In this work, we introduce the use of a cellophane film as a half wave reta
rder plate of wide spectrum. Using a commercial are lamp as a light source,
we have characterized a cellophane film as half wave plate retarder in the
spectral range from lambda= 400 to 700 nm. In addition, we made similar ch
aracterizations for several commercial laser emission lines. Although this
film behaves as other commercial half wave plate retarder devices, it has t
he advantages of a lour cost and an easy availability. (C) 2001 Elsevier Sc
ience B.V. All rights reserved.