A Green Laser Pointer Hazard
... packaging. One of these lasers had a much weaker green light intensity compared to the others, as judged by normal eyesight. We measured the output power of that laser and found that it emitted more than ten times more invisible infrared light than visible green light. This is a serious hazard, sinc ...
... packaging. One of these lasers had a much weaker green light intensity compared to the others, as judged by normal eyesight. We measured the output power of that laser and found that it emitted more than ten times more invisible infrared light than visible green light. This is a serious hazard, sinc ...
Optical forces through guided light deflections
... or light scattering [20–23]. In this work we bring focus to the object shaping aspects of optimizing the mechanical effects of optical fields. We demonstrated in a recent work the optical manipulation of 2PP-fabricated free-floating waveguides [12]. Here we again consider three-dimensional waveguide ...
... or light scattering [20–23]. In this work we bring focus to the object shaping aspects of optimizing the mechanical effects of optical fields. We demonstrated in a recent work the optical manipulation of 2PP-fabricated free-floating waveguides [12]. Here we again consider three-dimensional waveguide ...
(full text)
... at perpendicular incidence, which decreases to nearly zero absorptance at φ 57°. The NbN absorptance remains smaller than at perpendicular incidence throughout all polar angles, but reaches a local maximum at φ 70°, where the value is approximately a third of the absorptance at perpendicular inc ...
... at perpendicular incidence, which decreases to nearly zero absorptance at φ 57°. The NbN absorptance remains smaller than at perpendicular incidence throughout all polar angles, but reaches a local maximum at φ 70°, where the value is approximately a third of the absorptance at perpendicular inc ...
Precession optomechanics - EECS @ UMich
... applied on this structure are distributed torque (Eq. (2) for the bent regions, zero load at the straight regions and zero motion at the ends where they are mechanically mounted. Upon deformation, the torque from Eq. (2) is modified as a function of the local deformed radius. We iteratively take thi ...
... applied on this structure are distributed torque (Eq. (2) for the bent regions, zero load at the straight regions and zero motion at the ends where they are mechanically mounted. Upon deformation, the torque from Eq. (2) is modified as a function of the local deformed radius. We iteratively take thi ...
Optical decay from a Fabry-Perot cavity faster than the decay time
... length or the frequency of the input light field is rapidly changed. The results which we present here complete and generalize those earlier studies since we show how the full control of frequency, phase, intensity and time duration of an input light field leads to a much larger variety of interfere ...
... length or the frequency of the input light field is rapidly changed. The results which we present here complete and generalize those earlier studies since we show how the full control of frequency, phase, intensity and time duration of an input light field leads to a much larger variety of interfere ...
Bessel Beam Theory - u.arizona.edu
... the Rayleigh range of a 25m waist beam is only 3.1mm. These nearly non-diffracting beams clearly have a central peak that propagates much further that the Rayleigh distance for Gaussian beams. Finite energy Bessel beams can give great insight into the wave nature of light and electromagnetic fields ...
... the Rayleigh range of a 25m waist beam is only 3.1mm. These nearly non-diffracting beams clearly have a central peak that propagates much further that the Rayleigh distance for Gaussian beams. Finite energy Bessel beams can give great insight into the wave nature of light and electromagnetic fields ...
Acousto-Optic Effect and Its use in Signal Processing Abstract 1
... the same polarization as the incident light. In a later monograph, he shows that this is true to a very good approximation, even in the case of strong interaction where the perturbation theory fails. During the 1960s, the character of acousto-optics changed completely. The invention of the laser cre ...
... the same polarization as the incident light. In a later monograph, he shows that this is true to a very good approximation, even in the case of strong interaction where the perturbation theory fails. During the 1960s, the character of acousto-optics changed completely. The invention of the laser cre ...
Nondiffracting Light Beams for Long Ranges
... This requirement occurs in many cases. Electromagnetic waves including light beams, however, spread by the diffraction effect. The beam divergence angle Δθ can be given by Δθ＝λ/D (λ: wavelength, D : diameter of aperture). For getting a small divergence beam, the diameter of beam transmission must be ...
