Collimation of a Gaussian beam

[Mubeen]

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.

 

[BvU]

Hello and

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 ?

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[Mubeen]

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.

 

[BvU]

No need to apologize.
I only know cube and plate type beamsplitters, so I wonder how this one works

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 Guass

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[Mubeen]

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.

 

[berkeman]

Welcome to PF.

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.

 

[Mubeen]

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.

 

[Gordianus]

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.

 

[Mubeen]

sorry for late reply. The rayleigh range is around 3 m. The wavelength is 1064 nm and beam waist radius is 1 mm.