Reliable OD Calculator?

[LesPaul]

Hello,
I have been looking around for a relible OD calculator, however I have found that calculators differ for example the calculator on this page is much different to the calculator here.

Does anybody know which one gives the right answer or any other calculator that gives a proper answer?

I'd probably go with the second calculator to be safe, but I just want to know in general!

Thanks!

 

[Bluefan]

I always take this: log(P_laser/100uW) as starting point, but higher is usually not a problem. 532nm and shorter has enough flourescence that any high enough OD already works.

 

[LesPaul]

I always take this: log(P_laser/100uW) as starting point, but higher is usually not a problem. 532nm and shorter has enough flourescence that any high enough OD already works.

So what would you say a 1W 445nm laser would need regarding the OD level?

 

[Bluefan]

I'd say 4 or higher, higher OD's won't be a problem because the fluorescence gives away where the dot is.

 

[LesPaul]

I'd say 4 or higher, higher OD's won't be a problem because the fluorescence gives away where the dot is.

Okay thanks. The goggles that I have coming are only OD 2.5 at 445nm and OD 2.7 at 532nm...they are Radiantshades.

 

[Bionic-Badger]

Whenever I need to see if OD is sufficient, I just type in "Input * 10^-OD" into google and see if the result is it is below 0.005. For example, if I want to see if OD 3.7 would protect against 1.5W:

1.5 * 10^-3.7 = 0.000299289347 --> which is less than 0.005 = protected

 

[LesPaul]

Whenever I need to see if OD is sufficient, I just type in "Input * 10^-OD" into google and see if the result is it is below 0.005. For example, if I want to see if OD 3.7 would protect against 1.5W:

1.5 * 10^-3.7 = 0.000299289347 --> which is less than 0.005 = protected

Thanks heaps!