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 > Science & Lasers



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



Reply
 
LinkBack Thread Tools Display Modes
Old 04-20-2013, 05:08 AM #1
TwistedLight's Avatar
Junior Member
 
Join Date: Apr 2013
Posts: 16
Rep Power: 0
TwistedLight will become famous soon enoughTwistedLight will become famous soon enough
TwistedLight TwistedLight is offline
Junior Member
TwistedLight's Avatar
 
Join Date: Apr 2013
Posts: 16
Rep Power: 0
TwistedLight will become famous soon enoughTwistedLight will become famous soon enough
Default what is OD?

Someone explain it please.....
Does more OD=Protection against more Watts? If so, what is the ratio? (Realtionship between OD and number of watts it protects against)
Is higher OD super important?


__________________
Lasers I own:
200mw 532nm pen style

Can anyone point me to a good site to buy laser diodes/ from?
TwistedLight is offline   Reply With Quote







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







Old 04-20-2013, 10:12 AM #2
Fiddy's Avatar
Class 3B Laser
 
Join Date: May 2011
Location: Down Under
Posts: 2,747
Rep Power: 311
Fiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond repute
Fiddy Fiddy is offline
Class 3B Laser
Fiddy's Avatar
 
Join Date: May 2011
Location: Down Under
Posts: 2,747
Rep Power: 311
Fiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond repute
Default Re: what is OD?

OD = Optical density or simple terms absorbance.

Its pretty much a number for the ratio between how much light of a certain wavelength is upon your safety glasses to how much will transmit through your safety glasses.

A higher OD is better, especially with lasers that are 1W+ as it absorbs more of the light instead of letting it transmit through your glasses, into your eyes.

Small percentages of transmittance of such high output lasers such as the 9mm 445nm diodes can add up to quiet a few extra mW's that could transmit your glasses if i direct hit was upon your glasses.

This is my understanding, im sure the people who work in the industry will have something to add
__________________
405nm - 1,910mW (6)
445nm - 15,895mW (15)
450nm - 370mW (2)
473nm - 110mW (2)
532nm - 1250mW (6)
632.8nm - 2mW (1)
637nm - 5105mW (8)
660nm - 1,850mW (5)
670nm - 600mW (1)
685nm - 40mW (1)
808nm - 2,700mW (3)
RGB - 400mW (1)

In Progress:
405nm - 500mW+ Kryton Groove
445nm - 2,000mW+ C-88
520nm - 50mW Ultrafire RL-118 SS
632.8nm - 0.5mW Mini HeNe

Safety Glasses
2x Eagle Pair OD4+ 190nm-540nm
2x Eagle Pair OD4+ 90-400nm & 580-760nm
OEM Lasers OD 5+ 190-435nm & 730-1085nm

LaserBee 5W Laser Power Meter


>Fiddy's Review/Tutorial/Build Compilation Thread<
>>FS: Custom Glow Rings<<
>>>Plasma Speaker Kits (High Frequency Audio Tesla Coil) reserve yours today!<<<

CajunLasers FTW!

Last edited by Fiddy; 04-20-2013 at 10:20 AM.
Fiddy is offline   Reply With Quote
Old 04-20-2013, 03:11 PM #3
TwistedLight's Avatar
Junior Member
 
Join Date: Apr 2013
Posts: 16
Rep Power: 0
TwistedLight will become famous soon enoughTwistedLight will become famous soon enough
TwistedLight TwistedLight is offline
Junior Member
TwistedLight's Avatar
 
Join Date: Apr 2013
Posts: 16
Rep Power: 0
TwistedLight will become famous soon enoughTwistedLight will become famous soon enough
Default Re: what is OD?

