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LO Beam Array Generation at 480 GHz by Use of Phase Gratings

Authors:
T. Klein, G.A Ediss, R. Güsten, H. Hauschildt, C. Kasemann
Abstract:
For the MPIfR's 480 GHz-heterodyne-array, 16 SIS mixer elements have to be driven by the local oscillator power of two LO-chains. In order to split the power of each LO into one subarray of 8 mixer elements in a conventional way a complicated beam splitting foil complex is necessary. A more elegant way to couple the LO-power is to generate the required beam array with a phase grating. Such devices have been developed at optical wavelengths and are potentially suitable for quasi optical applications. We will report upon the design of such gratings for quasi optical systems. Theoretical considerations and first measurements of binary phase gratings at 480GHz for a 3×3 beam array will be presented, as well as calculations of more efficient multilevel gratings. The design of the grating for the array receiver will be discussed.
Categories:
Optics
Year:
1997
Session:
9
Full-text:
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Page Number(s):
482-489