Uniform illumination by diffractive shaping of independent light beams

Sobczyk, Artur; Sypek, Maciej; Makowski, Michał; Siemion, Agnieszka; Suszek, Jarosław; Kołodziejczyk, Andrzej

doi:10.2478/s11772-011-0006-6

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…The beam compression lens, which is placed perpendicular to the direction of the optical system, is responsible for compressing the other direction of the beam. Because the beam also has a certain divergence angle on the exit end face of the total reflection integral cavity, the spot shape is a general elliptic spot, and its size increases rapidly with the increase of the propagation distance [9] . However, the height of the sheet beam used in PLIF experiment is required to remain unchanged in the detection area, and the thickness is kept in the order of hundreds of millimeters.…”

Section: The Overall Design Of the Optical Systemmentioning

confidence: 99%

Optical system design of sheet-beam energy homogenization based on total reflection integral cavity

Song

Zhen

Zhang

et al. 2023

AOPC 2022: Advanced Laser Technology and Applications

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Planar laser-induced fluorescence (PLIF) has been widely used in the two-dimensional (2D) accurate measurements of important combustion parameters due to its high spatiotemporal resolution. One of the problems encountered by PLIF technology is that the current beam shaping technology cannot get a sheet beam that meets the measurement requirements. In order to solve this problem, a new sheet-forming homogenization optical system with long focal-depth is proposed and designed based on total reflection integral cavity. By making the incident Gaussian beam reflected multiple times in the integral cavity, the output beam of single direction homogenization can be obtained. The beam is then passed through a beam expansion collimation system and compressed in the other direction. Finally, the shaping sheet-beam with high uniformity is realized. Based on this principle, the ZEMAX is used to simulate the optical system operating at 283.553nm, and it is found that the effect of the final beam shaping is mainly affected by the entry pupil deviation of the incident laser, the integral cavity length and the angle between two reflecting surfaces of an integrating cavity. After optimizing design parameters, a sheet-beam energy homogenization optical system based on total reflection integral cavity is designed. Finally, the homogeneity evaluation factor is introduced to calculate the homogeneity of output beam quantitatively and it is found that the uniformity of the beam is more than 90%. The sheet-beam can better meet the practical requirements of PLIF measurement.

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Section: The Overall Design Of the Optical Systemmentioning

confidence: 99%

Optical system design of sheet-beam energy homogenization based on total reflection integral cavity

Song

Zhen

Zhang

et al. 2023

AOPC 2022: Advanced Laser Technology and Applications

View full text Add to dashboard Cite

show abstract

“…From physical point of view, light phase distribution in the output aperture has to be determined from the far−field and initial (in the aperture) intensity distribution. This kind of problem can be solved by the application of computational methods developed in the field of digital holography -Iterative Fou− rier Transform Algorithm (IFTA), simulated annealing, generic algorithms, Dammann grating approach (DG), but also traditional multi−variable optimization approach like the least squares or orthogonal descent methods can be applied [14][15][16][17][18][19]. In our research IFTA proved to be the most effective way.…”

Section: Theoretical Approachmentioning

confidence: 99%

Diffractive wavefront correction of remote sensing systems based on pulsed laser diodes

Wojtanowski

Traczyk

Mierczyk

et al. 2015

Opto-Electronics Review

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A variety of optoelectronic devices (rangefinders, velocity meters, terrestrial scanners, lidars, free space optics communication systems and others) based on semiconductor laser technology feature low−quality and highly asymmetric beams. It results from optical characteristics of the applied high−peak−power pulsed laser sources, which in most cases are composed of several laser chips, each containing one or a few active lasers. Such sources cannot be considered as coherent, so the resultant beam is formed by the superposition of many optically uncorrelated sub-sources. Far−field distribution of laser spots in such devices corresponds to the shape of laser emitting area, which instead of desired symmetry shows layout composed of one or several discrete lines or rectangles. In some applications, especially if small targets are concerned, it may be crucial to provide more symmetrical and uniform laser beam cross−section. In the paper, the novel strategy of such correction, combining coherent and incoherent approaches, is presented. All aspects of technological implementations are discussed covering general theoretical treatment of the problem, diffractive optical element (DOE) design in the form of computer generated hologram (CGH), its fabrication and testing in case of selected laser module beam correction.

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Polarization-dependent phase-modulation metasurface for vortex beam (de)multiplexing

Zeng

Wang

et al. 2023

Nanophotonics

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Vortex beams (VBs) carrying orbital angular momentum (OAM) have shown promising potential in enhancing communication capacity through the possession of multiple multiplexing dimensions involving the OAM mode, polarization, and wavelength. Although many research works on multidimensional multiplexing have been conducted, the (de)multiplexer compatible with these dimensions remains elusive. Following the expanded concept of the Pancharatnam–Berry (PB) phase, we designed a polarization-dependent phase-modulation metasurface to phase-modulate the two orthogonal linearly polarized components of light, and two Dammann vortex gratings with orthogonal polarization responses were loaded to simultaneously (de)multiplex OAM mode and polarization channels. As a proof of concept, we constructed a 16-channel multidimensional multiplexing communication system (including two OAM modes, two polarization states, and four wavelengths), and 400 Gbit/s quadrature-phase shift-keying (QPSK) signals were transmitted. The results demonstrate that the OAM mode and polarization channels are successfully (de)multiplexed, and the bit-error-rates (BERs) are below 1.67 × 10−6 at the received power of −15 dBm.

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Uniform illumination by diffractive shaping of independent light beams

Cited by 3 publications

References 15 publications

Optical system design of sheet-beam energy homogenization based on total reflection integral cavity

Optical system design of sheet-beam energy homogenization based on total reflection integral cavity

Diffractive wavefront correction of remote sensing systems based on pulsed laser diodes

Polarization-dependent phase-modulation metasurface for vortex beam (de)multiplexing

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