Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Experiments & Modifications



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 06-17-2007, 07:53 AM #1
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
stevetexas stevetexas is offline
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
Default Low divergence optics

I'm thinking about making a low divergence add on for my Aries (the same principles can be used for other lasers)

http://www.mellesgriot.com/products/optics/fo_4.htm

Basically, I would get a "cap" *1.5" in diameter and add an achromatic or plano convex lens to it (flatter side toward the beam source). *Hopefully it will make the divergence better. *I've just purchased about $100 worth of lenses and mounts from Sunex (http://www.optics-online.com/) and I'll keep you all up to date.

The biggest problem will be centering the mount on my laser so the axis of the beam is parallel to the axis of the lens.
Attached Thumbnails
Low divergence optics-fig1_24.gif  


stevetexas is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 06-18-2007, 02:44 PM #2
Class 3R Laser
 
Join Date: Jun 2007
Posts: 1,627
Rep Power: 13200
steve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond repute
steve001 steve001 is offline
Class 3R Laser
 
Join Date: Jun 2007
Posts: 1,627
Rep Power: 13200
steve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond repute
Default Re: Low divergence optics

steve, if you have a machined shop in your area I'd speak with them to see if they can machine parts that screw in to your laser.
you don't need an achromatic lens, a plano-convex will work nicely. Then new lens should have a focal length a least 10mm longer than the one presently on the laser so you notice a real difference in beam divergence. Look down a few posts for light machinery optical calculators I posted a link to an applet for calculating beam divergence based upon the focal lengths of the lenses used. I have done what you want to do. I replaced both lenses with new ones both are AR coated Vis0 from Edmund Opticals. They will send you a free catalog. One lens has a focal length of -6mm and the other a focal length of 48mm. Spot size at 351 feet is about 3.5-4cm
steve001 is offline   Reply With Quote
Old 06-18-2007, 04:45 PM #3
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
stevetexas stevetexas is offline
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
Default Re: Low divergence optics

What I'm trying to do is keep the Aries "stock" and make an "add-on" that I can place a laser mount on. *I have already purchased the lenses and mounts. *Now we just have to wait for them to arrive.

thanks for the link and ideas!!!
stevetexas is offline   Reply With Quote
Old 06-18-2007, 05:03 PM #4
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
stevetexas stevetexas is offline
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
Default Re: Low divergence optics

This is the set of optics I ordered. *I think I should have enough lenses to improve the beam.
I will make a post again once I have the parts and everything assembled and tested.

Item * * * * Description * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Cost $

CMT830 * *Lens holder, M8x0.5, 5.6, centered * * * * * * * * * * * * * * * * * 6.00 *
PXP005 * * Plano-convex lens precision grade BK7 D= 8 EFL= 10 * * * *14.25 *
CMT746A *Lens holder, M8x0.35, centered **ideal for DSL746** * * * *6.00 *
PXP015 * * Plano-convex lens precision grade BK7 D= 8 EFL= 18 * * * *14.25
ACH008-016 * *Achromatic doubet lens, D=8, EFL=16 * * * * * * * * * * * *27.50
PXP009 * *Plano-convex lens precision grade BK7 D= 8 EFL= 15 * * * * 14.25 *
stevetexas is offline   Reply With Quote
Old 06-18-2007, 07:14 PM #5
Class 3R Laser
 
Join Date: Oct 2006
Posts: 2,032
Rep Power: 31
pseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud of
pseudonomen137 pseudonomen137 is offline
Class 3R Laser
 
Join Date: Oct 2006
Posts: 2,032
Rep Power: 31
pseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud of
Default Re: Low divergence optics

Quote:
Originally Posted by stevetexas
This is the set of optics I ordered. *I think I should have enough lenses to improve the beam.
I will make a post again once I have the parts and everything assembled and tested.

Item * * * * Description * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Cost $

CMT830 * *Lens holder, M8x0.5, 5.6, centered * * * * * * * * * * * * * * * * * 6.00 *
PXP005 * * Plano-convex lens precision grade BK7 D= 8 EFL= 10 * * * *14.25 *
CMT746A *Lens holder, M8x0.35, centered **ideal for DSL746** * * * *6.00 *
PXP015 * * Plano-convex lens precision grade BK7 D= 8 EFL= 18 * * * *14.25
ACH008-016 * *Achromatic doubet lens, D=8, EFL=16 * * * * * * * * * * * *27.50
PXP009 * *Plano-convex lens precision grade BK7 D= 8 EFL= 15 * * * * 14.25 *
If your goal is to improve divergence, you'll need to increase the beam diameter. By adding on lenses, you will NOT simply improve the beam (otherwise the manufacturer would have already done that with the high end). What you can do it trade off min diameter with divergence.

The way you do this is by "upcollimating the beam". The general ideal is that you diverge the beam to make it larger, and then recollimate it so you have a larger spot, but in return you get better divergence when properly aligned.

The problem I see with the list you have is that there are no diverging/concave/negative focus lenses. You can work around this by using a regular positive focus one as it will diverge after the focus, but that means you'll have to place the re-collimating lens much further away. For instance, using a positive converging lens at +15mm focus instead of a negative diverging at -15mm would increase the length of your add on by a little over an inch.. if that matters to you.

After that though, you just need to use a stronger lens for divergence and a weaker one for converging. As a rough estimate, take the absolute value of the converging lens' focal divided by the diverging lens' focal and that is about how many times your divergence will be improved, and how much larger your minimum spot size will be.

