Abstract:
Optical performance monitoring device for monitoring and analyzing an optical signal has a periodically movable reflective mirror to receive an input optical beam and to cyclically nullscannull (deflect) the beam in a one-dimensional direction. The deflected beam at a varying deflection angle is directed to a linear variable filter (LVF) that passes a selected wavelength channel of the deflected beam in dependence upon the deflection angle. The selected channel is then passed to a photodetector via a focusing lens, typically a cylindrical lens. The device is durable, tunable, offers low loss, good wavelength registrability and spectral resolution.
Abstract:
A field emission electron source includes: a field emission array portion composed of an insulation layer with a plurality of apertures, which is formed on a substrate, an extraction electrode formed on the insulation layer, and a plurality of cathodes formed respectively on the substrate in the plurality of apertures; a cathode base for fixing the field emission array portion; and an electron lens portion composed of a plurality of electrode members having a function of accelerating and converging an electron beam emitted from the field emission array portion. An emission axis of the electron beam emitted from the field emission array portion has a predetermined angle with respect to an optical axis of the electron lens portion. Thus, the field emission array portion can be protected from impact caused by ions generated in the electron lens portion, thereby improving the life of a field emission electron source.
Abstract:
A scanning device for measuring the distance between the scanning device and a plurality of surface points on a target object. The scanning device sweeps a laser beam and a line scan camera in synchronization up and down the surface of the target object. The line scan camera monitors the impact point of the laser beam upon the target object within its field of view. By knowing the position of the impact point within the camera's field of view, trigonometric principles can be applied to accurately calculate the distance to the impact point.
Abstract:
A scanning microscope for examination of a sample (31), having at least one optical component (89) that exhibits a wavelength-dependent characteristic and having an apparatus for wavelength-dependent detection that acquires measured values in at least two wavelength regions each characterized by a spectral width and a spectral position, is disclosed. The scanning microscope is characterized in that the wavelength-dependent characteristic of the at least one optical component (89) can be ascertained, can be at least temporarily stored in the form of a data set in a memory (49, 81), and can be considered upon acquisition and/or upon utilization of the measured values.
Abstract:
A high sensitivity beam deflection sensing optical device, such as an atomic force microscope, including one or more of the following: specified means in the path of the incident beam for adjusting the size and/or power of the incident beam spot, means for moving the incident beam spot with movement of the object whereby to maintain the position of the spot on the object, and means for increasing the signal to noise ratio of the optical detector in which adjusted gains are applied to different segments of the optical detector.
Abstract:
In one illustrative embodiment, a method is provided that comprises energizing a light source to provide light having a preselected intensity. A first photosensor, which is capable of delivering a first signal indicative of the intensity of the light source, is exposed to the light source. A second photosensor, which is also capable of delivering a second signal indicative of the intensity of the light source, is also exposed to the light source. Thereafter, the first and second signals are compared, and an error signal is delivered in response to detecting a significant difference between the first and second signals.
Abstract:
A head light includes a curve refection base and a filament is connected to a close end of the reflection base, and a transparent casing is connected to an open end of the reflection base. A light beam guiding device is connected to an inside of the casing and includes a plurality of plates. Each plate has an absorbing layer coated on an upper surface thereof, and a reflection layer coated on a bottom surface of each of the plates. The light beam is not reflected upward and is reflected downward.
Abstract:
A method and an apparatus for point-by-point scanning of a specimen (15) are disclosed. The method is characterized by the steps of generation (45) of a nominal signal (10) for each scan point and transfer (47) of the nominal signal to a scanning device (7). In further steps, determination (49) of an actual signal (25) for each scan point from the setting of the scanning device (7), detection (51) of at least one detection signal (21) for each scan point, calculation (53) of a display signal (27) and an image point position (29) from the actual signal (25) and/or the nominal signal (10) and the detection signal (21), and assignment (55) of the display signal (27) to the image point position (29), are performed.
Abstract:
The invention relates to structure and arrangement for causing incident light polarization to enter a minute aperture while controlling or preserving the incident light polarization. They are characterized in that one location of the contour of the minute aperture is substantially perpendicular to the direction of polarization of incident light. It can realize near-field optical-generating element, near-field optical recording device, and near-field optical microscope of the minute aperture type capable of improving both the intensity of near-field light and the resolution.
Abstract:
An apparatus for selecting and detecting at least one spectral region of a spectrally spread light beam, preferably in the beam path of a confocal scanning microscope, the spread light beam being focussable in a focal line, is characterized, for non-overlapping detection of the spectrally spread light beam of the selected spectral regions in the context of an increased number of detectors and an error-tolerant arrangement, in that there is arranged in the spread light beam an optical component which reflects and/or refracts the light beam to a detector and whose optically effective region becomes smaller or larger along the surface, so that by orientation of the component with respect to the focal line and the resulting superposition of the focal line and surface, the spectral region arriving at the detector is definable.