Technical Articles

Meadowlark Optics, Inc. has published these technical articles:

(Optical Components)
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An analog 128 X 128 spatial light modulator (SLM) has been designed and constructed using liquid crystal on-silicon technology....
(Optical Components)
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A 256 x 256 spatial light modulator (SLM) has been designed and constructed by the use of liquid crystal on-silicon technology....
(Optical Components)
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Holographic optical tweezers have found many applications including the construction of complex micron-scale 3D structures and the control of tools and probes for position, force, and viscosity...
(Optical Components)
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Spatial Light Modulators (SLMs) can emulate the classic microscopy techniques, including differential interference (DIC) contrast and (spiral) phase contrast....
(Optical Components)
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Beam splitting polarizer cubes consisting of two right angle prisms cemented together after one hypotenuse is coated have become important optical components in many optical systems. Usually the...
(Optical Components)
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Non-mechanical beamsteering eliminates the need for massive optomechanical components to steer the field of view of optical systems....
(Optical Components)
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New devices and approaches are being developed for controlling beam direction and shape using liquid crystal based assemblies. This paper discusses recent advancements in these areas including...
(Optical Components)
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Recent advances in our high-speed analog liquid crystal spatial light modulators (SLMs) will be presented. These advancements include higher pixel density, smaller pixel pitch, greatly improved...
(Optical Components)
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Commercially available Liquid Crystal on Silicon (LCoS) Optical Phase Arrays (OPA) are capable of non-mechanically beamsteering up to ±3 degrees at 1550 nm....
(Optical Components)
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Liquid crystal tunable filters are gaining wide acceptance in such diverse areas as optical fiber communications, astronomy, remote sensing, pollution monitoring, color generation for display and...
(Optical Components)
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The performance and operation of high-speed, liquid crystal spatial light modulators are discussed in relation to a variety of system-level aspects....
(Optical Components)
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This application note briefly describes polarized light, retardation and a few of the tools used to manipulate the polarization state of light. Also included are descriptions of basic component...
(Optical Components)
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Mobile free space optical (MFSO) networks introduce new challenges for laser communication terminals. Network capabilities, such as packet routing where different information packets are sent to...
(Optical Components)
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A solid-state broadband beam deflector is described. This non-mechanical system steers spatially coherent broad band light to a common location in the far field....
(Optical Components)
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We discuss a white-light processing system that produces a dynamic, achromatic Fourier transformation over the visible spectrum. The system includes an achromatic fourier transform lens system and a...
(Optical Components)
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Beam steering in two dimensions can be achieved using a reflection-mode liquid crystal optical phased array (OPA) with a backplane that has a two-dimensional pixel structure....
(Optical Components)
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We demonstrate pulse shaping via arbitrary phase modulation with a reflective, 1×4096 element, liquid crystal spatial light modulator (SLM)....
(Optical Components)
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Pulse shaping benefits a variety of Coherent Anti-Stokes Raman Scattering (CARS) illumination configurations by maximizing the resonant signal and/or minimizing the non-resonant signal....
(Optical Components)
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Reversible, controlled creation of patterns of topological defects in liquid crystals is achieved using focused beams with optical phase singularities....
(Optical Components)
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By superimposing a tunable binary phase grating with a conventional computer-generated hologram, the total power of multiple holographic 3D spots can be easily controlled by changing the phase depth...
(Optical Components)
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Optical CDMA technology has shown promise in optical communications, particularly in local-area optical fiber networks....
(Optical Components)
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Newer silicon foundry processes make possible high-resolution backplanes (i.e. larger arrays with more line pairs per millimeter). Higher resolution is a benefit of the small geometry processes being...
(Optoelectronics)
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The speed of most parallel-aligned liquid-crystal-on-silicon (LCoS) spatial light modulators (SLMs) is limited to the video rate of their drivers, which is a limitation for high-speed applications....
