Mode analyzer for known optical vortices from a spatial light modulator with collinear holography

2021 ◽  
Author(s):  
Chen Wang ◽  
yuan ren ◽  
Tong Liu ◽  
Zhengliang Liu ◽  
song qiu ◽  
...  
Keyword(s):  
Spatial Light Modulator ◽  
Optical Vortices ◽  
Light Modulator

scholarly journals Zeroth- and first-order long range non-diffracting Gauss–Bessel beams generated by annihilating multiple-charged optical vortices

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Lyubomir Stoyanov ◽  
Maya Zhekova ◽  
Aleksander Stefanov ◽  
Ivan Stefanov ◽  
Gerhard G. Paulus ◽  
...  
Keyword(s):  
Long Range ◽  
Spatial Light Modulator ◽  
Width Ratio ◽  
Optical Vortices ◽  
Large Radius ◽  
Light Modulator ◽  
Bessel Beams ◽  
First Order ◽  
Shaped Beam ◽  
Phase Profile

AbstractWe demonstrate an alternative approach for generating zeroth- and first-order long range non-diffracting Gauss–Bessel beams (GBBs). Starting from a Gaussian beam, the key point is the creation of a bright ring-shaped beam with a large radius-to-width ratio, which is subsequently Fourier-transformed by a thin lens. The phase profile required for creating zeroth-order GBBs is flat and helical for first-order GBBs with unit topological charge (TC). Both the ring-shaped beam and the required phase profile can be realized by creating highly charged optical vortices by a spatial light modulator and annihilating them by using a second modulator of the same type. The generated long-range GBBs are proven to have negligible transverse evolution up to 2 m and can be regarded as non-diffracting. The influences of the charge state of the TCs, the propagation distance behind the focusing lens, and the GBB profiles on the relative intensities of the peak/rings are discussed. The method is much more efficient as compared to this using annular slits in the back focal plane of lenses. Moreover, at large propagation distances the quality of the generated GBBs significantly surpasses this of GBBs created by low angle axicons. The developed analytical model reproduces the experimental data. The presented method is flexible, easily realizable by using a spatial light modulator, does not require any special optical elements and, thus, is accessible in many laboratories.

scholarly journals Generation of Optical Vortices by Linear Phase Ramps

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Sunil Vyas
Keyword(s):  
Numerical Simulation ◽  
Intensity Distribution ◽  
Spatial Light Modulator ◽  
Phase Mask ◽  
Computational Techniques ◽  
Optical Vortices ◽  
Vortex Generation ◽  
Linear Phase ◽  
Light Modulator ◽  
Phase Discontinuity

Generation of optical vortices using linear phase ramps is experimentally demonstrated. When two regions of a wavefront have opposite phase gradients then along the line of phase discontinuity vortices can be generated. It is shown that vortices can evolve during propagation even with the unequal magnitude of tilt in the two regions of the wavefront. The number of vortices and their location depend upon the magnitude of tilt. vortex generation is experimentally realized by encoding phase mask on spatial light modulator and their presence is detected interferometrically. Numerical simulation has been performed to calculate the diffracted intensity distribution from the phase mask, and presence of vortices in the diffracted field is detected by computational techniques.

Multiple optical vortices generated by azimuthal fractal spiral zone plates based on liquid crystal spatial light modulator

Optik ◽  
2018 ◽  
Vol 175 ◽  
pp. 344-350 ◽  
Author(s):  
Huaping Zang ◽  
Chenglong Zheng ◽  
Ziwen Ji ◽  
Xiaomin Liu ◽  
Yongzhi Tian ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Spatial Light Modulator ◽  
Optical Vortices ◽  
Light Modulator ◽  
Zone Plates

scholarly journals Spatial Manipulation of a Supercontinuum Beam for the Study of Vortex Interference Effects

2020 ◽  
Vol 10 (6) ◽  
pp. 1966
Author(s):  
Matthew E. Anderson ◽  
Alejandra Serrano ◽  
Cory Stinson ◽  
Antonio Talamantes ◽  
Nick Miller ◽  
...  
Keyword(s):  
Spatial Light Modulator ◽  
Image Plane ◽  
Wide Frequency Range ◽  
Ultrafast Laser ◽  
Optical Vortices ◽  
Interference Effects ◽  
Color Patterns ◽  
Frequency Range ◽  
Light Modulator ◽  
Spatial Interference

In this work, we generate optical vortices from the supercontinuum output of an ultrafast laser interacting with a micro-structured fiber. Using a segmented spatial light modulator, multiple vortices are designed and dynamically generated and shifted in order to observe their superposition in the image plane. It is shown that single-color patterns of exquisite complexity can be generated across a wide frequency range. Multi-color interference patterns are experimentally generated and compared to the results of computer simulations. Multiple vortices of varying colors are also generated and independently controlled, demonstrating that no spatial interference occurs. Experimental results are compared with theoretical and numerical simulations, showing excellent agreement.

scholarly journals Generation of Perfect Optical Vortices by Using a Transmission Liquid Crystal Spatial Light Modulator

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Nelson Anaya Carvajal ◽  
Cristian H. Acevedo ◽  
Yezid Torres Moreno
Keyword(s):  
Liquid Crystal ◽  
Topological Charge ◽  
Spatial Light Modulator ◽  
Propagation Distance ◽  
Optical Vortex ◽  
Optical Vortices ◽  
Light Modulator ◽  
Intensity Pattern ◽  
Fourier Plane ◽  
Spiral Phase

We have experimentally created perfect optical vortices by the Fourier transformation of holographic masks with combination of axicons and spiral functions, which are displayed on a transmission liquid crystal spatial light modulator. We showed theoretically that the size of the annular vortex in the Fourier plane is independent of the spiral phase topological charge but it is dependent on the axicon. We also studied numerically and experimentally the free space diffraction of a perfect optical vortex after the Fourier back plane and we found that the size of the intensity pattern of a perfect optical vortex depends on the topological charge and the propagation distance.

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