Low-loss tunable filter based on optical rotatory dispersion.
The optical arrangement of a spectral filter without an intermediate polarizer that was developed based on optical rotatory dispersion and test measurement results are presented and described. The filter uses three dispersive polarization rotators as the key elements in combination with two additional quarter-wave retarders, and it is wavelength tunable with a spectral transmission equivalent to that of a standard Lyot two-stage filter.
Ye
Chun
C
Measurement and Sensor Laboratory, University of Oulu, Technology Park 127, Fin-87400 Kajaani, Finland. chun.ye@oulu.fi