Owen Gallagher
oweng@oweng.com
Wednesday, 06 February, 1998


Application  Note for VOB Pro         Optimization of HOE Germanium lens system

Optimization of lens systems is a bit of a complicated process. There are many 
settings in the functions and parameters files in VOB Pro that control the 
optimization process. The details of the functioning are best learned by following 
examples.

In this example VOB Pro optimizes all radii of a Holographic Optical Element Germanium 
lens system. The initial lens system is the HOE11.os from the VOB Pro example set. 
It is here as the HOE11.os file.  The parameter and functions file and the version of this to 
be optimized are HOE11.xxx files. The lens system after optimization is 
HOE11Opt.os. 

There are before and after .bmp screen shots of Vob Pro and HOE11.os. These include Spot, 
Aberrationd, and PSF for both beams.

The optimization process can be followed during the run by opening spot and 
aberrations sub windows prior to starting the optimization run. 

This optimization goes for about 16 iterations and then stops with a constraints 
violation. At this point the optimization process is making minimal changes per 
iteration. This is the criteria for halting calculation.
