Question

Homogeneous Laser Line Validation

  • 7 November 2023
  • 2 replies
  • 112 views
SiHan

Hi,

by following this article Top Hat and changing the lens surface to toroidal I optimized a homogeneous laser line along y-axis in sequential mode. At least I believe so, since the spacings between the rays (layout_detailed) are homogeneous.

While for the circular top hat profile described in the article Geometrical Image Analysis is a great tool to intuitively check the intensity profile, for me it doesn´t seems to work for the laser line. (beam_profile).

Is there a way to analyse the the intensity profile for the laser line in a similar way?

I do not really understand why the Geometrical Image Analysis do not work for the laser line. Probably because we still have a gaussian profile along the x-axis?

layout
layout_detailed
beam_profile

 

2 replies

Kevin Scales
Rank
Userlevel 4
Badge +1

This question comes up from time to time. There are two issues to get past if you want to perform this analysis for a different system. One is that the Gaussian to top-hat analysis has to be done for different beam shapes. The other is that the analysis in the KBA article makes use of the radial symmetry of the system, so everything can be done with only radial sample rays. Using a line would require a fully 2-D analysis and subsequent optimization.

We don’t have any further examples like this, but certainly encourage any users who work one out to share with the larger community.

Kevin Scales
SiHan

Thanks a lot for your reply Kevin.

For me it is not clear in which way the KBA article makes use of the radial symmetry in a way we can not use it for optimizing a line.

Let me try to explain my point of view. In the KBA article a “rotational symmetric” Gaussian beam is formed into a rotational symmetric top-hat. For analysis they use the Geometric Image Analysis (Cross X setting - or Cross Y, which leads to a identical result) where in case of a good optimization a rectangular profile is plotted. Now we can make the assumption, that only rays exactly in the Y-Z plane of the entrance pupil have an effect on the GIA Cross Y plot, since any other rays are refracted away from the Y-Z plane. According this assumption for the analysis it doesn´t makes a difference anymore whether a cylindrical or a rotation symmetric lens is uses, since the lens curvature in the Y-Z plane is the same for both.

 

 

Reply


Community Posting GuidelinesCookie settings


Zemax Community

Need more help?

To Chinese users:

Do not provide any information or data that is restricted by applicable law, including by the People’s Republic of China’s Cybersecurity and Data Security Laws ( e.g., Important Data, National Core Data, etc.).


不要提供任何受适用法律，包括中华人民共和国的网络安全和数据安全法限制的信息或数据（如重要数据、国家核心数据等）。



Privacy policy   License Agreements    Terms of use    Cookie Policy   Zemax Account Licensing Policies