Abstract: A process for producing an optical element, which may be suitable for use in an infrared camera with sharp surface features and low emissivity surfaces, including the steps of casting the element in the desired shape in a zinc alloy, deburring the zinc alloy element with a thermal deburring operation, and coating the deburred zinc alloy element with an electrocoating operation.

Abstract: A HMD includes an electronic display and a pancake lens block. The pancake lens block includes a back curved optical element and a front curved optical element. Light propagating through the pancake lens block undergoes multiple reflections and to mitigate parasitic reflections, there are no air gaps between optical elements of the pancake lens block. A hybrid film that operates as a waveplate surface and a mirrored surface can be placed between the front curved optical element and the back curved optical element. A wide FOV can be obtained by making the coupling surfaces of the front optical element and the back optical element to be based on a convex cylindrical surface profile and a concave cylindrical surface profile, with the axis of the cylinder surface in a vertical direction for a user wearing the HMD.

Abstract: A high resolution laser scanning microscope has beam shaping elements configured to shape a beam of fluorescence inhibiting light which is directed into a back aperture of an objective connected to form an intensity minimum delimited by intensity maxima of the fluorescence inhibiting light in a focus of the objective. A plurality of optical elements including the objective and the beam shaping elements are arranged in a beam path of the beam to the focus. Using the microscope includes removing or exchanging or altering or adding at least one of the optical elements arranged in the beam path of the beam of fluorescence inhibiting light, and compensating a variation of polarization varying properties of the plurality of the optical elements, that is caused by removing or exchanging or altering or adding the at least one optical element, by adapting the beam shaping elements to the variation.

Abstract: Apparatus and methods to provide a surface having a tunable emissivity are disclosed. An example method includes tuning a characteristic of one or more resonators in a material to change an absorption of radiation by the one or more resonators and to change an amount of destructive interference caused by the material.

Abstract: Techniques, systems, devices and materials are disclosed for spectrally selective coatings for optical surfaces having high solar absorptivity, low infrared emissivity, and strong durability at elevated temperatures. In one aspect, a spectrally selective coating includes a substrate formed of a light absorbing material, and a composite material formed over the substrate and including nanoparticles dispersed in a dielectric material, in which the composite material forms a coating capable of absorbing solar energy in a selected spectrum and reflecting the solar energy in another selected spectrum.

Abstract: Provided are: an optical film, wherein interference fringes can be suppressed from being generated, cloudiness is not observed, and a manufacture cost can be reduced. In accordance with one aspect of the present invention, there is provided an optical film 10 including a functional layer 12, wherein the functional layer 12 has a concavo-convex surface 12A; and in a state in which the concavo-convex surface 12A is irradiated with parallel light travelling in a direction sloped at 10° with respect to a normal direction N of the optical film 10, in an angle distribution of reflected light intensities measured in a plane including both directions of the normal direction N and the travelling direction T of the parallel light, a value obtained by subtracting ½ angle width from 1/100 angle width is 0.7° or more and 1.4° or less.

Abstract: A light control film includes two transparent electroconductive resin substrates each having a transparent electroconductive film and a transparent resin substrate and a light control layer sandwiched between the transparent electroconductive film sides of the two transparent electroconductive resin substrates. The transparent electroconductive film of one transparent electroconductive resin substrate having a primer layer is cut through a cutting line to have a shape of a picture or character, and the cutting line is in a form that a start point for the cutting and an end point for the cutting make a closed region. The closed region of the picture of character is electrically insulated from the transparent electroconductive film around the shape of the picture or character. The light control film enables to improve adhesiveness between film matrix and substrates and to provide stable control function.

Abstract: A SPIM-microscope (Selective Plane Imaging Microscopy) having a y-direction illumination light source and a z-direction detection light camera. An x-scanner generates a sequential light sheet by scanning the illumination light beam in the x-direction. By an illumination optics having a zoom optics that is provided in the beam path of the illumination light beam the focal length of the illumination light beam can be varied.

Abstract: A laser scanning microscope (SR-LSM) and a method for correcting imaging errors in a laser scanning microscope. The SR-LSM includes an illumination device for providing an illumination spot; a scanner for moving the illumination spot to consecutive scanning positions over a sample to be examined; an adaptive optics unit for controlling a wavefront of the illumination spot with a control device and a detector for determining a spatially resolved imaging spot emitted by the sample. An evaluation unit is provided for determining a point-spread function (PSF) of the imaging spot at each scanning position, whereby a wavefront correction signal determined from the point-spread function (PSF) of a scanning position is supplied to the control device of the adaptive optics unit or is used in digital post-processing of the microscope image (e.g. by means of deconvolution).

Abstract: Ambient light can cause a user to experience a loss of contrast of an object or subject under observation by the user via a microscope, particularly when the user is observing the object or subject using fluorescence microscopy. An embodiment of the present invention is an ambient light restrictor for a microscope. The ambient light restrictor defines a port to provide a user with access to oculars of the microscope. The restrictor may be freestanding and provide additional port(s) to enable physical access to the microscope or viewing region. Through use of the restrictor, ambient lights need not be turned off, in cases of indoor use, such as when dozens of microscopes are being used by many scientists in a laboratory, and, in cases of outdoor use, microscopes can be used with little to no loss of contrast of objects or subjects under observation.

