Point spread function in a confocal microscope with trigonometric pupil filters

In this paper the distribution of point spread function was examined versus the spatial frequencies of the filters of cos(N rho) type modulating the a perture of the confocal CSM for different values of numerical aperture. In particular, the following relations were determined: i) PSF as dependent on the pupil modulating spatial frequency r for N = 1, 2, 3, 4 5, 6, 7, 9, 11 and numerical aperture NA = 0.8; ii) PSF for filters of cos(4 rho), cos(10 rho) type and NA = 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4; iii) cut-off spatial frequences r(e) for the aperture modulated by cos(N rho) for N = 0 ..., 20 , NA = 0.2, 0.5, 1.0 and lambda = 0.6328 mum.