single-beam gradient force trap"") are scientific instruments that use a highly focused laser beam to provide an attractive or repulsive force (typically on the order of piconewtons), depending on the refractive index mismatch to physically hold and move microscopic dielectric objects similar to tweezers. Optical tweezers have been particularly successful in studying a variety of biological systems in recent years.