The new PLUTO-2.1-TELCO-142 Spatial Light Modulator replaces the former TELCO-059 version.
The new LCoS display version features a dielectric mirror coating and an optimized LC design which increases the reflectivity to 93%. Furthermore the diffraction efficiency is also improved.
The PLUTO-2.1 Spatial Light Modulator plattform includes 12 versions which (more…)
The new analogue phase only Spatial Light Modulator extends HOLOEYE´s broad SLM product range for applications with demanding requirements. The SLM delivers extreme phase stability, low latency, and low crosstalk.
The ERIS SLM is based on an 0.717″ LCOS-microdisplay with a resolution of 1920×1200 pixels and 8µm pixel pitch. (more…)
Author(s):
Guo, Yong; Wang, Luwei; Zhu, Yinru; Gao, Xinwei; Weng, Xiaoyu; Liu, Jinyuan; Yan, Wei & Qu, Junle
Abstract:
“The non-diffracting Airy beams have been reported to increase acquisition speed by projecting the axially significantly elongated information to a two-dimensional (2D) image. Due to the elongated focal length, an Airy volumetric image can cover information as much as stack images with multiple Gaussian images at different imaging depths, which significantly increases the volumetric imaging rate. However, the projection of three-dimensional (3D) structures on a 2D plane is usually indistinguishable, especially those that overlap along the axis. Therefore, we proposed an axially resolved volume imaging technique based on a two-photon fluorescence lifetime microscopy imaging (FLIM) by using Airy beams.”
Author(s):
Enar Franco, Óscar Martínez-Matos, and José A. Rodrigo
Abstract:
“Structured ultrashort laser pulses with controlled spatiotemporal properties are emerging as a key tool for the study and application of light–matter interactions in different fields such as microscopy, time-resolved imaging, laser micromachining, particle acceleration, and attosecond science. In practice, a structured ultrashort pulse focused along a target trajectory with controlled pulse dynamics is required, e.g., to set the trajectory and velocity of the resulting intensity peak. Here, to address this challenging problem, we present a technique and experimental setup that allows straightforward engineering of structured ultrashort laser pulses with control of their spatiotemporal properties enabling tailored pulse propagation dynamics along the target trajectory. Our theoretical framework describes the design and control of this kind of curve-shaped laser pulse in terms of the curve geometry and phase prescribed along it. We have derived a closed-form expression that describes the interplay between the curve geometry and prescribed phase governing the pulse dynamics, including the temporal behavior of the pulse peak intensity while preserving the pulse duration. The theoretical results and the corresponding numerical simulations allow us to analyze the pulse dynamics on the example of femtosecond curve-shaped vortex pulses, including contour-shaped pulses created to follow the outline of objects at micrometer scale. The experimental results demonstrate the generation of these structured ultrashort pulses. These findings could pave the way for the next generation of ultrashort laser-based optical tools for the study and control of light–matter interactions.”
Author(s):
Xu, Ning; Bohndiek, Sarah E.; Li, Zexing; Zhang, Cilong & Tan, Qiaofeng
Abstract:
“Point-scanning microscopy approaches are transforming super-resolution imaging. Despite achieving parallel high-speed imaging using multifocal techniques, efficient multicolor capability with high-quality illumination is currently lacking. In this paper, we present for the first time Mechanical-scan-free and multi-Color Super-resolution Microscopy (MCoSM) by spot array illumination, which enables mechanical-scan-free super-resolution
imaging with adjustable resolution and field of view (FoV) based on spatial light modulators (SLMs). Through 100s-10,000s super-resolution spot illumination with different FoV for imaging, we demonstrate the adjustable capacity of MCoSM. MCoSM extends current spectral imaging capabilities through a time-sharing process of different color illumination with phase-shifting scanning, while retaining the spatial flexibility of super-resolution imaging with diffractive spot array illumination. To showcase the prospects for further combining MCoSM with multi-color imaging, we also perform spectral unmixing (four-colors) on images of fluorescent beads at high resolution. MCoSM provides a versatile platform
for studying molecular interactions in complex samples at the nanoscale level.”
Author(s):
Zeng, Shihao; Zhang, Yanfeng; Liu, Junyi; Lin, Zhenrui; Lin, Zhongzheng; Chen, Hongjia; Liu, Jie & Yu, Siyuan
Abstract:
“Optical wireless communication is an attractive technique for data center interconnects due to its low latency line-of-sight connectivity. Multicast, on the other hand, is an important data center network function that can improve traffic throughput, reduce latency, and make efficient use of network resources. To enable reconfigurable multicast in data center optical wireless networks, we propose a novel 360° optical beamforming scheme based on the principle of superposition of orbital angular momentum modes, emitting beams from the source rack pointing towards any combination of other racks so that connections are established between the source and multiple destination racks. We experimentally demonstrate the scheme using solid state devices for a scenario where racks are arranged in a hexagonal formation in which a source rack can connect with any number of adjacent racks simultaneously, with each link transmitting 70 Gb/s on-off-keying modulations at bit error rates of <10−6 at 1.5-m and 2.0-m link distances.”