... This requirement occurs in many cases. Electromagnetic waves including light beams, however, spread by the diffraction effect. The beam divergence angle Δθ can be given by Δθ＝λ/D (λ: wavelength, D : diameter of aperture). For getting a small divergence beam, the diameter of beam transmission must be ...
Chapter 6 Experiment 4: Wave Interference
... In the Fraunhofer formalism light is represented by plane waves, and the distance between light-source and scattering object or scattering object and observer is assumed to be very large compared to the dimensions of the obstacle in the light path. If you drop these conditions, the light phenomena o ...
... In the Fraunhofer formalism light is represented by plane waves, and the distance between light-source and scattering object or scattering object and observer is assumed to be very large compared to the dimensions of the obstacle in the light path. If you drop these conditions, the light phenomena o ...
Optical Studies and Micro-Structure Modeling of the Circular-Polarizing Scarab Beetles Cetonia aurata
... Liocola marmorata are of the family Scarabaediae and subfamily Cetoniianae (Guldbaggar). They were all collected at locations in Sweden and are the only species of Cetoniinae scarabs in Sweden. This work reports on their optical properties represented by Mueller-matrix elements, degree of polarizati ...
... Liocola marmorata are of the family Scarabaediae and subfamily Cetoniianae (Guldbaggar). They were all collected at locations in Sweden and are the only species of Cetoniinae scarabs in Sweden. This work reports on their optical properties represented by Mueller-matrix elements, degree of polarizati ...
PDF
... from 100nm to 590nm in steps of 10nm . The bus waveguide, in the coupling region, is 220nm high and 400nm wide. The waveguide in the ring is 220nm high and 480nm wide. In order to make bending loss negligible compared to scattering loss the radii of the microrings were set to 10 μ m . The test struc ...
... from 100nm to 590nm in steps of 10nm . The bus waveguide, in the coupling region, is 220nm high and 400nm wide. The waveguide in the ring is 220nm high and 480nm wide. In order to make bending loss negligible compared to scattering loss the radii of the microrings were set to 10 μ m . The test struc ...
Plasmonic Airy beams with dynamically controlled trajectories Peng Zhang, Sheng Wang,
... extensively for many decades due to their abilities to highly enhance optical fields and manipulate light at an extremely small scale beyond the diffraction limit [1]. To manipulate SPPs over a metal surface, which is essential for building ultracompact integrated photonic circuits, different plasmo ...
... extensively for many decades due to their abilities to highly enhance optical fields and manipulate light at an extremely small scale beyond the diffraction limit [1]. To manipulate SPPs over a metal surface, which is essential for building ultracompact integrated photonic circuits, different plasmo ...
Imaging and Measurement of Thermal Lensing in Glass
... which can be created by changing the cavity length, enters the crystal, its higher intensity causes the Kerr lensing effect. The less intense CW mode doesn’t induce this Kerr lensing so is left to diverge more. Since the pulsed mode is focused it will pass through more of the narrow pumped crystal t ...
... which can be created by changing the cavity length, enters the crystal, its higher intensity causes the Kerr lensing effect. The less intense CW mode doesn’t induce this Kerr lensing so is left to diverge more. Since the pulsed mode is focused it will pass through more of the narrow pumped crystal t ...
Fiber Bragg Gratings
... A second method uses Bloch wave analysis on the grating structure allowing for exact solutions, since Block waves are the natural modes of periodic media. The Bloch treatment is more invovled than coupled mode theory, but it is more appropriate for more complex structures such as superlattices or wh ...
... A second method uses Bloch wave analysis on the grating structure allowing for exact solutions, since Block waves are the natural modes of periodic media. The Bloch treatment is more invovled than coupled mode theory, but it is more appropriate for more complex structures such as superlattices or wh ...
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.