Laser holder structures reducing optical axis deviation between three laser beams

2020 ◽  
Vol 2020 (0) ◽  
pp. 2C01
Author(s):  
Manabu OCHI ◽  
Tatsuya YAMASAKI ◽  
Masashi YAMASHITA
Keyword(s):  
Optical Axis ◽  
Laser Beams ◽  
Axis Deviation

Energy transfer between laser beams due to recording of optical axis gratings in liquid crystals

2006 ◽  
Vol 23 (10) ◽  
pp. 2113 ◽  
Author(s):  
Sarik R. Nersisyan ◽  
Nelson V. Tabiryan ◽  
C. Martin Stickley
Keyword(s):  
Energy Transfer ◽  
Liquid Crystals ◽  
Optical Axis ◽  
Laser Beams

scholarly journals Asymmetric hypergeometric laser beams

2019 ◽  
Vol 43 (5) ◽  
pp. 735-740
Author(s):  
V.V. Kotlyar ◽  
A.A. Kovalev ◽  
E.G. Abramochkin
Keyword(s):  
Exact Solution ◽  
Angular Momentum ◽  
Hypergeometric Function ◽  
Orbital Angular Momentum ◽  
Topological Charge ◽  
Optical Axis ◽  
Type Equation ◽  
Laser Beams ◽  
Propagation Equation ◽  
Degenerate Hypergeometric Function

Here we study asymmetric Kummer beams (aK-beams) with their scalar complex amplitude being proportional to the Kummer function (a degenerate hypergeometric function). These beams are an exact solution of the paraxial propagation equation (Schrödinger-type equation) and obtained from the conventional symmetric hypergeometric beams by a complex shift of the transverse coordinates. On propagation, the aK-beams change their intensity weakly and rotate around the optical axis. These beams are an example of vortex laser beams with a fractional orbital angular momentum (OAM), which depends on four parameters: the vortex topological charge, the shift magnitude, the logarithmic axicon parameter and the degree of the radial factor. Changing these parameters, it is possible to control the beam OAM, either continuously increasing or decreasing it.

Evaluate the impact of optical axis stability on the exoplanet detection

2021 ◽  
Author(s):  
dongjie Tan ◽  
Jia-Cheng Liu ◽  
Zi Zhu ◽  
Niu Liu
Keyword(s):  
Optical Axis ◽  
Photographic Plate ◽  
Focal Length ◽  
Length Change ◽  
Distance Measurement ◽  
Angular Distance ◽  
Axis Deviation ◽  
The Stability ◽  
The Impact ◽  
Star Position

Abstract For detecting exoplanets with high precision, using the angular distance between the two stars to detect the periodic motion of the star will be a better choice. This approach can avoid importing the position error of the reference catalog in the process that using the traditional photographic plate to derive the star position. At the precision level of microarcseconds, the error caused by optical axis deviation is not negligible. In this paper, we evaluate the impact of the stability of the optical axis on the relative angular distance measurement from the aspects of theoretical analysis and numerical simulation. When the angular distance error limit of 1~microarcsecond is given, the upper limit of optical axis deviation is estimated to be 68~milliarcsecond. In addition, when limiting the deviation of the optical axis, we give the corresponding error allowance of angular distance measurement. Moreover, we also discuss the way to resolve the problem of CCD distortion and focal length change on the measurement of angular distance. The work in this paper is of guiding significance to the design of the telescope.

Increasing the power and quality of beam in coherent combination of laser beams by controlling optical axis angles

2021 ◽  
Vol 53 (9) ◽  
Author(s):  
Naser Siahvashi ◽  
Moslem Hamdami ◽  
Atoosa Sadat Arabanian ◽  
Reza Massudi
Keyword(s):  
Optical Axis ◽  
Laser Beams

scholarly journals Measurement of six degree bi-directional motion error of linear stage

2018 ◽  
Vol 153 ◽  
pp. 06007
Author(s):  
Ryoshu Furutani
Keyword(s):  
Measurement System ◽  
Laser Interferometer ◽  
Optical Axis ◽  
Vertical Plane ◽  
Axial Direction ◽  
Distance Measurement ◽  
Laser Beams ◽  
Linear Stage ◽  
Motion Error ◽  
Error Angle

We proposed the measurement system of the six degree of motion errors which is based on distance measurement by the laser interferometer. The system has six parallel laser beams and six ball lenses as the retroreflectors on the linear stage, which reflect the corresponding laser beams. In the proposed system, the error of axial direction is measured with the ordinary distance measurement method by laser interferometer. The vertical errors to the axial direction and the roll errors around the optical axis are measured by tilted beams using the wedge prism. The pitch and yaw errors in the vertical plane to the optical axis are measured by the difference between distance of two ball lenses. The former system can measure the displacement and the error angle in one-direction. The propose system are expanded and bi-directional displacement and error angle can be measured. In this paper, it is shown how to expand the measurement system. As a result, the maximum displacement errors in x, y and z directions are 242nm, 179nm and 90nm. The maximum rotational errors around x, y, z axes are 1.75 arcsec, 2.35 arcsec and 1.67 arcsec.

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