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 08-19-2010, 10:35 PM #1
Zike's Avatar
Member
 
Join Date: Jun 2010
Posts: 31
Rep Power: 0
Zike has a spectacular aura aboutZike has a spectacular aura about
Zike Zike is offline
Member
Zike's Avatar
 
Join Date: Jun 2010
Posts: 31
Rep Power: 0
Zike has a spectacular aura aboutZike has a spectacular aura about
Default Absorptive ND2 filter

Hi,

I'm looking for an absorptive (not reflective) ND2 filter, do you have a reliable (really ND2 - 50%) source for such ?

So far I only found (ang got) reflective ND2 filters which are pretty dangerous to handle with lasers...

Thanks.



Last edited by Zike; 08-19-2010 at 10:36 PM. Reason: Typos
Zike is offline   Reply With Quote







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







Old 08-20-2010, 03:46 PM #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
Question Re: Absorptive ND2 filter

Not sure ..... anyway, ND are not 50%-pass optics, are 10%-pass optics ..... the 50% one that you mention are 1-stop photographic optics (they are 2 totally different scales, ND goes divide-by-10 each number, where stops goes difide-by-2 each number ..... like, ND2=10% pass, ND3=1% pass, and so on, where 1-stop = 50% pass, 2-stop =25% pass, and so on)

But, as far as i know, any decent ND filter is absorption type ..... the reflection of the faces are, as any other polished optics, almost impossible to avoid (can be AR coated, but a minimum of reflection can be always seen)

Or are you speaking about reflective beam dividers ? (that are mirrors that, at 45 degrees, pass 50% straight and reflect 50%)
__________________
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 08-22-2010, 11:23 AM #3
Zike's Avatar
Member
 
Join Date: Jun 2010
Posts: 31
Rep Power: 0
Zike has a spectacular aura aboutZike has a spectacular aura about
Zike Zike is offline
Member
Zike's Avatar
 
Join Date: Jun 2010
Posts: 31
Rep Power: 0
Zike has a spectacular aura aboutZike has a spectacular aura about
Default Re: Absorptive ND2 filter

I will tell you what I'm looking for, it will be easier

I would like to divide the power of a laser (any wavelength) by 2 to be able to measure ~1.5W laser on a 1W limited LPM.

That's is why I'm looking for an accurate (as much as possible) absorptive filter.

As far as I read a ND2 filter has a 50% transmittance (so it only lets 50% of the light pass through).

I bought this ND2 filter here: Ebay ND2 Glass Filter

Unfortunately it has a big reflection, when I point a laser through it the reflected beam/dot is strong. (whatever the angle of the filter is)

Are you aware of a place where could get a filter to achieve what I want to do ?
Zike is offline   Reply With Quote
Old 08-22-2010, 01:51 PM #4
bobhaha's Avatar
Class 3B Laser
 
Join Date: May 2009
Location: Sydney, Australia
Posts: 3,256
Rep Power: 360
bobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond repute
bobhaha bobhaha is offline
Class 3B Laser
bobhaha's Avatar
 
Join Date: May 2009
Location: Sydney, Australia
Posts: 3,256
Rep Power: 360
bobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond reputebobhaha has a reputation beyond repute
Default Re: Absorptive ND2 filter

You could try to contact Lasersbee, I know I have asked a while ago about filters to use with my laserbee I, and he said he used a special type in his shop. That would be your best bet.

-Adrian
__________________
Lasers!
10.6um - >40W CO2 Laser - 25W RF excited CO2 Laser*
685nm - Being built!
660nm - 250mW LOC PowerLight B50 Host - 100mW WL pulsar
635nm - 430mW C6 Host*
632.8nm - Red He-Ne laser ~1mW
593.5nm - Regal 5
542.8nm - Green He-Ne laser ~2.5mW
532nm - 620mW+ lasersman Firedragon III* - 100mW PGL-III-M from JETLASERS* - 70mW Rayfoss Host*
~~~ - 175mW Rayfoss Host - <5mW WL Core - 55mW DinoDirect review laser*

488nm - On the hoist
473nm - 2x CNI lab lasers ~40mW
445nm - 3W Big Boyz Laser - >1.1W Cree C6 Host - 650mW WL Arctic
405nm - 65mW GLP-405 Aquarius host - 160mW 6x Blu-ray MXDL Host
Total: 71,868.5 mW

Goggles!
Laser glow LSG-532-Sport protective eye goggles OD 7+ 190-532nm HIGHLY RECOMMENDED!!
Jetlasers wrap around 190-540nm OD4+ goggles*
Eagle Pair Red OD4+ goggles
Scopeguy20 Blublockers for 405nm lasers!

* indicates a review has been done, on this item.

Check out my How to Build a Selectable Dummy Load Thread!
bobhaha is offline   Reply With Quote
Old 08-22-2010, 02:03 PM #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
Wink Re: Absorptive ND2 filter

LOL, some of these sellers don't know what they write, on their auctions (look the "fader" rated for "ND2 to ND400" rotfl)

Anyway, yes, this one looks as a normal "1 stop" 50% uncoated neutral gray filter ..... but, as far as you find someone that make a broadband AR coating, there's no way for eliminate the reflection, cause usually these filters are NOT AR coated (still takes away 50% of the light, so is probably good, also if i don't know the optical curve of them)

For find better filters, you need to ask optic labs or specialized manufacturers, but this means higher costs (a lot higher ..... look at these ones, just for have an example ..... and Thorlabs are not the ones with the highest costs .....)

..... by the way, a 50% transmission, in the ND scale, is ND0,3 ..... ND1 is a 10% transmission, and ND2 is 1% transmission
__________________
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





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 10:25 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