Many applications of diffractive phase elements involve the calculation of a continuous phase profile that is subsequently quantized for fabrication. The quantization process maps the continuous range of phase values to a limited number of discrete steps. We report our observation of the influence of this quantization process on the performance of mode-selecting diffractive elements and show that the quantization process produces significantly better results by use of an optimized bias phase. In principle this process can be employed to a greater or lesser extent in any quantization process.
© 1999 Optical Society of America
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.1970) Diffraction and gratings : Diffractive optics
(140.3300) Lasers and laser optics : Laser beam shaping
(140.4780) Lasers and laser optics : Optical resonators
(230.1950) Optical devices : Diffraction gratings
Karsten Ballüder and Mohammad R. Taghizadeh, "Optimized phase quantization for diffractive elements by use of a bias phase," Opt. Lett. 24, 1756-1758 (1999)