rect_ap - filters the field through rectangle aperture.

Calling Sequence

[field_out]=rect_ap(field_in,sx[,sy[,x_shift[,y_shift[,angle]]]])

Parameters

• field_in :input field. it must be diffractive wavefront.
• sx : the size X direction of the aperture in meters.
• sy : the size Y direction of the aperture in meters.( default is sx)
• x_shift : the shifts of the X direction in meters. ( default is 0.)
• y_shift : the shifts of the Y direction in meters. ( default is 0.)
• angle :the initial angle of the aperture in radian.( default is 0.)
• field_out : the output field or diffractive wavefront.

Description

rect_ap filters the field (first argument) through a square or rectangular aperture. The argument sx defines the side length of the (square) aperture, the sy is the length of the second side of a rectangle, x_shift and y_shift are shifts in x and y directions and the last argument is the rotation of the aperture. Only the first argument is obligatory (centered square aperture).

Examples

	F1=begin(0.01,1e-6);
	F2=rect_ap(F1,0.004,0.004,-0.0015,-0.002);
	field_plot(F2);
	dwf_fits(F2,"F2");	
 

Author

Chen jingyuan, Gan guangyong (IAPCM, Beijing,China.)

See Also

rectang ,   rect_screen ,   gauss ,   hex_ap ,   rect_ap ,   annul_ap ,   aperture ,