Generation of the periodically polarized structured light beams

Sun, Xinde; Liu, Lanqin; Huang, Wanqing; Zhang, Ying; Wang, Wenyi; Zheng, Tianran; Feng, Xi; Geng, Yaoxiang; Zhu, Qihua

doi:10.1364/oe.25.021460

Cited by 4 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First of all, CR has nonconventional beam evolution pattern 6 , which is used for all-optical image processing 7 , high-resolution microscopy 8 – 10 , ultra-efficient CR lasing 11 – 14 , and, moreover, for optical manipulation and actuation of physical objects and particle trapping/tweezing by means of CR ring distribution 15 – 18 , Raman spots 16 , 18 and CR bottle beam structure 19 – 21 . Secondly, this is a spatially nonuniform polarization structure 22 , which can be beneficial for optical polarization converters 23 , multiplexed systems 24 , formation of mono- or polychromatic structured light 25 – 27 , polarimetric measurements 28 – 30 and optical sensors 31 . And thirdly, CR wavefront possess the nontrivial helical properties associated with fractional orbital angular momentum (OAM) 32 .…”

Section: Introductionmentioning

confidence: 99%

Partially coherent conical refraction promises new counter-intuitive phenomena

Mylnikov

Dudelev

Рафаилов

et al. 2022

Sci Rep

View full text Add to dashboard Cite

In this paper, we extend the paraxial conical refraction model to the case of the partially coherent light using the unified optical coherence theory. We demonstrate the decomposition of conical refraction correlation functions into well-known conical refraction coherent modes for a Gaussian Schell-model source. Assuming randomness of the electrical field phase of the input beam, we reformulated and significantly simplified the rigorous conical refraction theory. This approach allows us to consider the propagation of light through a conical refraction crystal in exactly the same way as in the classical case of coherent radiation. Having this in hand, we derive analytically the conical refraction intensity both in the focal plane and in the far field, which allows us to explain and rigorously justify earlier experimental findings and predict new phenomena. The last include the counterintuitive effect of narrowing of the conical refraction ring width, disappearance of the dark Poggendorff’s ring in the Lloyd’s plane, and shift of Raman spots for the low-coherent conical refraction light. We also demonstrate a universal power-law dependence of conical refraction cones coherence degree on the input correlation length and diffraction-free propagation of the low-coherent conical refraction light in the far field.

show abstract

Section: Introductionmentioning

confidence: 99%

Partially coherent conical refraction promises new counter-intuitive phenomena

Mylnikov

Dudelev

Рафаилов

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The further manipulation of SoP were realized, with the multiple-concentric-rings intensity distribution. Based on the characters of the conical refraction, in our previous research in 2017 26 , one kind of structured light beam with periodical polarization and phase singularities was theoretically and experimentally obtained from a setup consisting of conical refraction transformation and 4f-system. This beam was verified to be one kind of full Poincaré beams in the research 27 , and the effects of using cascade biaxial crystals on the manipulation of polarization was investigated.…”

Section: Introductionmentioning

confidence: 99%

Unitary transformation for Poincaré beams on different parts of Poincaré sphere

Sun

Geng

Zhu

et al. 2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

We construct an experimental setup, consisting of conical refraction transformation in two biaxial cascade crystals and 4f-system, to realize Unitary transformation of light beam and the manipulation of Poincaré beams on the different parts of Poincaré sphere. The spatial structure of the polarization can be controlled by changing the polarization of the incident beam or rotating the angle between these two crystals. The beams with different SoPs covering the full-Poincaré sphere, part-Poincaré sphere and one point on the sphere are generated for the different angles between crystals. The Unitary transformation of light beam is proposed in the experiment with the invariant intensity distribution. Subsequently, the spin angular momentum is derived from the distribution of polarization measured in our experiment. Moreover, the conversion between orbital angular momentum and spin angular momentum of light beam is obtained by changing the angle between crystals. And the conversion progress can also be influenced by the polarization of incident beam. We realized the continuous control of the spatial structure of the angular momentum density, which has potential in the manipulation of optical trapping systems and polarization-multiplexed free-space optical communication. Up to now, as an intrinsic and fundamental vectorial nature of light, the SoP has attracted wide attention owing to its important role in propagation behaviors, focusing properties, and light-matter interactions. In 2010, Beckely introduced and demonstrated one kind of novel vector beams, named full Poincaré (FP) beams, in the experiment 1,2. One dominant characteristic of FP beams is that the states of polarization (SoPs) in the crosssection cover the entire surface of Poincaré sphere. As a result, any SoP on Poincaré sphere can be found in the FP beams Due to the special SoP distribution, The FP beams have potential for many practical applications in beam shaping 34 , manipulation of particles 5 , generating transverse spin angular momentum 6-8 and significantly reducing turbulence-induced scintillation 9,10. High-order FP beams have been proposed to have benefit in achieving a smooth flat-top transverse profile with steep edge roll-off 11,12. The orders herein are determined by the number of times that the SoP covers all possible polarization states over a Poincaré sphere. Accordingly, there are numerous methods and devices proposed in previous researches for generating the FP beams to achieve further applications, including spatial light modulators 13-15 , uniaxial crystals 16,17 , q-plates and dielectric metasurface 18-20 , geometric phase control inside a laser cavity 21 , and so forth. Conical refraction was demonstrated to be a method to manipulate the SoP of beams as an intrinsic property of biaxial crystals. The cascade conical diffraction phenomenon was comprehensively studied in detail elsewhere 22-25. The further manipulation of SoP were realized, with the multiple-concentric-rings intensity distribution. Based on the characters of the con...

show abstract

“…In traditional methods, the modulation of the SoP would result in the variance of the intensity distribution. In our previous research [25], a converter consisting of a BC and a 4f-system was proposed to achieve the manipulation of the SoP. In this study, two cascade crystals of same length are employed to manipulate the SoP in more degree of freedom.…”

Section: Introductionmentioning

confidence: 99%

Unitary transformation in polarization of vector beams via biaxial cascade crystals

Sun

Liu

Zhu

et al. 2019

J. Opt.

Self Cite

View full text Add to dashboard Cite

This research establishes a polarization converter consisting of biaxial cascade crystals and a 4f system. The polarization manipulation of vector beams is investigated theoretically. This paper develops an analytical model for the vector beams created by biaxial cascade crystals based on Belsky–Khapalyuk–Berry paraxial theory. The transformation of the electric field caused by conical refraction is verified to be a unitary transformation, resulting in the inhomogeneous state of polarization with the intensity distribution remaining invariant. The numerical simulation results show that the state of polarization varies with incident polarization and the angle between cascade crystals. In particular, for the angle of zero, the exit beam has the state of polarization covering the whole Poincaré sphere. Moreover, the part-Poincaré beams are generated by rotating the crystal around the optics axis. The details of the state of polarization are mapped on the Poincaré sphere to analyze the distribution rule. This method has the potential to extend the coding degree of freedom for optical communication and the diversity of light and matter interactions. The unitary transformation may have great value in research about optical neural networks.

show abstract

Generation of the periodically polarized structured light beams

Cited by 4 publications

References 29 publications

Partially coherent conical refraction promises new counter-intuitive phenomena

Partially coherent conical refraction promises new counter-intuitive phenomena

Unitary transformation for Poincaré beams on different parts of Poincaré sphere

Unitary transformation in polarization of vector beams via biaxial cascade crystals

Contact Info

Product

Resources

About