strehl - computer some parameter (include Strehl ratio) of the field

Calling Sequence

[out[,field_out]]=strehl(field_in)

Parameters

• field_in :input field. it must be diffractive wavefront.
• out : the output parameters of the input field .
• field_out : the output field or diffractive wavefront.

Description

the strehl ratio is calulate by below expression:

besides Strehl(the first value of out), other five parameters of the field are computed. they are: the total energy; the center of gravity in x and y direction; Standard deviation in x, y,and r direction.

Examples

	f0=begin(0.01,1e-6);
	f1=circ_ap(f0,0.005);
	f2=forvard(f1,1);
	
	[str,f3]=strehl(f2);
	field_plot(f3);	
	str(1)
 

Author

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

See Also

begin ,