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Hi,

I would like to run modulation ( which then I will apply to the real components) of the laser beam collimation. I need to pick up the appropriate lenses in order to get a collimated laser beam of 1.2 mm. I thought if I run the simulation first in the Zemax then it should be easier with the practical part. My laser beam parameters are 

I was hoping to create a telescope in SC mode. However, how to define the laser light source. Normally, I would use NA, but I read that this is lens parameters not laser. I don’t see a beam divergence angle in the laser info too.  Does anyone could advise me on how to approach this seems to look like an easy simulation.

Thank you,

Regards,

Marzanna

Hi @Marzanna 

I would check the definition of the beam diameter here, but if it is 2 times the waist (it is a radius in Zemax), then you can simply calculate the divergence with:
 


 

Thank you, Sandrine,

Could I use half of the divergent angle as an  Object Space NA in Aperture type (SC)?

Regards,

Marzanna

 

 

Thank you, Sandrine,

Could I use half of the divergent angle as an  Object Space NA in Aperture type (SC)?

Regards,

Marzanna

Please note that the divergence angle as indicated by Sandrine is already a half cone angle (see, e.g., Gaussian beam - Wikipedia). The NA (= sin(alpha)) also uses a half cone angle.

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