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

A NEW METHOD OF LENS CENTERING IN THE OPTICAL SYSTEM BY USING SPECIAL MOUNT

2021 ◽  
pp. 137-144
Author(s):  
Bao Bui Dinh
Keyword(s):  
Optical System ◽  
Optical Axis ◽  
Assembly Process ◽  
Optical Surface ◽  
Lens System ◽  
High Quality ◽  
Manufacturing Equipment ◽  
Influence Coefficients ◽  
Process Solutions

Decentration in lens systems (for example objectives) significantly degrades the quality of image, such as the coma. In order to reduce lens decentration, the lenses are centered while manufacturing, while gluing, while attachment in the mounts. Significant decrease in the lenses decentering in the mounts is achieved by using a special manufacturing equipment, which allow combining the optical axis of the lens with the base axis of the mount in assembly process. Solutions for coma's alignment by shifting, tilting and rotation their components are also provided in the construction of high-quality objectives (microscopes [1-7], photolithographic, aerophotographic). For optimization of methods for such adjustment the influence coefficients of decentering of each optical surface of the lens system on the value and sign of coma must be calculated and taken into account. In this paper, we propose a special mounting which combined with the Opticentric of Trioptics device to center the lenses. The results show that the decentering is significantly reduced (0.9µm) compared to (44.2µm) with using a reference mount.

Measurement and analysis of wavefront structures of diode lasers

2017 ◽  
Vol 84 (1) ◽  
Author(s):  
Inga-Maria Eichentopf ◽  
Martin Reufer
Keyword(s):  
Semiconductor Lasers ◽  
Near Infrared ◽  
Beam Quality ◽  
Laser Beams ◽  
Modal Composition ◽  
Wavefront Analysis ◽  
Measurement And Analysis ◽  
Laser Sources ◽  
Insight Into

AbstractIn order to analyze the beam quality of laser sources wavefront measurements using a Shack–Hartmann sensor became an established way. With the detection of the wavefront deflection a change of the modal composition of the laser beam can be recorded directly. While this method is well known for nearly Gaussian laser beams, the wavefront analysis of broadarea semiconductor lasers is an open field of current research. Detailed analysis of the wavefront gives an additional path to get an insight into the transverse modal composition of semiconductor lasers, which have a dominant impact on the output parameters of the devices. For the presented investigations lasers emitting light in the near infrared (

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 Влияние побочных дифракционных порядков на качество изображения, формируемого рефракционно-дифракционной оптической системой среднего ИК диапазона

2021 ◽  
Vol 129 (4) ◽  
pp. 378
Author(s):  
Г.И. Грейсух ◽  
Е.Г. Ежов ◽  
О.А. Захаров ◽  
С.В. Казин
Keyword(s):  
Computer Simulation ◽  
Image Quality ◽  
Diffraction Efficiency ◽  
Spectral Range ◽  
Optical System ◽  
Optical Axis ◽  
Single Layer ◽  
Central Wavelength ◽  
Relief Phase

The image formed by a refractive-diffractive optical system for the mid-IR range (3–5 µm) is investigated. The effect of the side diffraction orders of the diffractive corrector on the quality of this image near the optical axis is estimated both by computer simulation and experimentally. It is shown that the side diffraction orders of a single-layer sawtooth relief-phase microstructure will not noticeably affect the image quality under the following condition: the diffraction efficiency of the microstructure at the central wavelength of the operating spectral range is close to unity, and within the entire indicated spectral range it does not drop below 0.67.

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.

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