Comment on "Tunable three-dimensional intensity distribution by a pure phase-shifting apodizer".
In the past few years, many radially symmetric pupil masks have been designed for the control of the light intensity distribution near the geometrical focus of optical systems. A recent paper by Gao et al. [Appl. Opt. 44, 4870 (2005)] analyzed the performance of binary 0-pi phase-only masks for an incident beam with Gaussian amplitude. Some inaccuracies of the analysis concerning the evolution of the Strehl ratio with the mask parameters are corrected.
Canales
Vidal F
VF
Departamento de Física Aplicada, Universidad de Cantabria, Santander, Spain. fernancv@unican.es
Oti
José E
JE
Cagigal
Manuel P
MP