Title :
Cross-polarization in quasi-optical receivers: ALMA band 4 and 10
Author :
Gonzalez, A. ; Uzawa, Y.
Author_Institution :
Nat. Astron. Obs. of Japan, Mitaka, Japan
Abstract :
A careful study about the influence of individual optical components on receiver cross-polarization has been performed. The basic mechanisms of generation of cross-polarization in ellipsoidal mirrors and dielectrics have been reviewed and characterized in terms of higher-order Gaussian beam modes. A simple model considering the phase differences of different Gaussian beam modes is proposed in order to calculate the final system cross-polarization pattern. This model has been successfully used to characterize the total cross-polarization in two cryogenically-cooled receivers for astronomy: ALMA band 4 and band 10.
Keywords :
Gaussian processes; cryogenics; dielectric materials; mirrors; optical elements; optical receivers; ALMA band 10; ALMA band 4; astronomy; cross-polarization; cryogenically-cooled receivers; dielectrics; ellipsoidal mirrors; higher-order Gaussian beam modes; optical components; quasi optical receivers; Analytical models; Approximation methods; Mirrors; Optical filters; Receivers;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2012 37th International Conference on
Conference_Location :
Wollongong, NSW
Print_ISBN :
978-1-4673-1598-2
Electronic_ISBN :
2162-2027
DOI :
10.1109/IRMMW-THz.2012.6379491
