ZEMAX

[corne...@gmail.com]

I have ZEMAX-SE and am trying to design a collimator for a laser
diode. Is it possible to set up a source in ZEMAX-SE (I know you can
in EE) that has divergence of different angles in the different
planes?

Thanks
Tim

[philip.m...@gmail.com]

Tim,

What I do in ZEMAX is use two orthogonal paraxial cylindrical lenses
and the RAID command in the merit function to set the orthogonal
divergences. I also set the apodization to Gaussian with a .6 to .85
to match the beam profile of a diode.

There are many commercial solutions for diode collimation, almost
every diode laser manufacturer sells a collimated model, or
collimation kit including the big catalogs. You may not need to
design a collimating asphere.

-Philip

[corne...@gmail.com]

Another question, how to I change the rotation of a cylindrical lens?
ZEMAX just puts it in a certain way and I can't seem to get it to
rotate.

Thanks for the help,
Tim

On Feb 25, 10:36 am, "philip.mccull...@gmail.com"

[philip.m...@gmail.com]

the paraxial lenses are defaulted to align with either the x or y
axes, for arbitrary rotation use the tilt/decenter element tool.
Zemax knowledge base has an article on how to tilt/rotate/decenter
elements.

http://www.zemax.com/kb/articles/24/1/How-to-Tilt-and-Decenter-a-Sequential-Optical-Component/Page1.html

[corne...@gmail.com]

First, let me thank you for all your help.

Would it be possible to get an example of what you fill into the merit
function editor? I haven't been able to replicate what you
suggested. I am trying to get a divergence of 9 degrees in one
direction and 19 degrees in the other.

Thanks
Tim

On Feb 25, 11:56 am, "philip.mccull...@gmail.com"

> http://www.zemax.com/kb/articles/24/1/How-to-Tilt-and-Decenter-a-Sequ...- Hide quoted text -
>
> - Show quoted text -

[Alexander Dräbenstedt]

Hi,

I can imagine it the following way:
take a source at infinity, entrance pupil diam. for instance 5mm.
surface 1: ParaxialXY, Y-Power=0.0625 (f=16mm) Thickness=(16-7.3)=8.7mm
surface 2: ParaxialXY, X-Power=0.137 (f=7.3mm) Thick=7.3mm
surface 3: now image, but later your effective source

use two RAID operands in merit function with Hx=0,Hy=0,Px=1,Py=0 and
Hx=0,Hy=0,Px=0,Py=1, to get the marginal ray angles for x and y at surf 3
and use these to optimize the focal length's and thicknesses of the two
ParaxialXYs to create the wanted angles in surf3.
Spice with gaussian apodization, fix all variables and continue your system
at surf4.

Btw, the analysis functions "paraxial gaussian beam", "skew gauss. beam"...
offer seperate source settings for x and y independent of the beam
definition in "General/Aperture".

Alexander

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