Graded-reflectivity mirror based on a volume phase hologram in a photopolymer film

Graded-reflectivity mirrors for 1064-nm wavelength have been fabricated by use of volume phase holograms recorded in photopolymer films. A method for producing such holograms for the 1064-nm radiation by use of a 532-nm light source with a short (0.1-mm) coherence length was developed. The measured peak reflectivity of the mirror reached 95%, and its super-Gaussian profile well matched that calculated based on coupled-mode theory. The mirror can withstand a peak power density greater than 10(8) W/cm(2). This method can also be used for fabricating deflectors that direct an incident beam to any specified angle other than the angle of reflection.