- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Holographic Femtosecond Laser Processing for Fabricating Three-Dimensional Structures; ホログラフィックフェムト秒レーザー加工による3次元微細構造の作製;
摘要： Holographic Femtosecond Laser Processing for Fabricating Three-Dimensional Structures
关键词： Spatial Light Modulator,3D Printing,3D Device,Computer-Generated Hologram
更新于2025-09-12 10:27:22
-
High-precision femtosecond laser beam shaping in material processing
摘要： Laser beam shaping is the process of modulating the amplitude and phase of a laser beam. With the development of the spatial light modulator, laser beam shaping can modulate the light field to arbitrary pattern dynamically via the computer-generated hologram (CGH). Otherwise, femtosecond laser is widely used in material processing owing to its high peak power, low hot effect and nonlinear effects. However, femtosecond laser is not strictly monochromatic, which will introduce dispersion when femtosecond laser diffracted by a spatial light modulator, and deteriorate the effect of beam shaping. Here we present a method of high-precision femtosecond laser beam shaping. Experimental results confirm that the proposed method can be used to shape femtosecond laser beams into arbitrary patterns in the whole field of view (FOV) with the resolution near the optical diffraction limit.
关键词： spatial light modulator,beam shaping,dispersion compensation,femtosecond laser,material processing
更新于2025-09-12 10:27:22
-
[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Faster Femtosecond Laser Processing using a Dual-Focus SLM Emulated Lens
摘要： The generation of multiple beams is an established method to increase the processing speed of advanced laser-based material processing techniques. This multi-foci approach has shown promising results in laser micromachining, scanning microscopy, optical data storage, or optical tweezer arrays. Of particular interest is its application to manufacturing bigger objects where laser treatment is required over surfaces on the centimetre scale or larger. Using a Spatial Light Modulator (SLM), such parallelisation has been studied over the last few years by splitting the input beam into multiple beams (up to 1000 beams [1]) for simultaneous machining on a plane perpendicular to the propagation axis. This method is primarily based on holographic femtosecond laser processing [2] where computer-generated holograms (CGH) are displayed on an SLM. Further applications include phase distortion and lens aberration correction [3], or for four-dimension light shaping [4]. The SLM provides unique features for dynamic pulse shaping, more efficient use of the laser energy, or the machining of complex shapes.
关键词： spatial light modulator,laser micromachining,computer-generated holograms,dual-focus SLM,femtosecond laser processing
更新于2025-09-12 10:27:22
-
Vector Mathieu beam profile engineering for laser material processing applications
摘要： Beam profile engineering where a desired optical intensity distribution can be generated by an array of phase shifting elements is a promising approach in laser material processing. Scalar Mathieu beams have elliptical intensity distribution perceivable as “optical knives” in the transverse plane. They exhibit non-diffracting properties similar to Bessel beams, where a relatively long focal depth retains unchanging intensity distribution, which makes Mathieu beams a promising approach in laser processing. Here, we introduce additionally vector Mathieu beams with controllable polarization and investigate numerically their spatial spectra. Further, we attempt to generate individual components of vector Mathieu beams experimentally using SLMs. We report on our achievements in the control over the beam shape and dimensions along the propagation axis.
关键词： Spatial light modulator,Nondiffracting beams,Polarization,Mathieu beams,Structured light
更新于2025-09-11 14:15:04
-
[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Phase Noise Robustness of a Coherent Spatially Parallel Optical Reservoir
摘要： Reservoir computing is a machine learning technique that is particularly adapted to process time dependent information. It is also very well suitable to experimental implementations, and in particular photonic implementations. In the present work we propose strategies to improve the phase noise robustness of a spatially parallel reservoir computer based on a coherent photonic cavity without active stabilization. The system, described in [4], is currently under development in our laboratory. It is based on a linear Fabry-Pérot resonator, with neurons encoded as a grid of 9 by 9 focused spots on the input mirror plane, and a nonlinear readout operating at 0.5GHz. The coupling between neurons is realized by a Spatial Light Modulator (SLM) placed at the back plane of the cavity and is optimized for each task. We present numerical results obtained for the 4-level channel equalization task, and we find similar results for the NARMA10 task.
