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





One laser store meets all your needs

Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > General





Reply
 
LinkBack Thread Tools Display Modes
Old 01-18-2017, 10:26 PM #1
Junior Member
 
Join Date: Jan 2017
Posts: 1
Rep Power: 0
cmcrae1019 is on a distinguished road
cmcrae1019 cmcrae1019 is offline
Junior Member
 
Join Date: Jan 2017
Posts: 1
Rep Power: 0
cmcrae1019 is on a distinguished road
Default Laser image shape/cross section

Hi everyone! New here and new to lasers but I have been reading the site over the past week or so trying to educate myself.

My question is about the shape of the laser on the cast on the wall. If the beam is collimated it's going to be a small circle on the wall and using lensing I could defocus that beam to be a larger circle on the wall at the same distance.

Is it possible to create other shapes without losing any energy density? To me the obvious solution would be to block out the parts of the circle that don't fit the desired shape but is it possible to focus the beam into say a star or a square without losing any of that energy density?


cmcrae1019 is offline   Reply With Quote


















Old 01-18-2017, 11:28 PM #2
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,177
Rep Power: 17961
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is offline
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,177
Rep Power: 17961
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: Laser image shape/cross section

Quote:
Originally Posted by cmcrae1019 View Post
Is it possible to create other shapes without losing any energy density?
You can increase energy density by leaving the laser on longer. Maybe you mean power density? Power and energy are quite different.

Power density wouldn't make sense either, because all alterations to the beam profile will change power density. Maybe you mean power? Power and power density are quire different.

Power wouldn't really make sense either. No optic is 100% efficient (except maybe a window at Brewster's angle.)

Maybe we'll just get rid of that caveat all-together. Yes, there are optics that change the beam projection from a dot to something else without masking a portion of the beam. Diffraction gratings and cylinder lenses are the most common.
__________________
A problem well stated is a problem half solved.
Cyparagon 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


LinkBacks (?)
LinkBack to this Thread: http://laserpointerforums.com/f44/laser-image-shape-cross-section-99652.html
Posted By For Type Date
Laser Pointer Forums - Discuss Laser Pointers This thread Refback 01-19-2017 02:16 AM










Loading
















Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 04:28 AM.


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