Intracavity beam shaping for nanoscale surface metrology

2003 ◽  
Author(s):  
Boris Spektor ◽  
Yurij Parkhomenko ◽  
Josef Shamir
Keyword(s):  
Beam Shaping ◽  
Surface Metrology

Research progress of high-precision surface metrology of a K-B mirror

2020 ◽  
Vol 13 (4) ◽  
pp. 660-675
Author(s):  
ZHANG Shuai ◽  
◽  
◽  
HOU Xi ◽  
◽  
...  
Keyword(s):  
High Precision ◽  
Research Progress ◽  
Surface Metrology

Beam shaping for optimum illumination patterns

1968 ◽  
Vol 4 (23) ◽  
pp. 502
Author(s):  
S. Cornbleet
Keyword(s):  
Beam Shaping

scholarly journals Beam Shaping by a Magnetic Fluid Deformable Mirror With Curved Trajectory for Optical Tweezer System

IEEE Access ◽  
2021 ◽  
Vol 9 ◽  
pp. 121645-121653
Author(s):  
Xiang Wei ◽  
Yongjun Yang ◽  
Dziki Mbemba ◽  
Feng Li ◽  
Zhizheng Wu ◽  
...  
Keyword(s):  
Magnetic Fluid ◽  
Optical Tweezer ◽  
Beam Shaping ◽  
Deformable Mirror

scholarly journals Nano-imprinted subwavelength gratings as polarizing beamsplitters

2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Julian Wüster ◽  
Yannick Bourgin ◽  
Patrick Feßer ◽  
Arne Behrens ◽  
Stefan Sinzinger
Keyword(s):  
Nanoimprint Lithography ◽  
Optical Measurement ◽  
Design Method ◽  
Optical Systems ◽  
Surface Metrology ◽  
Measurement Systems ◽  
Common Path ◽  
Dielectric Coatings ◽  
Subwavelength Gratings ◽  
Wide Range

AbstractPolarizing beamsplitters have numerous applications in optical systems, such as systems for freeform surface metrology. They are classically manufactured from birefringent materials or with stacks of dielectric coatings. We present a binary subwavelength-structured form-birefringent diffraction grating, which acts as a polarizing beamsplitter for a wide range of incidence angles −30∘…+30∘. We refine the general design method for such hybrid gratings. We furthermore demonstrate the manufacturing steps with Soft-UV-Nanoimprint-Lithography, as well as the experimental verification, that the structure reliably acts as a polarizing beamsplitter. The experimental results show a contrast in efficiency for TE- and TM-polarization of up to 1:18 in the first order, and 34:1 in the zeroth order. The grating potentially enables us to realize integrated compact optical measurement systems, such as common-path interferometers.

scholarly journals Convolutional neural network as a tool for automatic alignment of electron optical beam shaping devices

2021 ◽  
Vol 27 (S1) ◽  
pp. 822-824
Author(s):  
Enzo Rotunno ◽  
Amir Tavabi ◽  
Paolo Rosi ◽  
Stefano Frabboni ◽  
Peter Tiemeijer ◽  
...  
Keyword(s):  
Neural Network ◽  
Convolutional Neural Network ◽  
Beam Shaping ◽  
Optical Beam ◽  
Automatic Alignment

scholarly journals Holographic Display System to Suppress Speckle Noise Based on Beam Shaping

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 204
Author(s):  
Di Wang ◽  
Yi-Wei Zheng ◽  
Nan-Nan Li ◽  
Qiong-Hua Wang
Keyword(s):  
Optical Element ◽  
Speckle Noise ◽  
Beam Shaping ◽  
Diffractive Optical Element ◽  
The Other ◽  
Spatial Light Modulators ◽  
Viewing Angle ◽  
Display System ◽  
Holographic Display ◽  
Light Modulators

In this paper, a holographic system to suppress the speckle noise is proposed. Two spatial light modulators (SLMs) are used in the system, one of which is used for beam shaping, and the other is used for reproducing the image. By calculating the effective viewing angle of the reconstructed image, the effective hologram and the effective region of the SLM are calculated accordingly. Then, the size of the diffractive optical element (DOE) is calculated accordingly. The dynamic DOEs and effective hologram are loaded on the effective regions of the two SLMs, respectively, while the wasted areas of the two SLMs are performed with zero-padded operations. When the laser passes through the first SLM, the light can be modulated by the effective DOEs. When the modulated beam illuminates the second SLM which is loaded with the effective hologram, the image is reconstructed with better quality and lower speckle noise. Moreover, the calculation time of the hologram is reduced. Experiments indicate the validity of the proposed system.

scholarly journals Anti-Reflection Nanostructures on Tempered Glass by Dynamic Beam Shaping

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 289
Author(s):  
Petr Hauschwitz ◽  
Jan Brajer ◽  
Danijela Rostohar ◽  
Jaromír Kopeček ◽  
Tomáš Mocek ◽  
...  
Keyword(s):  
Mobile Phones ◽  
Thermal Damage ◽  
Pulsed Laser ◽  
Processing Parameters ◽  
Beam Shaping ◽  
Separation Distance ◽  
Tempered Glass ◽  
Fundamental Wavelength ◽  
Speed Up ◽  
Scanning Head

Reflectivity and surface topography of tempered glass were modified without any thermal damage to the surroundings by utilizing 1.7 ps ultrashort pulsed laser on its fundamental wavelength of 1030 nm. To speed up the fabrication, a dynamic beam shaping unit combined with a galvanometer scanning head was applied to divide the initial laser beam into a matrix of beamlets with adjustable beamlets number and separation distance. By tuning the laser and processing parameters, reflected intensity can be reduced up to 75% while maintaining 90% of transparency thus showing great potential for display functionalization of mobile phones or laptops.

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