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 > 445nm Lasers



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



Reply
 
LinkBack Thread Tools Display Modes
Old 09-08-2010, 06:16 PM #1
Member
 
Join Date: Jul 2010
Posts: 32
Rep Power: 0
vivioo7 is on a distinguished road
vivioo7 vivioo7 is offline
Member
 
Join Date: Jul 2010
Posts: 32
Rep Power: 0
vivioo7 is on a distinguished road
Default Dot size at 100+m?

Just curious how big the dot would be. I get the feeling it will be a large bar but if anyone has a picture or can at least confirm that would be cool tia


vivioo7 is offline   Reply With Quote







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







Old 09-08-2010, 07:20 PM #2
drummerdimitri's Avatar
Class 2M Laser
 
Join Date: Oct 2007
Location: Lebanon
Posts: 502
Rep Power: 21
drummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to behold
Send a message via MSN to drummerdimitri
drummerdimitri drummerdimitri is offline
Class 2M Laser
drummerdimitri's Avatar
 
Join Date: Oct 2007
Location: Lebanon
Posts: 502
Rep Power: 21
drummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to behold
Send a message via MSN to drummerdimitri
Default Re: Dot size at 100+m?

Well, that really depends on the laser's divergence. My 445 has a divergence of 3.57 mrad and has a 5 millimeter beam diameter or should I say width at the aperture. According to some calculations, the bar will be around 36 cm wide at a distance of 100 m. I used this link: pseudonomen137's JScript Laser Calculators to find the divergence and dot size. Hope that answered your question!
drummerdimitri is offline   Reply With Quote
Old 09-08-2010, 08:20 PM #3
Spartan X's Avatar
Class 1M Laser
 
Join Date: Jun 2010
Posts: 241
Rep Power: 10
Spartan X is a jewel in the roughSpartan X is a jewel in the roughSpartan X is a jewel in the rough
Spartan X Spartan X is offline
Class 1M Laser
Spartan X's Avatar
 
Join Date: Jun 2010
Posts: 241
Rep Power: 10
Spartan X is a jewel in the roughSpartan X is a jewel in the roughSpartan X is a jewel in the rough
Default Re: Dot size at 100+m?

Search is your friend:

DL Spartan 447nm 1 Watt Beamshot/Dot from 400m(1/4mile)

/insert shameless self promotion
__________________
My lifestyle determines my deathstyle.
Spartan X is offline   Reply With Quote
Old 09-08-2010, 08:32 PM #4
drummerdimitri's Avatar
Class 2M Laser
 
Join Date: Oct 2007
Location: Lebanon
Posts: 502
Rep Power: 21
drummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to behold
Send a message via MSN to drummerdimitri
drummerdimitri drummerdimitri is offline
Class 2M Laser
drummerdimitri's Avatar
 
Join Date: Oct 2007
Location: Lebanon
Posts: 502
Rep Power: 21
drummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to beholddrummerdimitri is a splendid one to behold
Send a message via MSN to drummerdimitri
Default Re: Dot size at 100+m?

Quote:
Originally Posted by Spartan X View Post
Search is your friend:

DL Spartan 447nm 1 Watt Beamshot/Dot from 400m(1/4mile)

/insert shameless self promotion
Damn, this divergence calculator is extremely accurate. I would get the same "dot" size at that distance!
drummerdimitri is offline   Reply With Quote
Old 09-09-2010, 02:52 AM #5
ZapU's Avatar
Class 2 Laser
 
Join Date: Aug 2010
Location: North Central Florida
Posts: 393
Rep Power: 23
ZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud of
ZapU ZapU is offline
Class 2 Laser
ZapU's Avatar
 
Join Date: Aug 2010
Location: North Central Florida
Posts: 393
Rep Power: 23
ZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud ofZapU has much to be proud of
Default Re: Dot size at 100+m?

Quote:
Originally Posted by vivioo7 View Post
Just curious how big the dot would be. I get the feeling it will be a large bar but if anyone has a picture or can at least confirm that would be cool tia
Just measured my Arctic today. At 310 ft. (94.5M) I measured it at 8 in. (20.3cm) 2.14 mRad
__________________
G1 (815mW) & G2 (900mW)
50mW 532nm FocalPrice 18650 (40mW)
5mW 532nm DX (75mW pot modded)
5mW 532nm DX (55mW pot modded)
5mW 532nm Itemquickship Super Beast (105mW!)
400mW 532nm O-like OL-532-350 (442mW)
5mW 405nm $9 ebay (45mW)
Radiant Alpha Power Meter

Care and feeding of your Arctic G1 beast - do's and don'ts review
Care and feeding of your Arctic beast part (G)2
ZapU is offline   Reply With Quote
Old 04-27-2011, 05:58 PM #6
Junior Member
 
Join Date: Apr 2011
Posts: 1
Rep Power: 0
calebgold is on a distinguished road
calebgold calebgold is offline
Junior Member
 
Join Date: Apr 2011
Posts: 1
Rep Power: 0
calebgold is on a distinguished road
Default Re: Dot size at 100+m?