关键词： Fabry-Pérot resonator,Spatial Light Modulator,phase noise robustness,Reservoir computing,photonic implementations
更新于2025-09-11 14:15:04
-
Principles and prospects for single-pixel imaging
摘要： Modern digital cameras employ silicon focal plane array (FPA) image sensors featuring millions of pixels. However, it is possible to make a camera that only needs one pixel. In these cameras a spatial light modulator, placed before or after the object to be imaged, applies a time-varying pattern and synchronized intensity measurements are made with a single-pixel detector. The principle of compressed sensing then allows an image to be generated. As the approach suits a wide a variety of detector technologies, images can be collected at wavelengths outside the reach of FPA technology or at high frame rates or in three dimensions. Promising applications include the visualization of hazardous gas leaks and 3D situation awareness for autonomous vehicles.
关键词： 3D imaging,computational imaging,spatial light modulator,compressed sensing,infrared imaging,single-pixel imaging,terahertz imaging
更新于2025-09-10 09:29:36
-
Pursuing High Quality Phase-Only Liquid Crystal on Silicon (LCoS) Devices
摘要： Fine pixel size and high-resolution liquid crystal on silicon (LCoS) backplanes have been developed by various companies and research groups since 1973. The development of LCoS is not only bene?cial for full high de?nition displays but also to spatial light modulation. The high-quality and well-calibrated panels can project computer generated hologram (CGH) designs faithfully for phase-only holography, which can be widely utilized in 2D/3D holographic video projectors and components for optical telecommunications. As a result, we start by summarizing the current status of high-resolution panels, followed by addressing issues related to the driving frequency (i.e., liquid crystal response time and hardware interface). LCoS panel qualities were evaluated based on the following four characteristics: phase linearity control, phase precision, phase stability, and phase accuracy.
关键词： spatial light modulator,phase accuracy,spatially anamorphic phenomenon,liquid-crystal-on-silicon,phase precision and stability,holographic display
更新于2025-09-10 09:29:36
-
The enhancement of the abruptly autofocusing property with multiple circular Airy beams carrying lens phase factors
摘要： To improve the abruptly autofocusing property of circular Airy beam, we propose a method to generate multiple circular Airy beams (MCAB) carrying lens phase factors using a spatial light modulator (SLM). The propagation dynamics of this kind of beam is theoretically simulated, as well as experimentally verified. It is shown that four identical beams are produced symmetrically and they can move toward the center simultaneously. By changing the lens phase information encoded in the SLM, we can achieve different focal positions and focal intensities as we want. With the same parameters, compared with a single circular Airy beam (SCAB), there are two focal planes and the abruptly autofocusing property can be greatly enhanced. It may have some applications in various fields.
关键词： circular Airy beams,lens phase factors,abruptly autofocusing property,spatial light modulator
更新于2025-09-09 09:28:46
-
A stage-scanning two-photon microscope equipped with a temporal and a spatial pulse shaper: Enhance fluorescence signal by phase shaping
摘要： Here, we present a stage-scanning two-photon microscope (2PM) equipped with a temporal pulse shaper and a spatial light modulator enabling full control over spectral and spatial phases of the exciting laser pulse. We demonstrate the capability of correcting wavefronts and temporal pulse distortions without cross-dependencies induced by optical elements at the same time enhancing the fluorescence signal. We implemented phase resolved interferometric spectral modulation for temporal pulse shaping and the iterative feedback adaptive compensation technique for spatial pulse modulation as iterative techniques. Sample distortions were simulated by cover glass plates in the optical path and by chirping the exciting laser pulses. Optimization of the spectral and spatial phases results in a signal increase of 30% and nearly complete recovery of the losses. Applying a measured spatial compensation phase within a real leaf sample shows the enhancement in contrast due to wavefront shaping with local fluorescence increase up to 75%. The setup allows full independent control over spatial and spectral phases keeping or improving the spatial resolution of our microscope and provides the optimal tool for sensitive non-linear and coherent control microscopy.
关键词： two-photon microscopy,wavefront shaping,spatial light modulator,fluorescence signal enhancement,temporal pulse shaping
更新于2025-09-04 15:30:14