(Spectroscopy)
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JPL is developing an innovative compact, low mass, Electro-Optic Imaging Fourier Transform Spectrometer (E-O IFTS) for hyperspectral imaging applications....
(Spectroscopy)
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Error sources that afflict true zero order, compound zero order and multi-order linear retarders include variations in temperature, angle of incidence, wavelength, and the presence of multiple...
(Optical Components)
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We have developed a workstation based on holographic tweezers to optically trap, move and characterize metal nanoparticles. Our advanced darkfield imaging system allows us to simultaneously image and...
(Optical Components)
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There has been an immense drive in modern microscopy towards miniaturization and fibre-based technology....
(Optical Components)
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Cholesteric liquid crystals were the first liquid-crystalline phase observed....
(Optical Components)
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Improvements in silicon foundry processes have made possible high-resolution, light-efficient backplanes capable of driving electro-optic modulators with higher voltage signals....
(Optical Components)
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We report what is to our knowledge the first implementation of a broadband analog intensity modulator composed of two chiral smectic liquid-crystal half-wave retarders....
(Optical Components)
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Recent advancements in our high-speed multi-level (analog) 512x512 liquid crystal Spatial Light Modulator (SLM) will be presented. These advancements include smaller pixel pitch, greatly improved...
(Optical Components)
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Recent and near-term advancements in our multi-level (analog) phase/amplitude liquid crystal spatial light modulators will be presented....
(Optical Components)
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Spatiotemporal patterns of activity carried across large populations of neurons are the fundamental representation of information within the nervous system....
(Optical Components)
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We use a phase-only spatial light modulator to generate light distributions in which the intensity decays as a power law from a central maximum, with order ranging from 2 (parabolic) to 0.5....
(Optical Components)
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This paper presents an improved direct binary search (DBS)-based algorithm for generating holograms to holographic optical tweezers....
(Optical Components)
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High-resolution, liquid-crystal spatial light modulators (SLMs) are being used as dynamic phase screens for testing optical systems and as optical wavefront compensators to dynamically correct...
(Optical Components)
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Recent interest in liquid crystal spatial light modulators as a potential replacement to traditional optical beam steering methods have engendered experiments to determine the technology's resistant...
(Optical Components)
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We present a holographic optical tweezers system capable of position clamping multiple particles. Moving an optical trap in response to the trapped object's motion is a powerful technique for optical...
(Optical Components)
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The Fabry-Perot is an optically resonant cavity formed by two partially reflecting mirrors that ideally are nonabsorbing and therefore transmit the light that is not reflected. In the simplest case...
(Optical Components)
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While the liquid crystal industry is primarily driven by the display industry, increasingly important applications in science and engineering have emerged such as beam steering, wavefront modulation...
(Optical Components)
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In recent years, optical CDMA systems have been proposed for multiple accesses to utilize the vast bandwidth available in optical fiber....
(Optoelectronics)
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As the deployment of IR sensors increases in the military arena, so does the need for testing, calibration and training in realistic infrared environments....
(Optical Components)
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Several applications for solid-state, random aces beam directors have merged in recent years, including scanners, laser radar components, interconnects, elements for addressing holographic storage,...
(Optical Components)
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Beamsteering using liquid crystals can be achieved with refractive or diffractive implementations. The common thread in these various structures is that the liquid crystal is employed as an optical...
(Optical Components)
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The advantages of laser communications including high bandwidth, resistance to jamming and secure links have made it a key technology for current and future C4ISR capabilities. Laser Communications...
(Optical Components)
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We demonstrate a new method for creating synthetic tissue that has the potential to capture the three-dimensional (3D) complexity of a multi-cellular organism with submicron precision....
(Spectroscopy)
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This application demonstrates a technique by which a polarimeter is used to measure the retardance of a waveplate....
(Optical Components)
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We present a method for reducing intensity fluctuations that typically occur when a spatial light modulator is updated between consecutive computer generated holograms....
