Optical filtering device and application to a liquid crystal projector

摘要

PCT No. PCT/FR94/00733 Sec. 371 Date Feb. 16, 1996 Sec. 102(e) Date Feb. 16, 1996 PCT Filed Jun. 17, 1994 PCT Pub. No. WO95/35486 PCT Pub. Date Dec. 28, 1995This optical filtering device includes a dichroic separator on the path of a light beam to be processed. According to the invention, it also includes a holographic filtering device situated in series with the separator on the path of the same beam. The holographic device can be oriented so as to adjust the angle of incidence of the beam and hence adjust its range of filtering wavelengths.