Stabilization of a channeled spectropolarimeter by self-calibration.
A novel method to stabilize a channeled spectropolarimeter is described. The fluctuating retardations of the high-order retarders used in the spectropolarimeter are calibrated in parallel to the measurement of the wavenumber-dependent state of polarization (SOP) of light. Both the calibration of the retarders and the measurement of the SOP can be made simultaneously using a single light to be measured, and hence the resultant wavenumber-dependent SOP is almost immune to fluctuation of the retardations. The effectiveness of this method is experimentally demonstrated with retardation fluctuations induced by a temperature change up to 40 degrees C.
Taniguchi
Atsushi
A
Division of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan.
Oka
Kazuhiko
K
Okabe
Hiroshi
H
Hayakawa
Masayuki
M