Experimental Study on Optical Axis Alignment of the Optical Antenna under the Spot Broken

2017 ◽  
Vol 46 (4) ◽  
pp. 406002
Author(s):  
柯熙政 KE Xi-zheng ◽  
李世艳 LI Shi-yan
Keyword(s):  
Experimental Study ◽  
Optical Axis ◽  
Optical Antenna ◽  
Axis Alignment

The Design of Gaussian Matching Model in the Optical Axis Alignment

2012 ◽  
Vol 271-272 ◽  
pp. 1164-1167
Author(s):  
Yi Feng Zhu ◽  
Lin Tao Yu ◽  
Lei Shi ◽  
Rui Rui Shang
Keyword(s):  
Information Transmission ◽  
Atmospheric Turbulence ◽  
Optical Axis ◽  
Alignment Accuracy ◽  
Matching Algorithm ◽  
Gaussian Fitting ◽  
Axis Alignment ◽  
Laser Communications ◽  
Spot Image ◽  
Outdoor Experiments

In the space laser communications, Information transmission by atmospheric turbulence and background light and other atmospheric interference of the random channel. Resulting in the optical axis alignment accuracy decreased. In order to improve the alignment accuracy of the optical axis, Proposing the Gaussian fitting matching algorithm. Outdoor experiments confirmed the Gaussian fitting matching algorithm to ensure a stable spot image.

scholarly journals Terahertz Optical Properties of KTiOPO4 Crystal in the Temperature Range of (−192)–150 °C

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 125
Author(s):  
Alina Rybak ◽  
Valery Antsygin ◽  
Alexander Mamrashev ◽  
Nazar Nikolaev
Keyword(s):  
Experimental Study ◽  
Optical Properties ◽  
Frequency Dependence ◽  
Optical Axis ◽  
Potassium Titanyl Phosphate ◽  
Refractive Indices ◽  
Frequency Range ◽  
Temperature Range ◽  
Ktp Crystal ◽  
Optical Axes

This paper presents the results of an experimental study of the optical properties of highly resistive monocrystals of potassium titanyl phosphate (KTiOPO4, KTP) in the frequency range of 0.2–1 THz and the temperature range of (−192)–150 °C. The dispersion of the refractive indices is approximated in the form of Sellmeier equations. The results show that the temperature dependence of the Sellmeier coefficients for all three principal optical axes is close to linear and, most likely, does not experience an extremum in the vicinity of the activation temperatures of the cationic conductivity of the KTP crystal at (−73)–(−23) °C. Weak frequency dependence of an optical axis direction angle VZ in the range of 0.2–1 THz is confirmed. However, the change in VZ with temperature is three times higher than reported before.

scholarly journals Properties of Cassegrain optical antenna with inclined optical axis

2009 ◽  
Vol 58 (2) ◽  
pp. 946
Author(s):  
Ran Ying-Hua ◽  
Yang Hua-Jun ◽  
Xu Quan ◽  
Xie Kang ◽  
Huang Jin
Keyword(s):  
Optical Axis ◽  
Optical Antenna

Analysis of 3-d molecular distribution with the digital imaging microscope

1988 ◽  
Vol 46 ◽  
pp. 40-41
Author(s):  
W.A. Carrington ◽  
F.S. Fay ◽  
K.E. Fogarty ◽  
L. Lifshitz
Keyword(s):  
Image Restoration ◽  
Digital Imaging ◽  
Fluorescent Dyes ◽  
Optical Axis ◽  
Computer Hardware ◽  
Computer Algorithms ◽  
Low Contrast ◽  
Specific Proteins ◽  
Effective Use ◽  
Single Living Cells

Advances in digital imaging microscopy and in the synthesis of fluorescent dyes allow the determination of 3D distribution of specific proteins, ions, GNA or DNA in single living cells. Effective use of this technology requires a combination of optical and computer hardware and software for image restoration, feature extraction and computer graphics.The digital imaging microscope consists of a conventional epifluorescence microscope with computer controlled focus, excitation and emission wavelength and duration of excitation. Images are recorded with a cooled (-80°C) CCD. 3D images are obtained as a series of optical sections at .25 - .5 μm intervals.A conventional microscope has substantial blurring along its optical axis. Out of focus contributions to a single optical section cause low contrast and flare; details are poorly resolved along the optical axis. We have developed new computer algorithms for reversing these distortions. These image restoration techniques and scanning confocal microscopes yield significantly better images; the results from the two are comparable.

Field Distribution of Strongly Excited Magnetic Lenses

1975 ◽  
Vol 33 ◽  
pp. 140-141
Author(s):  
M. Strojnik
Keyword(s):  
Flux Density ◽  
Field Distribution ◽  
Optical Axis ◽  
Operating Point ◽  
Pole Piece ◽  
Partial Saturation ◽  
Axial Flux ◽  
The Stability

Magnetic lenses operating in partial saturation offer two advantages in HVEM: they exhibit small cs and cc and their power depends little on the excitation IN. Curve H, Fig. 1, shows that the maximal axial flux density Bz max of one of the lenses investigated changes between points (3) and (4) by 5% as the excitation varies by 40%. Consequently, the designer can relax the requirements concerning the stability of the lens current supplies. Saturated lenses, however, can only be used if (i) unwanted fields along the optical axis can be controlled, (ii) 'wobbling' of the optical axis due to inhomogeneous saturation around the pole piece faces is prevented, (iii) ample ampere-turns can be squeezed into the space available, and (iv) the lens operating point covers a sufficient range of accelerating voltages.

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

Sign in / Sign up

Export Citation Format

Share Document