OK, so for 1W-2W lasers, what OD should I have?
__________________
Lasers I own:
200mw 532nm pen style

Can anyone point me to a good site to buy laser diodes/ from?
TwistedLight is offline   Reply With Quote
Old 04-20-2013, 03:53 PM #4
Fiddy's Avatar
Class 3B Laser
 
Join Date: May 2011
Location: Down Under
Posts: 2,747
Rep Power: 311
Fiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond repute
Fiddy Fiddy is offline
Class 3B Laser
Fiddy's Avatar
 
Join Date: May 2011
Location: Down Under
Posts: 2,747
Rep Power: 311
Fiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond repute
Default Re: what is OD?

at least OD3.

OD 3 will give a transmissions of 2mW if 2,000mW is put upon the safety glasses.
__________________
405nm - 1,910mW (6)
445nm - 15,895mW (15)
450nm - 370mW (2)
473nm - 110mW (2)
532nm - 1250mW (6)
632.8nm - 2mW (1)
637nm - 5105mW (8)
660nm - 1,850mW (5)
670nm - 600mW (1)
685nm - 40mW (1)
808nm - 2,700mW (3)
RGB - 400mW (1)

In Progress:
405nm - 500mW+ Kryton Groove
445nm - 2,000mW+ C-88
520nm - 50mW Ultrafire RL-118 SS
632.8nm - 0.5mW Mini HeNe

Safety Glasses
2x Eagle Pair OD4+ 190nm-540nm
2x Eagle Pair OD4+ 90-400nm & 580-760nm
OEM Lasers OD 5+ 190-435nm & 730-1085nm

LaserBee 5W Laser Power Meter


>Fiddy's Review/Tutorial/Build Compilation Thread<
>>FS: Custom Glow Rings<<
>>>Plasma Speaker Kits (High Frequency Audio Tesla Coil) reserve yours today!<<<

CajunLasers FTW!

Last edited by Fiddy; 04-20-2013 at 04:18 PM.
Fiddy is offline   Reply With Quote
Old 04-20-2013, 04:05 PM #5
pschlosser's Avatar
Class 2M Laser
 
Join Date: Dec 2012
Location: Santa Rosa, CA
Posts: 909
Rep Power: 65
pschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond repute
pschlosser pschlosser is offline
Class 2M Laser
pschlosser's Avatar
 
Join Date: Dec 2012
Location: Santa Rosa, CA
Posts: 909
Rep Power: 65
pschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond reputepschlosser has a reputation beyond repute
Default Re: what is OD?

Quote:
Originally Posted by TwistedLight View Post
OK, so for 1W-2W lasers, what OD should I have?
Bear in mind, Optical Density (Absorbance) is also logarithmic. An OD of zero (0) absorbs nothing, no light, and transmits (or passes through the goggles) 100% of the light.

OD = 0, transmits 100% of the light
OD = 1, transmits 10% of the light
OD = 2, transmits 1% of the light
OD = 3, transmits 0.1% of the light.

Our eyes are supposed to be safe exposed to 5mW, so in an ideal situation, you want safety goggles with enough OD to reduce your laser beam brightness to 5mW.

With a 2W laser, as an example, that is 2000mW.

OD = 0, transmits 2000mW
OD = 1, transmits 200mW
OD = 2, transmits 20mW
OD = 3, transmits 2mW

So, if you want to make sure your goggles will be safe enough with a 2W laser, you will need at least goggles with an OD of 3 at the wavelength of the laser light. This is important to make sure the goggles absorb at the target wavelength of light. Because red goggles will NOT filter out red, but may do a great job of blocking blue.

An OD too high, is a problem, too. If you block out too much of the light, then you can't see it at all. And where is the fun in that?

