Abstract:
A channel detection system includes an interferometer coupled to a spectrum analyzer to differentiate additive spontaneous emission (ASE) noise from optical channels in a dense wave-division multiplex (DWDM) signal. It is assumed that channels, if present, are centered at frequencies corresponding to a standardized channel grid. The relative delay of the interferometer is chosen to be greater than the coherence time of the ASE noise but less than the coherence time of the channels with the interferometer's free spectral range set to an integer divisor of the channel-to-channel frequency spacing of the grid such that active channels experience a high degree of interference. The phase delay of the interferometer is then adjusted to maximize the interference at each grid-aligned frequency. The spectrum-analyzed outputs are compared (e.g., subtracted from one another and then thresholded) to determine the channels present in the DWDM signal.
Abstract:
An opening fabricating apparatus for creating an opening with desired dimensions at a mask tip of a near-field optical microscope, and a near-field optical microscope using the same are provided. The apparatus comprising: a light source 116; reflection means 140; light detection means 124; press means 128, 130 pressing a probe tip against said reflection means; storage means 142; calculation means 144 figuring out the quantity of light of the reflected light for the acquisition of said opening with desired dimensions from the calibration information stored in said storage means; and press control means 126 controlling pressing of said probe tip against said reflection means so as to allow the quantity of light of said reflected light to become equal to the quantity figured out by said calculation means. The probe opening fabricating apparatus is capable of readily fabricating an opening of desired dimensions with a high reproducibility.
Abstract:
An opening fabricating apparatus for creating an opening with desired dimensions at a mask tip of a near-field optical microscope, and a near-field optical microscope using the same are provided. The apparatus comprising: a light source 116; reflection means 140; light detection means 124; press means 128, 130 pressing a probe tip against said reflection means; storage means 142; calculation means 144 figuring out the quantity of light of the reflected light for the acquisition of said opening with desired dimensions from the calibration information stored in said storage means; and press control means 126 controlling pressing of said probe tip against said reflection means so as to allow the quantity of light of said reflected light to become equal to the quantity figured out by said calculation means. The probe opening fabricating apparatus is capable of readily fabricating an opening of desired dimensions with a high reproducibility.
Abstract:
The invention relates to a reflector for an electric lamp, and a reflector lamp having an improved fastening of the electric contacts. The reflector body consists of an electrically insulating plastic and, for the purpose of making electric contact with the lamp, has contact lugs that are fixed at least two different locations on the outer side of the reflector body with the aid of claws or barbs integrally formed on the contact lugs.
Abstract:
A flexible shaft driven to rotate is inserted through a transparent sheath having pliability. By a fiber inserted through the inside thereof, low-coherence light is guided and is made to exit to a living-body tissue side which is an observation target through a lens and a prism forming an exit and entrance portion at the tip portion. Subsequently, the light reflected on the living-body tissue side is guided in order to produce an image. In that case, a positioning member for keeping the exit and entrance portion and the living-body tissue at a proper distance is formed at the tip portion of the sheath or the tip portion of an endoscope through which an optical probe is inserted and, therefore, a stable tomogram image can be produced.
Abstract:
An improved method and apparatus for controlling a scanning laser are provided by the present invention. In accordance with a preferred embodiment, a single feedback sensor is placed along the scan path of a scanning laser such that it senses the laser twice during each scan. The time intervals between the sensor sensing the laser are measured and examined to determine the position and direction of the scanning laser. These time intervals may also be used to ensure that the scanning device is operating at its resonant frequency. In systems that require detecting the laser as it enters and leaves the imaging window, a reflective device is used to create a beam path from the edge of the imaging window back to the single feedback sensor such that the sensor detects the laser four times during each scan. In such an embodiment, the drive signal used to scan the laser along its scan path can be compared to the pulses received from the sensor to determine whether or not a detected time interval corresponds to a particular physical portion of the scan path.
Abstract:
There is provided a scanning optical system which includes a light source, a line-like image forming optical system, a polygonal mirror, and an imaging optical system. The line-like image forming optical system forms a line-like image extending in the main scanning direction in the vicinity of a reflective surface of the polygonal mirror, and if the number of reflective surfaces of the polygonal mirror is less than or equal to six and if nullmnull>1.85, the following condition (1) is satisfied: r
Abstract translation:提供了一种扫描光学系统,其包括光源,线状图像形成光学系统,多面镜和成像光学系统。 线状图像形成光学系统在多面镜的反射面附近形成沿主扫描方向延伸的线状图像,如果多面镜的反射面的数量小于或等于6 如果| m |> 1.85,满足以下条件(1):r <5cos(w / 2f)/ [2 | m | {1-cos(w / 2f)}](1) m表示成像光学系统在辅助扫描方向上的横向倍率,f表示成像光学系统在主扫描方向上的焦距,w表示扫描宽度的一半。
Abstract:
An optical film of an optical filter portion as a component of a gas discharge display device has an absorption region for selectively absorbing a light between 550 nm of wavelength and 620 nm of wavelength. A transmittance of an absorption peak within the absorption region is within a range of 20% to 60% of an average transmittance in a visible light region.
Abstract:
A laser machining apparatus machines a workpiece at uniform intensity by converting a CO2 laser beam to uniform intensity using an intensity-converting element and a phase-matching element. The optical transmission system is configured such that the starting point of the laser beam pointing vector and the exit face of the intensity-converting element are mutually conjugated with respect to the optical transmission system. This structure offers stable machining by ensuring that the laser beam always enters the intensity-converting element at its center, even if the pointing vector of the laser beam shifts.
Abstract:
High quality images are provided without the occurrence of image quality defects due to reciprocity law failures, even when scanning a multi-beam. When interlaced scanning is employed, it is possible to select combinations such that, taking any freely selected neighboring scanning lines, respective scan numbers of the neighboring scanning lines are always different. Thus, a duration of scanning spacing can be made to be at least the duration of a single main scan. As a result, image defects such as banding due to reciprocity law failures can be greatly alleviated, and images can be provided in which image defects are to unlikely to be noticed in practice.