(Optical Components)
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Novel tunable polarization interference filters (PIF) employing active liquid crystal devices are presented, and the principles of operation are described....
(Optical Components)
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An aperture composed of multiple small apertures has several advantages over a large continuous aperture when practical issues are included in the analysis....
(Optical Components)
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Techniques for the targeted optical stimulation of neurons may offer new ways to tackle medical problems such as heart defects, epilepsy, Parkinson's, blindness and hearing loss....
(Optical Components)
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A new technology for performing high-precision Stokes polarimetry is presented. One traditional Stokes polarimetry configuration relies on mechanical devices such as rapidly rotating waveplates that...
(Optical Components)
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Designing effective crystal waveplates requires understanding the engineering tradeoffs....
(Optical Components)
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Pulse-shaping is playing a more extensive role in multi-photon microscopy....
(Optical Components)
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The use of a fast-response, transmissive, ferroelectric liquid-crystal device for real-time control of the polarization direction of a femtosecond laser beam, and the benefits on various aspects of...
(Optical Components)
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Holographic speckle is a major impediment for the emerging applications of multiphoton holographic projection in biomedical imaging, photo-stimulation and micromachining....
(Spectroscopy)
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This application note details factors that effect the response time for Nematic Liquid Crystal optics. The response time of a liquid-crystal variable retarder depends on several factors, including the...
(Optical Components)
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We investigate the possibility of using a real-axis spatial light modulator (SLM) to realize complex-amplitude modulation with full coverage over the unit circle....
(Spectroscopy)
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Since the human eye is insensitive to polarization, there is a large amount of information in many situations, which is not readily utilized. Measuring the polarization state of light is useful in...
(Optical Components)
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We present spatial light interference microscopy (SLIM) as a new optical microscopy technique, capable of measuring nanoscale structures and dynamics in live cells via interferometry....
(Optical Components)
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Holographic beam forming to generate and control multiple optical traps has proved successful using high-resolution spatial light modulators (SLMs). This type of beam control allows a multitude of...
(Optical Components)
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By spectral phase shaping of both the pump and probe pulses in coherent anti-Stokes Raman scattering (CARS) spectroscopy, we demonstrate the extraction of the frequencies of vibrational lines using an...
(Spectroscopy)
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This application note describes how two Liquid-Crystal Variable Retarders (LCVRs) can be used to build a Stokes Polarimeter to accurately characterize the polarization state of a beam of light....
(Optical Components)
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Polymer dispersed liquid crystals are generally described as a system with an isotropic liquid crystal (LC) droplet distribution in a polymer matrix....
(Optical Components)
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An important problem associated with multiple pixel liquid crystal (LC) modulators is the incidental diffraction due to amplitude and phase gratings formed by the improperly modulated regions between...
(Optical Components)
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We demonstrate an integrated holographic optical tweezers system with double-helix point spread function (DH-PSF) imaging for high precision three-dimensional multi-particle tracking....
(Optical Components)
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We demonstrate single-molecule fluorescence imaging beyond the optical diffraction limit in 3 dimensions with a wide-field microscope that exhibits a double-helix point spread function (DH-PSF)....
(Optical Components)
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Unique liquid crystal (LC) spatial light modulators (SLM) are being developed for foveated imaging systems that provide wide field-of-view (FOV) coverage (±60? in azimuth and elevation) without...
(Optical Components)
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Two-photon microscopy is often performed at slow frame rates due to the need to serially scan all points in a field of view with a single laser beam. To overcome this problem, we have developed two...
(Optical Components)
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An ultrafast pulse shaper, capable of both phase and amplitude shaping, is constructed using a single high-resolution liquid crystal phase mask....
(Optical Components)
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Stable optical trapping and manipulation of high-index particles in low-index host media is often impossible due to the dominance of scattering forces over gradient forces....
(Optical Components)
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This paper presents the optical design and experimental demonstration of a compact, foveated, wide field-of-view (FOV) imaging system using two lenses and a liquid crystal spatial light modulator...