Collimation of a Gaussian beam

  • Context: Graduate 
  • Thread starter Thread starter Mubeen
  • Start date Start date
  • Tags Tags
    optics problem
Click For Summary

Discussion Overview

The discussion centers on the design of optics in Zemax for the collimation of a Gaussian beam, specifically focusing on off-axis rays. Participants explore the specifications of the incoming laser beam, the function of a beamsplitter, and the desired outcomes for beam collimation over a specified distance.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant seeks to design optics for collimating a Gaussian beam, clarifying that the incoming beam is a laser with a Gaussian intensity distribution.
  • Another participant questions the specification of the incoming beam and the function of the beamsplitter, seeking clarification on whether it splits the beam into two equal intensity beams.
  • A participant describes the beamsplitter as a diffractive optical element (DOE) that splits the beam at a 5-degree angle to the normal surface.
  • Concerns are raised about the collimation of the beam, with one participant noting that laser beams are already collimated and asking how the participant intends to improve upon this.
  • Participants discuss the Rayleigh range, with one providing specific parameters: a Rayleigh range of around 3 m, a wavelength of 1064 nm, and a beam waist radius of 1 mm.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the collimation process and the specifics of the beamsplitter. There is no consensus on the best approach to achieve the desired collimation, and multiple viewpoints on the effectiveness of the current setup remain unresolved.

Contextual Notes

Participants note the importance of the Rayleigh range and beam parameters in the discussion, indicating that these factors are crucial for determining the collimation effectiveness. However, the discussion does not resolve how these parameters interact with the proposed optical design.

Mubeen
Messages
8
Reaction score
0
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.
 

Attachments

  • IMG_3660 (2).jpg
    IMG_3660 (2).jpg
    38.7 KB · Views: 118
Science news on Phys.org
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.
 

Similar threads

Undergrad How Can I Expand and Collimate a Laser Pointer Beam Using Basic Optics?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate About collimation in Czerny-Turner spectrometers
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad Digital Micromirror Device based optical setup
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Prism Spectrometer Objective: Optics Question
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad What is really happening in collimation of rays?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Tilted plane wave through a 2 lens system
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Optimum profile of light pipe exit for narrow beam angle
  • · Replies 16 ·
Replies
16
Views
2K
Undergrad Using Diffraction (i.e., Fresnel Zone Plate) to defocus/diverge light
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Effect of Collimated lens on Gauss Beam
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Interferometer delay & line light spreading
  • · Replies 2 ·
Replies
2
Views
1K