Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers



Laser Pointer Store

Pennsylvania man on a mission.

Joined
Jan 23, 2012
Messages
3
Likes
0
Points
0
Hello all. My experience with lasers comes from installing them into the stock of the PS90 submachine gun as a service to my customers at promotedpawn.com. A good breakdown of the laser involved can be found in this thread:
My New PS90 Project - Page 5
I've come here for some expert advice on my pet project which involves putting an as-day-visible-as-possible laser, which will work in sub-freezing temperatures, and feature a culminating lens, into the stock of my PS90. This laser must run off a single CR123 battery and the diode must be remote from the circuitry. Furthermore, the diode will be mounted to a small block of aluminum, but a larger heat sink will not be possible.
I'd like to open conversation by asking your opinion as to diode choice for this project. Many thanks.
 
Last edited:

Joined
May 4, 2009
Messages
5,462
Likes
551
Points
0
445 is your best bet here no xtals to get out of alignment with shock or temp changes.

And you can run it at 400-600ma which is with in range of a CR-123 cell.

At that power it should be no problem to see the dot on something in the day time ;)

Running at this low power it should be fine in a small copper direct press heat sink that
also houses the focusing lens, this could connect back to the driver inside the battery holder
with a small cable or even a small SS pipe.
 
Last edited:
Joined
Jan 23, 2012
Messages
3
Likes
0
Points
0
'pyro, thanks for the advice. When I can find specs on the 445nm the operating temperature is always listed as starting at 0 degrees Celsius. Is there a diode type or trick for operating in colder temperatures?
 

532 with Envy

Well-known member
Joined
Jun 19, 2010
Messages
1,491
Likes
104
Points
63
You may also want to take a look at green 532nm lasers. The beam is very easy to see in the day and also these modules are pretty easy to find in all kinds of power outputs.

As for the 445nm blue laser....check the search area here on LPF. You should be able to find everything you need.(sorry not sure the exact link, but you should be able to find it.)

Good luck and welcome!
 
Joined
May 4, 2009
Messages
5,462
Likes
551
Points
0
The colder the temp the better it's going to work.

I think you will have to get it down to -375 deg F
before the electrons will be slowed down to the
point where it will not operate :crackup:

It should be fine at your low temp :D

Now you may need some anti-fog on the lens.
 
Last edited:

electron

New member
Joined
Sep 11, 2007
Messages
1,125
Likes
62
Points
0
Welcome aboard! Don't forget to get some Laser Safety Glasses, and the search function here can be your best friend; don't forget to read the Stickies.
 

rhd

New member
Joined
Dec 7, 2010
Messages
8,492
Likes
567
Points
0
Joined
Jan 23, 2012
Messages
3
Likes
0
Points
0
How about APC based 532nm module?
I think that's what I've been working with. I'm not good enough with my circuits to tell for sure, but it doesn't seem like the current is being regulated. If you want to check it out we have a schematic drawn up on the page I linked too in my first post.
 

Haloid95

New member
Joined
Apr 5, 2011
Messages
917
Likes
32
Points
0
Dont know what his motives are, but as long as what he copies and pastes is actually good advice IMO it doesn't matter. I know a lot of veteran members who do that.





Welcome to the Forum! Like members have said before 445nm will be your best choice. Ive used my 445nm in -15 F* and it worked great. Good luck on your project!!

Edit: forgot to mention, the only thing that might be affected in cold weather is the battery, make sure to get a quality battery.
 
Last edited:




Top