Abstract: The tri-axis close-loop feedback controlling module for electromagnetic lens driving device includes a 6-pin Hall element. Two pins of the Hall element are coupled to an auto-focus module for providing a current to drive the auto-focus module to conduct auto-focusing operations along the Z-axis; while other four pins of the Hall element are coupled to a control unit. The control unit detects the X-Y axial positions of the auto-focus module relative to an OIS module and generates a control signal which is then sent to the Hall element. Therefore, the Hall element not only can provide its own feedback controlling function according to the Z-axial position of lens, but also can drive the auto-focus module based on the control signal corresponding to the X-Y axial positions of the auto-focus module, so as to achieve the goal of tri-axis close-loop feedback controlling for the electromagnetic lens driving device.

Abstract: A wire grid polarizer comprising on array of parallel, elongated first rib groups disposed over a substrate. Each first rib group can comprise a central first transmissive rib and a pair of first wires including a first wire disposed along each side of the first transmissive rib. A first dielectric material can substantially fill first gaps between each rib group and an adjacent rib group. An array of parallel, elongated second wires can be disposed over the rib groups and the first dielectric material. The first wires or the second wires can be absorptive and the other of the first wires or the second wires can be reflective.

Abstract: A sample retaining member insertion-removal mechanism is configured so that a receiver is driven to an advance position by a receiver driving unit to project out through an opening of a stage so that a receiving surface makes a downward slope toward a receiving surface positioning portion. Because of this, the sample retaining member insertion-removal mechanism can position the sample retaining member by the receiving surface positioning portion through the use of the downward slope of the receiving surface by simply placing the sample retaining member on the receiving surface. After the positioning by the receiving surface positioning portion, the receiver is driven to a retraction position by the receiver driving unit, whereby the sample retaining member is transferred from the receiver to the stage.

Abstract: Interpupillary distance of binoculars is adjusted by relatively rotating a pair of lens barrels about a predetermined axis. A click position setting mechanism sets a click position at an arbitrary angle of rotation of said pair of lens barrels and includes a rotating member rotatable about the predetermined axis. A lock/unlock member locks and unlocks the rotation of the rotating member.

Abstract: A five-mirror all-reflective afocal anastigmat. In one example, a five mirror afocal anastigmat includes five mirrors arranged to sequentially reflect from one another electromagnetic radiation received via a system entrance pupil to produce a collimated output beam of the electromagnetic radiation at a system exit pupil, the five mirrors consisting of three positive-powered mirrors and two negative-powered mirrors, wherein optical powers of the five mirrors are balanced to achieve a flat field condition at the system exit pupil.

Abstract: In an inner layer measurement method, first irradiation light and second irradiation light having a peak wavelength longer than that of the first irradiation light are formed by changing at least one of a position where light emitted from a lamp is transmitted through a short pass filter and a position where light emitted from a lamp is transmitted through a long pass filter. Then, a first XY sectional surface of a semitransparent body is measured by irradiating the first XY sectional surface with the first irradiation light. A second XY sectional surface positioned on a layer deeper than the first XY sectional surface is measured by irradiating the second XY sectional surface with the second irradiation light. Each of the short pass filter and the long pass filter can transmit the light and has properties of changing a cutoff wavelength according to the position where the light is transmitted.

Abstract: The imaging optical system makes magnification conjugate side and reduction conjugate side predetermined positions conjugate to each other and forms an intermediate image conjugate to both the predetermined positions. The optical system includes a magnification side positive lens as a first lens disposed on the magnification conjugate side further than an intermediate imaging position, a reduction side positive lens as a third lens disposed on the reduction conjugate side further than the intermediate imaging position, and a negative lens as a second lens disposed between these positive lenses. Conditions of 5<?2??1<80, 5<?2??3<80, 0.03<N1?N2<1.0 and 0.03<N3?N2<1.0 are satisfied where ?1, ?2 and ?3 represent Abbe numbers of materials of the first, second and third lenses, N1, N2 and N3 represent refractive indices of the materials of the first, second and third lenses.

Abstract: An optical system a plurality of lenses, arranged within a same optical path, configured to simultaneously pass and focus therethrough short-wave infrared (SWIR) and mid-wave infrared (MWIR) spectral bands to a common focal plane and provide simultaneous correction of monochromatic and chromatic aberrations over the SWIR and MWIR spectral bands is disclosed. Another system and a method are also disclosed.

Abstract: A method for forming an optical window. In one example, the method includes depositing a layer of eutectic bonding material onto a first surface of a first section of window material, positioning a second surface of a second section of window material onto the layer of eutectic bonding material such that the first surface is disposed opposite the second surface, and heating the eutectic bonding material to a temperature above a eutectic temperature of the eutectic bonding material and below a melting temperature of the window material for a predetermined length of time to form an optical window. The window material of the first section and the second section may be transparent to infrared radiation and comprise aluminum.

Abstract: To reduce an influence of stray light and stably record/reproduce high-quality data in holographic recording/reproduction. A holographic memory device includes an optical system that guides a reference beam to an optical information recording medium at a desired angle of incidence, a control part that controls the angle of incidence of the reference beam generated in the optical system, and a lens part that images the reference beam in a desired position of the optical information recording medium. Further, at least a first light beam at a first angle and a second light beam at a second angle different from the first angle are output from the optical element, and the optical element is provided so that the first light beam may propagate within an effective diameter of the lens part and the second light beam may propagate to an outside of the effective diameter of the lens part.