Abstract: The technology disclosed relates to improved acousto-optic deflectors (AODs). In particular, it relates to compensation for subtle effects not previously addressed by AOD designers. A shifting center of gravity is described and addressed using advanced power equalization strategies. Denser writing brushes are provided by using a two-dimensional array of beams with corrections for factors such as angle of incidence at the AOD interface.

Abstract: The technology disclosed relates to improved acousto-optic deflectors (AODs). In particular, it relates to compensation for subtle effects not previously addressed by AOD designers. A shifting center of gravity is described and addressed using advanced power equalisation strategies. Denser writing brushes are provided by using a two-dimensional array of beams with corrections for factors such as angle of incidence at the AOD interface. The compensation and dense brush features can be used separately or in combination.

Abstract: The technology described applies an extended frequency range of over one octave to drive an acousto-optic deflector, thereby defying a design rule of thumb that limited bandwidth to just under one octave. A combination of extended frequency range and well-timed beam blanking reduces the proportion of a so-called chirp signal that is consumed by beam blanking. This increases the working, effective portion of the sweep signal.

Abstract: The present invention relates to a reconfigurable micro-mechanical light modulator including a two-dimensional array of modulating elements with redundant rows of modulating elements. In particular, it relates to extending the life of the modulator by shifting the set of elements used, without physically replacing the micro-mechanical light modulator. The modulating elements are adapted to modulate light impinging on the micro-mechanical light modulator. The array of modulating elements comprises a first and a second set of modulating elements. The second set is a redundant set of modulating elements that can be selected to substitute for the first set of modulating elements in modulating light impinging on the micro-mechanical light modulator, without physically replacing the micro-mechanical light modulator. Devices and methods are described.

Abstract: A communication link for transferring information from a data terminal with connected light pen (3), which includes a light diode (4) and a phototransistor (5) or corresponding means, to a greater computer unit.According to the invention, the communication link (1) includes an information transferring device, which according to a first embodiment comprises a phototransistor (11). The light pen (3) is arranged so as by means of its light diode (4) to emit light corresponding to information stored in the data terminal (10), which information is converted via the phototransistor (11) to electric signals and transferred to the greater computer unit.According to a second embodiment, the information transferring device also includes a light diode (16), which is arranged so as to emit light pulses corresponding to instructions to the data terminal (10) arriving from a greater computer unit.

Abstract: A compensating device in combination with a laser interferometer, which laser interferometer comprises a laser (1), a prism (6) rigidly connected to a movable object, a beam splitter prism (2) and a stationary prism (3). The wavelength of the laser light is subject to changes by external factors, for example meteorologic ones. The compensating device includes mechanism (4,5) capable to change the position of the stationary prism (3) in response to and by means of an electric signal, which represents the desired compensation for magnitudes affecting the accuracy of the laser interferometer.