Doubts about optical filters...

[Externet]

Hi.

Is it called the same in the filter industry: 'filter' ; and there is need to specify blocking or passing for a particular wavelength ?

 

Example; am after a filter that will not pass wavelenght of 450nm and lower. Should I say 450nm and lower wavelenght blocking filter, or 450nm and above wavelenght passing filter ?

 

Are Wratten filters waterproof ? If I choose a Wratten #4, does it mean it will be gelatin or should I specify glass ? If glass, does it mean there is a layer on its surface, or the glass material itself is dyed-embedded with the filtering properties ?

 

Are Wratten filters useable, better or worse to make laser blocking protection goggles ?

 

Is it possible to merge in the same beam, a red laser and a violet laser by use of a prism or something ?

[StringJunky]

Short pass filter lets wavelengths through above specified cutoff wavelength. Long pass filter lets those through below that specified. I think you want a 'short pass 450nm optical filter' if you want to Google it.

 

Here's a place selling safety goggles you might pick up useful info from.

 

http://www.lasermet.com/laser-protective-eyewear.php

 

http://www.lasermet.com/acatalog/LM_Polycarbonate_Range.html

 

Wratten is just a colour density scale system used by photo firms.

 

Here's a firm doing specific band pass filters:

 

http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=918

Edited March 4, 2015 by StringJunky

[Externet]

Thanks, StringJunky.

The links provided are mostly for passing specific wavelengths/bands, as far as my poor understanding.

 

I bought chinese goggles once and were shit. So I want to learn first the (standing) questions on the original post, and then try good stuff or make my own inspection window that will fully block 350nm to 450nm and let pass 500nm to 800nm, for a laser that is composed of high power violet and low power red merged beams, to be able to aim/see a target with low power red and block high power violet.

 

A little better seems to be picking 6. "2E" at the left column, shows the response, at

----> http://www.newportglass.com/kdkcat.htm

[Klaynos]

You a get band stop or notch filters that take out a given range of frequencies. I've used Edmund optics and Thor labs in the past. Waterproofness will depend on specific filter type and situation.

[StringJunky]

That list is scrollable on the right side of the Thorlabs link, I just noticed, and shows the products Klaynos mentions.

[Klaynos]

Thor labs used to always send food with their deliveries. But their website was always a little annoying to use.

[swansont]

"Cutoff filter" is another term you might look for. As mentioned, Edmund and Thor labs sell components like this (Thor labs is lighter on the pure optics), among others. Newport (similar offerings to Thor labs).

 

 

 

Thor labs used to always send food with their deliveries.

 

Apparently Newport is doing that now, too.

[Externet]

Thanks, gentlemen.

From Thorlabs, seems this should work similar as the mentioned Newport.

 

 

About Wratten... Would they work for laser blocking ?

 

About not letting a wavelenght to pass trough... Is it reflected or absorbed into heat by the filter, or there is both types ?

Edited March 4, 2015 by Externet