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Features of designing the laser beam axis parallel transfer optical devices


T. S. Piskunov – Bauman Moscow State Technical University. E-mail:
P. V. Chibisov – JSC «GSKB Almaz-Antey named after A.A. Raspletin», Moscow. E-mail:

There is major problem of the laser beam axis parallel transfer in modern opto-electronic systems (OES) to precision measuring the angular coordinates in order to create the auto-adjustment system. This OES must operate in harsh environment conditions, such as vibrations and high temperature fluctuations. The problem is solved with parallel transfer device (PTD). The PTD are being mounted on the exit pupil of the transmitting channel optical system of the laser location station. In this case elements of the PTD are being exposed to the high-energetic scanning laser beam. Therefore there are problems to protect these elements of PTD and to maintain the scanning laser beam structure, being screened with the protective mounts. It is clear that there is a task of developing the PTD layout without those problems. This layout may be achieved with using a pentaprisms. As one might know, a pentaprism changes the angle of the input beam vector by 90° by one axis and this system is invariant to the pentaprism position fluctuations due mechanical vibrations. Retroreflection of the input laser beam can be achieved with a pair of pentaprisms, but this system would not be invariant to vibrations. In order to measure two angular coordinates of the input laser beam, the system based on four pentaprisms must be used. PTD layout based on four pentaprisms allows us to measure angular coordinates of the input laser beam without any errors, caused by mechanical vibrations of the system. The main feature of this layout is a vast range of the parallel transfer distances, because the mass and dimensions of the pentaprisms are not dependent on the transfer distance. In order to provide the required measurement accuracy the receiving lens focal distance f’ and the light-detector type and size must be considered. The factors, considered in this paper, are the key to design the high quality PTD, which should provide an instrumental error in range of seconds of arc.

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