To be honest that calculator is way over my head.
I believe we all have our strengths and weaknesses and trying to figure the dot size is kicking my butt.
What I’m looking for is a way to tell what the dot size will be say at 10 15 feet.
I’m just looking to pick up a laser pointer with a big dot to play with my dog and the little tiny dots get lost on the grass.

Any help?

Thanks!
-Caleb
calebgold is offline   Reply With Quote
Old 04-27-2011, 06:22 PM #7
Class 3R Laser
 
Join Date: Jun 2007
Posts: 1,636
Rep Power: 14605
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: 1,636
Rep Power: 14605
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: Dot size at 100+m?

Quote:
Originally Posted by calebgold View Post
To be honest that calculator is way over my head.
I believe we all have our strengths and weaknesses and trying to figure the dot size is kicking my butt.
What Iím looking for is a way to tell what the dot size will be say at 10 15 feet.
Iím just looking to pick up a laser pointer with a big dot to play with my dog and the little tiny dots get lost on the grass.

Any help?

Thanks!
-Caleb
The easiest way is too get out there and measure it.

Wrapping your brain around beam divergence isn't difficult. Assuming your beam is Gaussian [ it isn't] a laser with a beam divergence of 1millirad would diverge 1 millimeter for every meter of travel once it passes beyond the Rayleigh Range [length]. With a blue laser like you have there is a fast axis and a slow axis. This means that the beam will expand quicker in one dimension than it will in the other.

Your dog I'm sure will have no trouble seeing the a small dot.
steve001 is offline   Reply With Quote
Old 04-27-2011, 10:27 PM #8
Helios's Avatar
Class 3R Laser
 
Join Date: Jan 2011
Location: Minnesota
Posts: 1,337
Rep Power: 56
Helios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond repute
Helios Helios is offline
Class 3R Laser
Helios's Avatar
 
Join Date: Jan 2011
Location: Minnesota
Posts: 1,337
Rep Power: 56
Helios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond reputeHelios has a reputation beyond repute
Default Re: Dot size at 100+m?

Quote:
Originally Posted by calebgold View Post
To be honest that calculator is way over my head.
I believe we all have our strengths and weaknesses and trying to figure the dot size is kicking my butt.
What I’m looking for is a way to tell what the dot size will be say at 10 15 feet.
I’m just looking to pick up a laser pointer with a big dot to play with my dog and the little tiny dots get lost on the grass.

Any help?

Thanks!
-Caleb
A 445nm is not a good dog laser unless you are running it at its minimum threshold which no one does. Get a true 5mW green laser so that theres less risk of your dog going blind from accidental flashes. Green (532nm) is more visible to human eye (dogs too?) so it will appear much brighter than 5mW of 445nm or 650nm etc etc.


If you want a bigger dot just get a focusable laser. Then you can make the dot as wide as a flashlight beam if you wanted to.

Last edited by Helios; 04-27-2011 at 10:28 PM.
Helios is offline   Reply With Quote
Old 04-28-2011, 12:14 AM #9
DrSid's Avatar
Class 3R Laser
 
Join Date: Jul 2010
Location: Olomouc, Czech Republic
Posts: 1,516
Rep Power: 153
DrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond repute
DrSid DrSid is offline
Class 3R Laser
DrSid's Avatar
 
Join Date: Jul 2010
Location: Olomouc, Czech Republic
Posts: 1,516
Rep Power: 153
DrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond reputeDrSid has a reputation beyond repute
Default Re: Dot size at 100+m?

With 445 you also must be careful .. the long axis at aperture will be the short one at distance, and vice versa.
Best approach is to disregard aperture size completely, and measure only size at distance (10m at least, better 100m). At such distances aperture size has no effect, and you can also use much simpler formula: divergence=size/distance (both size and distance units must be the same). You really don't need clunky divergence calculator.
__________________
200mw (35mw compared) FocalPrice cheap green AA - Review
500mw (estimated) 445nm Minimalistic Orange Emos Direct Drive. Thread
1500mw (estimated) 445nm Jayrob's Solarforce L2P. Review
DrSid 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 11:30 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