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 > Optics



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



Reply
 
LinkBack Thread Tools Display Modes
Old 11-05-2010, 05:20 AM #1
Junior Member
 
Join Date: Nov 2010
Posts: 2
Rep Power: 0
Ima Firin Mah Laser is on a distinguished road
Ima Firin Mah Laser Ima Firin Mah Laser is offline
Junior Member
 
Join Date: Nov 2010
Posts: 2
Rep Power: 0
Ima Firin Mah Laser is on a distinguished road
Default Questions about Controlling Laser Power

I've been wondering if it was possible to control the power of a laser so it would be a specific number of mw's all the time.
Like, for example, could I use some type of optic to regulate my Optotronics 150mw laser to a steady 100mw?
Thanks,
Jeff


Ima Firin Mah Laser is offline   Reply With Quote







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







Old 11-05-2010, 09:23 AM #2
HIMNL9's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
HIMNL9 HIMNL9 is offline
Class 4 Laser
HIMNL9's Avatar
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
Default Re: Questions about Controlling Laser Power

You need to take part of the output beam (can be used a dichro or splitting glass) and use it as feedback for control the current driver ..... more or less this way:

Code:
               splitter
DRIVER-----LD-----\---------------------------
 |               /                        beam
 |feedback      /reflected
 |signal       / beam
  -------SENSOR
but, are you talking about lab style or handhelds ..... cause it's a bit difficult, without heavy modifications, do this for a handheld ..... for LDs that don't have a photodiode inside, is still possible, but need a lot of mechanical modifications .....
__________________
High Impulse Multipath Neutron Laser (mark 9 ) (LOL)
Dare mo mita koto no nai, kaze, kumo, suna, umi ..... Kokoro no hate no doko ka eien ga kagayaku.
HIMNL9 is offline   Reply With Quote
Old 11-05-2010, 02:44 PM #3
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,142
Rep Power: 9321
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 online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,142
Rep Power: 9321
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: Questions about Controlling Laser Power

I don't see how a dichro would work. A simple piece of glass is usually used to reflect a tiny percentage of the beam.
__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote
Old 11-06-2010, 12:42 AM #4
Junior Member
 
Join Date: Nov 2010
Posts: 2
Rep Power: 0
Ima Firin Mah Laser is on a distinguished road
Ima Firin Mah Laser Ima Firin Mah Laser is offline
Junior Member
 
Join Date: Nov 2010
Posts: 2
Rep Power: 0
Ima Firin Mah Laser is on a distinguished road
Default Re: Questions about Controlling Laser Power

So I would probably just do that and hook up a photo-resistor to the end to measure the power and connect to the driver. But then how could I do that?
Thanks.
Ima Firin Mah Laser is offline   Reply With Quote
Old 11-06-2010, 09:35 AM #5
HIMNL9's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
HIMNL9 HIMNL9 is offline
Class 4 Laser
HIMNL9's Avatar
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
Default Re: Questions about Controlling Laser Power

Well, can be done in some different ways ..... the more easy way is use a photodiode (or a photoresistor, also if they are less precise, but for this use can be good the same), in the current regulation branch of the driver (usually for this type of applications you use drivers with an op-amp for control the current ..... regardless if current sinks or sources) ..... the photoresistor must be placed in the feedback circuit in the way that, when the light increase (and the resistance decrease), it reduce proportionally the reference voltage, so the op-amp automatically try to compensate decreasing the current for the LD, til the equilibre is re-established ..... and, ofcourse, when the light decrease, it works in the opposite sense ..... not the state-of-the-art application, but it's the more simple possible .....

An alternative, can be use it through a second op-amp, that acts on the reference net ..... this gives you better stability and range, but ofcourse it complicates a bit the circuitry .....

Can also be done with a pair of transistors, but not for high current units .....
__________________
High Impulse Multipath Neutron Laser (mark 9 ) (LOL)
Dare mo mita koto no nai, kaze, kumo, suna, umi ..... Kokoro no hate no doko ka eien ga kagayaku.
HIMNL9 is offline   Reply With Quote
Reply

Tags
150mw green laser, control, milliwatts, optotronics, regulate





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 06:01 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