Author(s):
Khuderchuluun, Anar; Dashdavaa, Erkhembaatar; Rupali, Shindae; Kwon, Ki-Chul; Kang, Hoonjong; Lee, Kwon-Yeon & Kim, Nam
Abstract:
“In this paper, color optimization of a full-color holographic stereogram printing system using a single SLM based on iterative exposure is proposed. First, an array of sub-holograms (hogels) is generated effectively within fast computergenerated integral imaging, and fully analyzed phase-modulation for red, green, and blue (RGB) channels of hogel. Then, the generated hogels are recorded into holographic material sequentially where SLM displays the R, G, and B channels of a single hogel via effectual exposure under synchronized control with three electrical shutters for RGB laser illumination to obtain verified color optimization. Numerical simulation and optical reconstructions are implemented.”
Author(s):
Yudaev, Andrey; Kiselev, Alexander; Shashkova, Inna; Tavrov, Alexander; Lipatov, Alexander & Korablev, Oleg
Abstract:
“We implemented the common-path achromatic interfero-coronagraph both for the wavefront sensing and the on-axis image component suppression, aiming for the stellar coronagraphy. A common-path achromatic interfero-coronagraph has its optical scheme based on a nulling rotational-shear interferometer. The angle of rotational shear can be chosen at a small angular extent of about 10 deg. Such a small angular shear maintains the coronagraphic contrast degradation known as the stellar leakage effect, caused by a finite stellar size. We study the phase and amplitude wavefront control by a liquid crystal spatial light modulator of reflection type which is used as the pixilated active adaptive optics unit. Therefore, adaptive optics perform a wavefront-correcting input toward a stellar interfero-coronagraph aiming at the direct exoplanet imaging. Presented here are both the numeric evaluations and the lab experiment stand to prove the declared functionality output.”
Author(s):
Quan, Jiale; Yan, Binbin; Sang, Xinzhu; Zhong, Chongli; Li, Hui; Qin, Xiujuan; Xiao, Rui; Sun, Zhi; Dong, Yu & Zhang, Huming
Abstract:
“In this paper, we propose a method to generate multi-depth phase-only holograms using
stochastic gradient descent (SGD) algorithm with weighted complex loss function and masked multi-
layer diffraction. The 3D scene can be represented by a combination of layers in different depths. In
the wave propagation procedure of multiple layers in different depths, the complex amplitude of
layers in different depths will gradually diffuse and produce occlusion at another layer. To solve this
occlusion problem, a mask is used in the process of layers diffracting. Whether it is forward wave
propagation or backward wave propagation of layers, the mask can reduce the occlusion problem
between different layers. Otherwise, weighted complex loss function is implemented in the gradient
descent optimization process, which analyzes the real part, the imaginary part, and the amplitude
part of the focus region between the reconstructed images of the hologram and the target images. The
weight parameter is used to adjust the ratio of the amplitude loss of the focus region in the whole
loss function. The weight amplitude loss part in weighted complex loss function can decrease the
interference of the focus region from the defocus region. The simulations and experiments have
validated the effectiveness of the proposed method.”
Author(s):
Wilm, Tobias; Wieland, Max; Fiess, Reinhold & Stork, Wilhelm
Abstract:
“We present highly transparent, wave front printed volume holographic optical elements (vHOEs), realized with a new recording method based on the pre-illumination of incoherent light patterns. The introduced amplitudemodulated pattern illuminates a distinct area on the unexposed, photopolymer-based holographic recording material prior to the hologram recording sequence. The incoherent pre-illumination scheme enables a precise tuning of the material’s local photosensitivity without the formation of a holographic volume diraction grating. As a consequence, the pre-illumination exposure signicantly suppresses the formation of transparency diminishing structures in the material that are formed concurrently with the volume diraction grating during the hologram recording sequence. The pre-illumination component is integrated in an extended immersion-based wave front printing setup, which realizes vHOEs by sequentially recording single holographic elements in an array-like structure. A wide range of dierent recording congurations is enabled by our recording setup due to independent modulation of both wave fronts and the possibility to realize large o-axis recording angles. We introduce two hologram characterization methods, based on a diraction eciency and a slanted-edge method analysis, which are used to evaluate the implemented pre-illumination method and demonstrate signicant improvements to the see-through quality of the presented wave front recorded vHOEs.”