Last edited by pschlosser; 04-20-2013 at 04:07 PM.
pschlosser is offline   Reply With Quote
Old 04-20-2013, 04:12 PM #6
Fiddy's Avatar
Class 3B Laser
 
Join Date: May 2011
Location: Down Under
Posts: 2,747
Rep Power: 311
Fiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond repute
Fiddy Fiddy is offline
Class 3B Laser
Fiddy's Avatar
 
Join Date: May 2011
Location: Down Under
Posts: 2,747
Rep Power: 311
Fiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond reputeFiddy has a reputation beyond repute
Default Re: what is OD?

edit herp derp on my part
__________________
405nm - 1,910mW (6)
445nm - 15,895mW (15)
450nm - 370mW (2)
473nm - 110mW (2)
532nm - 1250mW (6)
632.8nm - 2mW (1)
637nm - 5105mW (8)
660nm - 1,850mW (5)
670nm - 600mW (1)
685nm - 40mW (1)
808nm - 2,700mW (3)
RGB - 400mW (1)

In Progress:
405nm - 500mW+ Kryton Groove
445nm - 2,000mW+ C-88
520nm - 50mW Ultrafire RL-118 SS
632.8nm - 0.5mW Mini HeNe

Safety Glasses
2x Eagle Pair OD4+ 190nm-540nm
2x Eagle Pair OD4+ 90-400nm & 580-760nm
OEM Lasers OD 5+ 190-435nm & 730-1085nm

LaserBee 5W Laser Power Meter


>Fiddy's Review/Tutorial/Build Compilation Thread<
>>FS: Custom Glow Rings<<
>>>Plasma Speaker Kits (High Frequency Audio Tesla Coil) reserve yours today!<<<

CajunLasers FTW!

Last edited by Fiddy; 04-20-2013 at 04:18 PM.
Fiddy is offline   Reply With Quote
Old 04-20-2013, 04:20 PM #7
TwistedLight's Avatar
Junior Member
 
Join Date: Apr 2013
Posts: 16
Rep Power: 0
TwistedLight will become famous soon enoughTwistedLight will become famous soon enough
TwistedLight TwistedLight is offline
Junior Member
TwistedLight's Avatar
 
Join Date: Apr 2013
Posts: 16
Rep Power: 0
TwistedLight will become famous soon enoughTwistedLight will become famous soon enough
Default Re: what is OD?

Quote:
Originally Posted by pschlosser View Post
Bear in mind, Optical Density (Absorbance) is also logarithmic. An OD of zero (0) absorbs nothing, no light, and transmits (or passes through the goggles) 100% of the light.

OD = 0, transmits 100% of the light
OD = 1, transmits 10% of the light
OD = 2, transmits 1% of the light
OD = 3, transmits 0.1% of the light.

Our eyes are supposed to be safe exposed to 5mW, so in an ideal situation, you want safety goggles with enough OD to reduce your laser beam brightness to 5mW.

With a 2W laser, as an example, that is 2000mW.

OD = 0, transmits 2000mW
OD = 1, transmits 200mW
OD = 2, transmits 20mW
OD = 3, transmits 2mW

So, if you want to make sure your goggles will be safe enough with a 2W laser, you will need at least goggles with an OD of 3 at the wavelength of the laser light. This is important to make sure the goggles absorb at the target wavelength of light. Because red goggles will NOT filter out red, but may do a great job of blocking blue.

An OD too high, is a problem, too. If you block out too much of the light, then you can't see it at all. And where is the fun in that?
Thank you for your answer, this is EXACTLY what I was looking for.
__________________
Lasers I own:
200mw 532nm pen style

Can anyone point me to a good site to buy laser diodes/ from?

Last edited by TwistedLight; 04-20-2013 at 04:21 PM.
TwistedLight is offline   Reply With Quote
Old 04-20-2013, 04:21 PM #8
TwistedLight's Avatar
Junior Member
 
Join Date: Apr 2013
Posts: 16
Rep Power: 0
TwistedLight will become famous soon enoughTwistedLight will become famous soon enough
TwistedLight TwistedLight is offline
Junior Member
TwistedLight's Avatar
 
Join Date: Apr 2013
Posts: 16
Rep Power: 0
TwistedLight will become famous soon enoughTwistedLight will become famous soon enough
Default Re: what is OD?

fiddy, thanks for your help too.
__________________
Lasers I own:
200mw 532nm pen style

