scholarly journals Tunable Axicons Generated by Spatial Light Modulator with High-Level Phase Computer-Generated Holograms

2020 ◽  
Vol 10 (15) ◽  
pp. 5127 ◽  
Author(s):  
Zhongsheng Zhai ◽  
Zhuang Cheng ◽  
Qinghua Lv ◽  
Xuanze Wang
Keyword(s):  
Spatial Light Modulator ◽  
Optical Element ◽  
Fresnel Diffraction ◽  
Zero Order ◽  
Light Modulator ◽  
Bessel Beams ◽  
Computer Generated Holograms ◽  
Diffraction Patterns ◽  
High Level ◽  
Hollow Beams

Axicon is an interesting optical element for its optical properties. This paper presents an approach to dynamically generated tunable axicons with a spatial light modulator (SLM). 256-level phase computer-generated holograms (CGHs) were loaded into the SLM to simulate the positive and negative axicons. The intensity distributions of beams passing through these axicons were analyzed with the principle of blazed grating and Fresnel diffraction; and the diffraction patterns were obtained theoretically in terms of zero-order Bessel beams and annular hollow beams, corresponding to the positive and negative axicons, respectively. Experimental results verified that the diffraction patterns have the same distribution as the real axicon. The types of the axicon and the axicon’s parameters can be easily altered through changing the CGHs.

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.

Optimal trap velocity in a dynamic holographic optical trap using a nematic liquid crystal spatial light modulator

2022 ◽  
Author(s):  
Karuna Sindhu Malik ◽  
Bosanta Ranjan Boruah
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Spatial Light Modulator ◽  
Optical Trap ◽  
Optical Element ◽  
Optical Traps ◽  
Light Modulator ◽  
Step Size ◽  
Microscopic Object ◽  
Optimal Velocity

Abstract A dynamic holographic optical trap uses a dynamic diffractive optical element such as a liquid crystal spatial light modulator to realize one or more optical traps with independent controls. Such holographic optical traps provide a number of flexibilities and conveniences useful in various applications. One key requirement for such a trap is the ability to move the trapped microscopic object from one point to the other with the optimal velocity. In this paper we develop a nematic liquid crystal spatial light modulator based holographic optical trap and experimentally investigate the optimal velocity feasible for trapped beads of different sizes, in such a trap. Our results show that the achievable velocity of the trapped bead is a function of size of the bead, step size, interval between two steps and power carried by the laser beam. We observe that the refresh rate of a nematic liquid crystal spatial light modulator is sufficient to achieve an optimal velocity approaching the theoretical limit in the respective holographic trap for beads with radius larger than the wavelength of light.

Using the spatial light modulator as a binary optical element: application to spatial beam shaping for high-power lasers

2018 ◽  
Vol 57 (24) ◽  
pp. 7060 ◽  
Author(s):  
Sensen Li ◽  
Lei Ding ◽  
Pengyuan Du ◽  
Zhiwei Lu ◽  
Yulei Wang ◽  
...  
Keyword(s):  
High Power ◽  
Spatial Light Modulator ◽  
Optical Element ◽  
Beam Shaping ◽  
Light Modulator ◽  
High Power Lasers ◽  
Spatial Beam

Elimination of a zero-order beam induced by a pixelated spatial light modulator for holographic projection

2009 ◽  
Vol 48 (30) ◽  
pp. 5834 ◽  
Author(s):  
Hao Zhang ◽  
Jinghui Xie ◽  
Juan Liu ◽  
Yongtian Wang
Keyword(s):  
Spatial Light Modulator ◽  
Zero Order ◽  
Light Modulator

scholarly journals Sagnac Interferometer Based Generation of Controllable Cylindrical Vector Beams

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Cristian Acevedo ◽  
Angela Guzmán ◽  
Yezid Torres Moreno ◽  
Aristide Dogariu
Keyword(s):  
Spatial Light Modulator ◽  
Continuous Control ◽  
Sagnac Interferometer ◽  
Light Modulator ◽  
Polarized Beams ◽  
Vector Beams ◽  
Computer Generated Holograms ◽  
Orthogonal Beams ◽  
Experimental Geometry ◽  
Topological Charges

We report on a novel experimental geometry to generate cylindrical vector beams in a very robust manner. Continuous control of beams’ properties is obtained using an optically addressable spatial light modulator incorporated into a Sagnac interferometer. Forked computer-generated holograms allow introducing different topological charges while orthogonally polarized beams within the interferometer permit encoding the spatial distribution of polarization. We also demonstrate the generation of complex waveforms obtained by combining two orthogonal beams having both radial modulations and azimuthal dislocations.

Modulated Plasma Waveguides Generated by Intense Bessel Beams Patterned with a Spatial Light Modulator

CLEO: 2014 ◽  
2014 ◽  
Author(s):  
G. A. Hine ◽  
A. J. Goers ◽  
S. J. Yoon ◽  
J. A. Elle ◽  
H. M. Milchberg
Keyword(s):  
Spatial Light Modulator ◽  
Light Modulator ◽  
Bessel Beams ◽  
Plasma Waveguides
Sign in / Sign up

Export Citation Format

Share Document