Troubleshooting Laser Instrument Issues

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Discussion Overview

The discussion revolves around troubleshooting issues related to creating parallel laser beams for an optical instrument. Participants explore various optical setups and components that could facilitate this, including the use of laser diodes, lenses, and beam splitters. The scope includes practical applications and experimental setups.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant seeks to create parallel beams from a single laser pointer and asks for suitable optical setups.
  • Another participant suggests using multiple beam splitters as a potential solution for achieving parallel beams.
  • It is proposed that using a diffractive grating and small mounted mirrors could be a cost-effective method, though it may be challenging to align the mirrors accurately.
  • A participant shares an image of an optical setup they believe may be helpful and asks for opinions on its effectiveness.
  • One participant describes their project involving an array of light-dependent resistors (LDRs) and expresses the need for a line laser to focus beams on each LDR.
  • Another participant mentions that collimating a laser beam can be achieved by using a lens with a specific focal length to match the beam's divergence.
  • A participant expresses confidence in a particular optical setup they found, suggesting it will work well for their intended application with LDRs.
  • Questions arise about whether a red line laser combined with a collimator lens would suffice for creating the desired parallel beams.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best method to achieve parallel laser beams, with multiple competing views and suggestions presented throughout the discussion.

Contextual Notes

Some participants express uncertainty about the effectiveness of various proposed setups, and there are unresolved questions regarding the alignment and precision of optical components.

Who May Find This Useful

This discussion may be useful for individuals interested in optical engineering, DIY laser projects, or those troubleshooting similar issues in creating laser-based instruments.

hesen
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I am trying to build the instrument according to this link http://www.inventgeek.com/2009-Projects/Laser-Instrument/page5.aspx I am having problems with lasers.I can not focus the laser dot on the photoresistor.So I thought about laser array(fabricated)but i could not find it.So I am now thinking about line laser.But it doesn't have parallel laser lines.(like this http://www.dragonlasers.com/catalog/photos/products/LLGL04.jpg)What kind of optic setup can create parallel lines act like http://a.imageshack.us/img13/4710/diodos.png or any other suggestion?
Thanks
 
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Your question does not make sense. Do you mean parallel beams from different lasers, or from the same laser?
 
Right Chris,infact I mean parallel beams from the same laser check this(http://www.bitmakers.com/files/imagenes/550_fp_lx2v.jpg)Is it possible to create parallel beams from just a laser pointer with an optical setup?And what kind of setup does this job?
 
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The cheapest way to achieve parallel beam array would be by using diffractive grating and small mounted mirrors, though it will be very hard to set precisely mirrors because of small incident beam angles.

Of course the easiest way and also quite cheap would be just to buy as much laser diodes as needed.
 
I guess I found what I exactly need.
http://www.metralight.com/images/AXA_web.jpg
Analysing this optical setup can be helpful.Opinions?
 
The image you linked to just looks like a collimater.

You can collimate a beam quite easily by matching the divergence of the beam with a lens of a particular focal length.

If you explain your problem in more detail, we can assist more.

Claude.
 
I built a ldr array(approx.30 ldrs)All of them adjacent.I want to focus laser beams on them.So I have to put laser diode in front of each ldr.And important part is each ldr must have its beam from the front one.But glueing is problem so I want to do it with a line laser.I thought convex lens can be helpful with creating parallel lines like in the pic http://www.metralight.com/images/AXA_web.jpg Today I noticed laser ray box while googling. http://www.a3bs.com/imagelibrary/U17301/U17301_05_Laser-Optics-Supplemental-Set-with-Laser-Ray-Box.jpg I want to know the easiest way to do it.
 
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I am sure this optical setup will be perfect.

http://www.sensorcentral.com/micrometers/img/ccd_exmplanation.gif

I will use ldrs as sensor receiver.When object placed between sensor and lens,it will have a dark projection of object on ldr array.

Will a red line laser and collimater lens be enough to create parallel beams?
 
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