Can anyone point me to a good site to buy laser diodes/ from?
TwistedLight is offline   Reply With Quote
Old 04-20-2013, 11:08 PM #9
Shakenawake's Avatar
Class 3R Laser
 
Join Date: Mar 2013
Location: Colorado
Posts: 1,708
Rep Power: 2547
Shakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond repute
Shakenawake Shakenawake is offline
Class 3R Laser
Shakenawake's Avatar
 
Join Date: Mar 2013
Location: Colorado
Posts: 1,708
Rep Power: 2547
Shakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond reputeShakenawake has a reputation beyond repute
Default Re: what is OD?

this is a pretty helpful thread, I learned something. looks like both my pairs are OD4 for the wavelengths I use
__________________
501B BDR-209 16X 405nm 630mW @.52Ag lens
Host by Ehgemus NUBM44 450nm 6.8W @4.5A g lens
Host by Ehgemus M462 462nm 1.5W @1.2A g lens
Dominator NUBM07E 465nm 4.3W @3.5A g lens
L2P Nichi@ NDG4216 515nm 110mW @ .35A
501B by Blord osr@m PL520 520nm 95mW @.3A g lens
PL-E pro from Jetlasers nichi@ NDG7475 520nm 980mW, 730mW w/ 10X BE

Lasermax Genesis sight 532nm 5mW
RPL from Optotronics 532nm 450mW

Spartan from Dragonlasers 589nm 50mW
501B HL63133DG 638nm 210mW @.3A g lens
501B Ocl@ro HL63193MG 638nm 960mW @1.3A g lens

501B by Blord LPC 826 660nm 325mW @?A g lens
PL660 from Laserbtb 660nm 1020mW

LPM
DL matrix and fan transmission gratings

laser powers in sig are about 20 seconds into duty cycle, not peak powers

http://laserpointerforums.com/f39/co...her-94720.html

(I guess I am a vet now)
Shakenawake is offline   Reply With Quote
Old 04-21-2013, 02:03 AM #10
TheDukeAnumber1's Avatar
Class 3R Laser
 
Join Date: Jun 2012
Location: Illinois
Posts: 2,045
Rep Power: 2270
TheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond repute
TheDukeAnumber1 TheDukeAnumber1 is offline
Class 3R Laser
TheDukeAnumber1's Avatar
 
Join Date: Jun 2012
Location: Illinois
Posts: 2,045
Rep Power: 2270
TheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond reputeTheDukeAnumber1 has a reputation beyond repute
Default Re: what is OD?

Outer Diameter, O wait different field
__________________
“Absence of evidence isn't evidence of absence."
http://laserpointerforums.com/donations.htm
[SIZE="1"]“It is impossible that any ill should happen to the man who is beloved of the Lord; the most crushing calamities can only shorten his journey and hasten him to his reward. Ill to him is no ill, but only good in a mysterious form. Losses enrich him, sickness is his medicine, reproach is his honour, death is his gain. No evil in the strict sense of the word can happen to him, for everything is overruled for good. Happy is he who is in such a case. He is secure where others are in peril, he lives where others die.”—Spurgeon
TheDukeAnumber1 is offline   Reply With Quote
Old 04-21-2013, 02:06 AM #11
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is offline
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: what is OD?

Remember that while OD 2.5 will keep you safe against 1W of power, it is still relatively bright (laser pointer bright). Your eyes are amazingly sensitive to light. For wavelengths such as 532nm you should seek out ODs that are quite a bit higher, even as high as OD 6-7, so that it's comfortable for you working with those lasers (for alignment, etc.).

Also, remember to consider the visible light through (VLT) rating of the goggles you buy. That determines how much other light passes through the goggles so that you can see what you're doing. Generally, you want the VLT to be as high as possible, while still protecting you against the specific wavelengths you need protection against.
__________________
You must spread some Reputation around before giving it to <person> again.
Bionic-Badger is offline   Reply With Quote
Reply

Tags
density, optical





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 10:52 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