Collimation of a Gaussian beam

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SUMMARY

This discussion focuses on designing optics in Zemax for the collimation of a Gaussian beam, specifically for off-axis rays. The user aims to achieve a collimated beam with minimal divergence over a distance of at least 500 mm after a lens. The beam splitter in use is a Diffractive Optical Element (DOE) that splits the incoming laser beam into two beams of equal intensity at a 5-degree angle to the normal surface. Key parameters include a wavelength of 1064 nm and a beam waist radius of 1 mm, with a Rayleigh range of approximately 3 m.

PREREQUISITES
  • Familiarity with Zemax optical design software
  • Understanding of Gaussian beam properties and characteristics
  • Knowledge of Diffractive Optical Elements (DOEs)
  • Basic principles of laser optics and collimation techniques
NEXT STEPS
  • Research Zemax optimization techniques for Gaussian beam collimation
  • Study the design and application of Diffractive Optical Elements (DOEs)
  • Explore methods to minimize beam divergence in laser optics
  • Learn about the Rayleigh range and its implications in optical design
USEFUL FOR

Optical engineers, laser physicists, and anyone involved in the design and optimization of optical systems using Zemax for Gaussian beam applications.

Mubeen
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Hi, i would like to design a optics in zemax for collimation of guassian beam. The collimation is to be done for the beam for off axis rays. Attached the foto of what i would like to achieve.
 

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Hello and :welcome:

Mubeen said:
what i would like to achieve.
Not clear to me how you specify the incoming beam. A laser beam ? 'Gaussian' ?

What do you mean with 'beamsplitter'? It it splitting the beam in two beams ?

##\ ##
 
hey. The incoming beam is a laser beam having guassian intensity distribution. Thats why i have mentioned guassian beam, sorry for the confusion. Beam splitter will split the beam in to two beams of equal intensities.
 
Last edited by a moderator:
No need to apologize.
I only know cube and plate type beamsplitters, so I wonder how this one works

1709057646098.png

On a screen to the right, would you get two Gaussian dots ? Or an evenly illuminated disk ?

PS the guy's name is Gauss, not Gauss :smile:

##\ ##
 
i want the beam to be have the collimated (Parallel as well as without divergence) for atleast 500 mm after the lens. i have tried the setup in zemax but the beam after certain distance is getting focused and then getting diverged as expected for gaussian beam. on the detector will get a two beam spots whose spot size should be almost same as the incoming beam to beam splitter.
 
Welcome to PF.

Mubeen said:
i would like to design a optics in zemax for collimation of guassian beam.
Laser beams are already pretty "collimated". In what way are you trying to improve the low divergence of the beam(s)?

Also, can you please post a link to the datasheet for the beamsplitter you are using? Thanks.
 
Yes laser beams are collimated. What i would like to achieve is as shown in figure. After the lens i should get a collimated beam as well. I dont have a data sheet for beam splitter. Beam splitter is a DOE (Diffractive optical element) which will split the incoming beam into two beam of equal intensities with an angle 5 degree to normal of surface.
 
The region where a laser beam is almost parallel is known as the Rayleigh range and it depends on the wavelength a beam "radius" w0. We need that data to help you.
 
sorry for late reply. The rayleigh range is around 3 m. The wavelength is 1064 nm and beam waist radius is 1 mm.
 

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