Good luck! And out of curiosity, how are you planning on attaching the setup to your laser?
pseudonomen137 is offline   Reply With Quote
Old 06-18-2007, 10:18 PM #6
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
stevetexas stevetexas is offline
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
Default Re: Low divergence optics

To mount it (reversibly) I'll be using 1.5" copper end cap with 6 set-screws (3 in front, 3 in back) to hold it in position and align it over the head of the Aries. *I'll drill out a hole in the cap for the beam, and epoxy the mount at the front. *

The set screws will allow percise alignment of the axis of the mount with the axis of the beam since there is some space between the cap and the head of the Aries.
stevetexas is offline   Reply With Quote
Old 06-19-2007, 01:50 AM #7
Class 3R Laser
 
Join Date: Jun 2007
Posts: 1,627
Rep Power: 13200
steve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond repute
steve001 steve001 is offline
Class 3R Laser
 
Join Date: Jun 2007
Posts: 1,627
Rep Power: 13200
steve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond repute
Default Re: Low divergence optics

Quote:
Originally Posted by stevetexas
This is the set of optics I ordered. I think I should have enough lenses to improve the beam.
I will make a post again once I have the parts and everything assembled and tested.

Item Description Cost $

CMT830 Lens holder, M8x0.5, 5.6, centered 6.00
PXP005 Plano-convex lens precision grade BK7 D= 8 EFL= 10 14.25
CMT746A Lens holder, M8x0.35, centered **ideal for DSL746** 6.00
PXP015 Plano-convex lens precision grade BK7 D= 8 EFL= 18 14.25
ACH008-016 Achromatic doubet lens, D=8, EFL=16 27.50
PXP009 Plano-convex lens precision grade BK7 D= 8 EFL= 15 14.25
I've got some bad news for you. None of the lens you've bought will greatly improve your beam divergence. If you swap out the old lenses for new there will be no improvement and it could actually be worst.
The expander lens always has to have a noticeably shorter focal length than the collimating lens. To keep the working distance between lenses short the expander lens must be a negative focal length. I think typically the collimating lens in these tpyes of laser is anywhere from 15-18mm EFL. You can before hand determine by using the applet I mention previously what your new beam divergence will be if you input the beam diameter and beam divergence as per specs.into the first two boxes in the gaussian beam applet then input the focal lengths of the lenses into the other appropriate boxes. Distances between lenses must be taken into account.

steve001 is offline   Reply With Quote
Old 06-19-2007, 02:29 AM #8
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
stevetexas stevetexas is offline
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
Default Re: Low divergence optics

I don't intend to open the laser - I will add on optics in the beam path. I'll epoxy the lens holder in the beam path at the front of the cap...
Attached Thumbnails
Low divergence optics-optics_head_small.gif  
stevetexas is offline   Reply With Quote
Old 06-19-2007, 02:30 AM #9
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
stevetexas stevetexas is offline
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
Default Re: Low divergence optics

another view
Attached Thumbnails
Low divergence optics-optics_head2_small.gif  
stevetexas is offline   Reply With Quote
Old 06-19-2007, 02:31 AM #10
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
stevetexas stevetexas is offline
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
Default Re: Low divergence optics

This is just a prototype but it works for its purpose - I'll be making another one that is a little nicer
Attached Thumbnails
Low divergence optics-optics_head_3_small.gif  
stevetexas is offline   Reply With Quote
Old 06-19-2007, 02:31 AM #11
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
stevetexas stevetexas is offline
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
Default Re: Low divergence optics

See - the cap is removeable - no need to mess with the internal optics
Attached Thumbnails
Low divergence optics-optics_head_4_small.gif  
stevetexas is offline   Reply With Quote
Old 06-19-2007, 02:31 AM #12
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
stevetexas stevetexas is offline
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
Default Re: Low divergence optics

inside view.
Attached Thumbnails
Low divergence optics-optics_head5_small.gif  
stevetexas is offline   Reply With Quote
Old 06-19-2007, 02:39 AM #13
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
stevetexas stevetexas is offline
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
Default Re: Low divergence optics

even if it doesn't work to narrow the beam, I will still be able to add filters, lenses and diffraction gratings just to modify the beam...
stevetexas is offline   Reply With Quote
Old 06-19-2007, 03:35 AM #14
Class 3R Laser
 
Join Date: Oct 2006
Posts: 2,032
Rep Power: 31
pseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud of
pseudonomen137 pseudonomen137 is offline
Class 3R Laser
 
Join Date: Oct 2006
Posts: 2,032
Rep Power: 31
pseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud ofpseudonomen137 has much to be proud of
Default Re: Low divergence optics

Stevetexas, did you read my post about upcollimation? Any single lens will just ruin your beam specs by bringing it to a close focus. With the diverging/converging combo you can make a beam expander to lower divergence. You probably want a diverging lens too though as getting by with two convergings is just a bit of a waste of space.
pseudonomen137 is offline   Reply With Quote
Old 06-19-2007, 03:43 AM #15
SenKat
Guest
 
Posts: n/a
SenKat
Guest
 
Posts: n/a
Default Re: Low divergence optics

That looks like a nice option to have for an Aries !
  Reply With Quote
Old 06-19-2007, 04:43 AM #16
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
stevetexas stevetexas is offline
Class 2M Laser
 
Join Date: Feb 2007
Posts: 609
Rep Power: 23
stevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud ofstevetexas has much to be proud of
Default Re: Low divergence optics

Quote:
Originally Posted by pseudonomen137
Stevetexas, did you read my post about upcollimation? Any single lens will just ruin your beam specs by bringing it to a close focus. With the diverging/converging combo you can make a beam expander to lower divergence. You probably want a diverging lens too though as getting by with two convergings is just a bit of a waste of space.
Pseudo - yes, I did read it and am looking for a suitable optic now - thanks for the input!!!
stevetexas is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 11:21 PM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC